Add CreatePayment and CompletePayment (#229)

Co-authored-by: Marco Argentieri <tiero@users.noreply.github.com>

* Add claim command

* Persist pending data in sqlite repo

* Remove debug log

* Return pending data at interface level

* Fix unlocking btc wallet after restart

* Lint & Fix whitelist permissions

* Fix send command for covenant

* Update client/covenantless/claim.go

Signed-off-by: Marco Argentieri <3596602+tiero@users.noreply.github.com>

* Fix

* Pay for min relay fee instead of estimating fees for redeem and unconf forfeit txs

* Add support for pending payments (coventanless)

* Fixes

* Fixes

* Improve verbosity

* Fix coin selection

* Fix

---------

Signed-off-by: Marco Argentieri <3596602+tiero@users.noreply.github.com>
Co-authored-by: louisinger <louis@vulpem.com>
Co-authored-by: Marco Argentieri <tiero@users.noreply.github.com>
Co-authored-by: Marco Argentieri <3596602+tiero@users.noreply.github.com>

client/covenant/cli.go

@@ -25,6 +25,14 @@ const dust = 450
 
 type covenantLiquidCLI struct{}
 
+func (c *covenantLiquidCLI) SendAsync(ctx *cli.Context) error {
+	return fmt.Errorf("not implemented")
+}
+
+func (c *covenantLiquidCLI) ClaimAsync(ctx *cli.Context) error {
+	return fmt.Errorf("not implemented")
+}
+
 func (c *covenantLiquidCLI) Receive(ctx *cli.Context) error {
 	offchainAddr, onchainAddr, _, err := getAddress(ctx)
 	if err != nil {

client/covenant/client.go

@@ -109,7 +109,7 @@ func getClient(addr string) (arkv1.ArkServiceClient, func(), error) {
 	if !strings.Contains(addr, ":") {
 		addr = fmt.Sprintf("%s:%d", addr, port)
 	}
-	conn, err := grpc.Dial(addr, grpc.WithTransportCredentials(creds))
+	conn, err := grpc.NewClient(addr, grpc.WithTransportCredentials(creds))
 	if err != nil {
 		return nil, nil, err
 	}

client/covenantless/claim.go

@@ -0,0 +1,98 @@
+package covenantless
+
+import (
+	"github.com/ark-network/ark-cli/utils"
+	arkv1 "github.com/ark-network/ark/api-spec/protobuf/gen/ark/v1"
+	"github.com/urfave/cli/v2"
+)
+
+func (c *clArkBitcoinCLI) ClaimAsync(ctx *cli.Context) error {
+	client, cancel, err := getClientFromState(ctx)
+	if err != nil {
+		return err
+	}
+	defer cancel()
+
+	myselfOffchain, _, _, err := getAddress(ctx)
+	if err != nil {
+		return err
+	}
+
+	vtxos, err := getVtxos(ctx, nil, client, myselfOffchain, false)
+	if err != nil {
+		return err
+	}
+
+	var pendingBalance uint64
+	var pendingVtxos []vtxo
+	for _, vtxo := range vtxos {
+		if vtxo.pending {
+			pendingBalance += vtxo.amount
+			pendingVtxos = append(pendingVtxos, vtxo)
+		}
+	}
+	if pendingBalance == 0 {
+		return nil
+	}
+
+	receiver := receiver{
+		To:     myselfOffchain,
+		Amount: pendingBalance,
+	}
+	return selfTransferAllPendingPayments(
+		ctx, client, pendingVtxos, receiver,
+	)
+}
+
+func selfTransferAllPendingPayments(
+	ctx *cli.Context, client arkv1.ArkServiceClient,
+	pendingVtxos []vtxo, myself receiver,
+) error {
+	inputs := make([]*arkv1.Input, 0, len(pendingVtxos))
+
+	for _, coin := range pendingVtxos {
+		inputs = append(inputs, &arkv1.Input{
+			Txid: coin.txid,
+			Vout: coin.vout,
+		})
+	}
+
+	receiversOutput := []*arkv1.Output{
+		{
+			Address: myself.To,
+			Amount:  myself.Amount,
+		},
+	}
+
+	secKey, err := utils.PrivateKeyFromPassword(ctx)
+	if err != nil {
+		return err
+	}
+
+	registerResponse, err := client.RegisterPayment(
+		ctx.Context, &arkv1.RegisterPaymentRequest{Inputs: inputs},
+	)
+	if err != nil {
+		return err
+	}
+
+	_, err = client.ClaimPayment(ctx.Context, &arkv1.ClaimPaymentRequest{
+		Id:      registerResponse.GetId(),
+		Outputs: []*arkv1.Output{{Address: myself.To, Amount: myself.Amount}},
+	})
+	if err != nil {
+		return err
+	}
+
+	poolTxID, err := handleRoundStream(
+		ctx, client, registerResponse.GetId(),
+		pendingVtxos, secKey, receiversOutput,
+	)
+	if err != nil {
+		return err
+	}
+
+	return utils.PrintJSON(map[string]interface{}{
+		"pool_txid": poolTxID,
+	})
+}

client/covenantless/cli.go

@@ -70,15 +70,19 @@ func New() interfaces.CLI {
 	return &clArkBitcoinCLI{}
 }
 
+func (c *clArkBitcoinCLI) Send(ctx *cli.Context) error {
+	return fmt.Errorf("not implemented")
+}
+
 type receiver struct {
 	To     string `json:"to"`
 	Amount uint64 `json:"amount"`
 }
 
-func (r *receiver) isOnchain() bool {
-	_, err := btcutil.DecodeAddress(r.To, nil)
-	return err == nil
-}
+// func (r *receiver) isOnchain() bool {
+// 	_, err := btcutil.DecodeAddress(r.To, nil)
+// 	return err == nil
+// }
 
 func sendOnchain(ctx *cli.Context, receivers []receiver) (string, error) {
 	ptx, err := psbt.New(nil, nil, 2, 0, nil)

client/covenantless/client.go

@@ -27,6 +27,7 @@ type vtxo struct {
 	vout     uint32
 	poolTxid string
 	expireAt *time.Time
+	pending  bool
 }
 
 func getVtxos(
@@ -43,19 +44,20 @@ func getVtxos(
 	vtxos := make([]vtxo, 0, len(response.GetSpendableVtxos()))
 	for _, v := range response.GetSpendableVtxos() {
 		var expireAt *time.Time
-		if v.ExpireAt > 0 {
+		if v.GetExpireAt() > 0 {
 			t := time.Unix(v.ExpireAt, 0)
 			expireAt = &t
 		}
-		if v.Swept {
+		if v.GetSwept() {
 			continue
 		}
 		vtxos = append(vtxos, vtxo{
-			amount:   v.Receiver.Amount,
-			txid:     v.Outpoint.Txid,
-			vout:     v.Outpoint.Vout,
-			poolTxid: v.PoolTxid,
+			amount:   v.GetReceiver().GetAmount(),
+			txid:     v.GetOutpoint().GetTxid(),
+			vout:     v.GetOutpoint().GetVout(),
+			poolTxid: v.GetPoolTxid(),
 			expireAt: expireAt,
+			pending:  v.GetPending(),
 		})
 	}
 
@@ -108,7 +110,7 @@ func getClient(addr string) (arkv1.ArkServiceClient, func(), error) {
 	if !strings.Contains(addr, ":") {
 		addr = fmt.Sprintf("%s:%d", addr, port)
 	}
-	conn, err := grpc.Dial(addr, grpc.WithTransportCredentials(creds))
+	conn, err := grpc.NewClient(addr, grpc.WithTransportCredentials(creds))
 	if err != nil {
 		return nil, nil, err
 	}

client/covenantless/send.go

@@ -2,118 +2,63 @@ package covenantless
 
 import (
 	"bytes"
-	"encoding/json"
 	"fmt"
 	"sort"
+	"strings"
 
 	"github.com/ark-network/ark-cli/utils"
 	arkv1 "github.com/ark-network/ark/api-spec/protobuf/gen/ark/v1"
 	"github.com/ark-network/ark/common"
+	"github.com/btcsuite/btcd/btcutil/psbt"
 	"github.com/urfave/cli/v2"
 )
 
-func (c *clArkBitcoinCLI) Send(ctx *cli.Context) error {
-	if !ctx.IsSet("receivers") && !ctx.IsSet("to") && !ctx.IsSet("amount") {
-		return fmt.Errorf("missing destination, either use --to and --amount to send or --receivers to send to many")
-	}
-	receivers := ctx.String("receivers")
-	to := ctx.String("to")
+func (c *clArkBitcoinCLI) SendAsync(ctx *cli.Context) error {
+	receiver := ctx.String("to")
 	amount := ctx.Uint64("amount")
-
-	var receiversJSON []receiver
-	if len(receivers) > 0 {
-		if err := json.Unmarshal([]byte(receivers), &receiversJSON); err != nil {
-			return fmt.Errorf("invalid receivers: %s", err)
-		}
-	} else {
-		receiversJSON = []receiver{
-			{
-				To:     to,
-				Amount: amount,
-			},
-		}
-	}
-
-	if len(receiversJSON) <= 0 {
-		return fmt.Errorf("no receivers specified")
-	}
-
-	onchainReceivers := make([]receiver, 0)
-	offchainReceivers := make([]receiver, 0)
-
-	for _, receiver := range receiversJSON {
-		if receiver.isOnchain() {
-			onchainReceivers = append(onchainReceivers, receiver)
-		} else {
-			offchainReceivers = append(offchainReceivers, receiver)
-		}
-	}
-
-	explorer := utils.NewExplorer(ctx)
-
-	if len(onchainReceivers) > 0 {
-		pset, err := sendOnchain(ctx, onchainReceivers)
-		if err != nil {
-			return err
-		}
-
-		txid, err := explorer.Broadcast(pset)
-		if err != nil {
-			return err
-		}
-
-		return utils.PrintJSON(map[string]interface{}{
-			"txid": txid,
-		})
-	}
-
-	if len(offchainReceivers) > 0 {
-		if err := sendOffchain(ctx, offchainReceivers); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-func sendOffchain(ctx *cli.Context, receivers []receiver) error {
 	withExpiryCoinselect := ctx.Bool("enable-expiry-coinselect")
 
+	if amount < dust {
+		return fmt.Errorf("invalid amount (%d), must be greater than dust %d", amount, dust)
+	}
+
+	if receiver == "" {
+		return fmt.Errorf("receiver address is required")
+	}
+	isOnchain, _, _, err := decodeReceiverAddress(receiver)
+	if err != nil {
+		return err
+	}
+	if isOnchain {
+		return fmt.Errorf("receiver address is onchain")
+	}
+
 	offchainAddr, _, _, err := getAddress(ctx)
 	if err != nil {
 		return err
 	}
-
 	_, _, aspPubKey, err := common.DecodeAddress(offchainAddr)
 	if err != nil {
 		return err
 	}
+	_, _, aspKey, err := common.DecodeAddress(receiver)
+	if err != nil {
+		return fmt.Errorf("invalid receiver address: %s", err)
+	}
+	if !bytes.Equal(
+		aspPubKey.SerializeCompressed(), aspKey.SerializeCompressed(),
+	) {
+		return fmt.Errorf("invalid receiver address '%s': must be associated with the connected service provider", receiver)
+	}
 
 	receiversOutput := make([]*arkv1.Output, 0)
 	sumOfReceivers := uint64(0)
+	receiversOutput = append(receiversOutput, &arkv1.Output{
+		Address: receiver,
+		Amount:  amount,
+	})
+	sumOfReceivers += amount
 
-	for _, receiver := range receivers {
-		_, _, aspKey, err := common.DecodeAddress(receiver.To)
-		if err != nil {
-			return fmt.Errorf("invalid receiver address: %s", err)
-		}
-
-		if !bytes.Equal(
-			aspPubKey.SerializeCompressed(), aspKey.SerializeCompressed(),
-		) {
-			return fmt.Errorf("invalid receiver address '%s': must be associated with the connected service provider", receiver.To)
-		}
-
-		if receiver.Amount < dust {
-			return fmt.Errorf("invalid amount (%d), must be greater than dust %d", receiver.Amount, dust)
-		}
-
-		receiversOutput = append(receiversOutput, &arkv1.Output{
-			Address: receiver.To,
-			Amount:  uint64(receiver.Amount),
-		})
-		sumOfReceivers += receiver.Amount
-	}
 	client, close, err := getClientFromState(ctx)
 	if err != nil {
 		return err
@@ -148,37 +93,66 @@ func sendOffchain(ctx *cli.Context, receivers []receiver) error {
 		})
 	}
 
-	secKey, err := utils.PrivateKeyFromPassword(ctx)
+	resp, err := client.CreatePayment(
+		ctx.Context, &arkv1.CreatePaymentRequest{
+			Inputs:  inputs,
+			Outputs: receiversOutput,
+		})
 	if err != nil {
 		return err
 	}
 
-	registerResponse, err := client.RegisterPayment(
-		ctx.Context, &arkv1.RegisterPaymentRequest{Inputs: inputs},
-	)
+	// TODO verify the redeem tx signature
+	fmt.Println("payment created")
+	fmt.Println("signing redeem and forfeit txs...")
+
+	seckey, err := utils.PrivateKeyFromPassword(ctx)
 	if err != nil {
 		return err
 	}
 
-	_, err = client.ClaimPayment(ctx.Context, &arkv1.ClaimPaymentRequest{
-		Id:      registerResponse.GetId(),
-		Outputs: receiversOutput,
-	})
+	signedUnconditionalForfeitTxs := make([]string, 0, len(resp.UsignedUnconditionalForfeitTxs))
+	for _, tx := range resp.UsignedUnconditionalForfeitTxs {
+		forfeitPtx, err := psbt.NewFromRawBytes(strings.NewReader(tx), true)
+		if err != nil {
+			return err
+		}
+
+		if err := signPsbt(ctx, forfeitPtx, explorer, seckey); err != nil {
+			return err
+		}
+
+		signedForfeitTx, err := forfeitPtx.B64Encode()
+		if err != nil {
+			return err
+		}
+
+		signedUnconditionalForfeitTxs = append(signedUnconditionalForfeitTxs, signedForfeitTx)
+	}
+
+	redeemPtx, err := psbt.NewFromRawBytes(strings.NewReader(resp.SignedRedeemTx), true)
 	if err != nil {
 		return err
 	}
 
-	poolTxID, err := handleRoundStream(
-		ctx, client, registerResponse.GetId(),
-		selectedCoins, secKey, receiversOutput,
-	)
+	if err := signPsbt(ctx, redeemPtx, explorer, seckey); err != nil {
+		return err
+	}
+
+	signedRedeem, err := redeemPtx.B64Encode()
 	if err != nil {
 		return err
 	}
 
-	return utils.PrintJSON(map[string]interface{}{
-		"pool_txid": poolTxID,
-	})
+	if _, err = client.CompletePayment(ctx.Context, &arkv1.CompletePaymentRequest{
+		SignedRedeemTx:                signedRedeem,
+		SignedUnconditionalForfeitTxs: signedUnconditionalForfeitTxs,
+	}); err != nil {
+		return err
+	}
+
+	fmt.Println("payment completed")
+	return nil
 }
 
 func coinSelect(vtxos []vtxo, amount uint64, sortByExpirationTime bool) ([]vtxo, uint64, error) {
@@ -213,7 +187,7 @@ func coinSelect(vtxos []vtxo, amount uint64, sortByExpirationTime bool) ([]vtxo,
 
 	change := selectedAmount - amount
 
-	if change < dust {
+	if change > 0 && change < dust {
 		if len(notSelected) > 0 {
 			selected = append(selected, notSelected[0])
 			change += notSelected[0].amount

client/covenantless/signer.go

@@ -132,7 +132,7 @@ func signPsbt(
 				switch c := closure.(type) {
 				case *bitcointree.CSVSigClosure:
 					sign = bytes.Equal(c.Pubkey.SerializeCompressed()[1:], pubkey.SerializeCompressed()[1:])
-				case *bitcointree.ForfeitClosure:
+				case *bitcointree.MultisigClosure:
 					sign = bytes.Equal(c.Pubkey.SerializeCompressed()[1:], pubkey.SerializeCompressed()[1:])
 				}
 

client/covenantless/vtxo.go

@@ -14,7 +14,7 @@ func computeVtxoTaprootScript(
 		Seconds: exitDelay,
 	}
 
-	forfeitClosure := &bitcointree.ForfeitClosure{
+	forfeitClosure := &bitcointree.MultisigClosure{
 		Pubkey:    userPubkey,
 		AspPubkey: aspPubkey,
 	}

client/flags/flags.go

@@ -72,18 +72,22 @@ var (
 		Value:    "",
 		Required: false,
 	}
-
 	AmountToRedeemFlag = cli.Uint64Flag{
 		Name:     "amount",
 		Usage:    "amount to redeem",
 		Value:    0,
 		Required: false,
 	}
-
 	ForceFlag = cli.BoolFlag{
 		Name:     "force",
 		Usage:    "force redemption without collaborate with the Ark service provider",
 		Value:    false,
 		Required: false,
 	}
+	AsyncPaymentFlag = cli.BoolFlag{
+		Name:     "async",
+		Usage:    "use async payment protocol",
+		Value:    false,
+		Required: false,
+	}
 )

client/interfaces/cli.go

@@ -8,5 +8,7 @@ type CLI interface {
 	Receive(ctx *cli.Context) error
 	Redeem(ctx *cli.Context) error
 	Send(ctx *cli.Context) error
+	ClaimAsync(ctx *cli.Context) error
+	SendAsync(ctx *cli.Context) error
 	Onboard(ctx *cli.Context) error
 }

client/main.go

@@ -92,14 +92,36 @@ var (
 	sendCommand = cli.Command{
 		Name:  "send",
 		Usage: "Send your onchain or offchain funds to one or many receivers",
+		Action: func(ctx *cli.Context) error {
+			state, err := utils.GetState(ctx)
+			if err != nil {
+				return err
+			}
+
+			networkName := state[utils.NETWORK]
+			cli, err := getCLI(networkName)
+			if err != nil {
+				return err
+			}
+			if strings.Contains(networkName, "liquid") {
+				return cli.Send(ctx)
+			}
+			return cli.SendAsync(ctx)
+		},
+		Flags: []cli.Flag{&flags.ReceiversFlag, &flags.ToFlag, &flags.AmountFlag, &flags.PasswordFlag, &flags.EnableExpiryCoinselectFlag, &flags.AsyncPaymentFlag},
+	}
+
+	claimCommand = cli.Command{
+		Name:  "claim",
+		Usage: "Join round to claim pending payments",
 		Action: func(ctx *cli.Context) error {
 			cli, err := getCLIFromState(ctx)
 			if err != nil {
 				return err
 			}
-			return cli.Send(ctx)
+			return cli.ClaimAsync(ctx)
 		},
-		Flags: []cli.Flag{&flags.ReceiversFlag, &flags.ToFlag, &flags.AmountFlag, &flags.PasswordFlag, &flags.EnableExpiryCoinselectFlag},
+		Flags: []cli.Flag{&flags.PasswordFlag},
 	}
 
 	receiveCommand = cli.Command{
@@ -144,6 +166,7 @@ func main() {
 		&receiveCommand,
 		&redeemCommand,
 		&sendCommand,
+		&claimCommand,
 		&onboardCommand,
 	)
 	app.Flags = []cli.Flag{

client/utils/explorer.go

@@ -84,7 +84,6 @@ func (e *explorer) GetFeeRate() (float64, error) {
 		fmt.Println("empty fee-estimates response, default to 2 sat/vbyte")
 		return 2, nil
 	}
-	fmt.Println("fee rate", response["1"])
 
 	return response["1"], nil
 }

common/bitcointree/builder.go

@@ -155,7 +155,7 @@ func (l *leaf) getOutputs() ([]*wire.TxOut, error) {
 		return nil, err
 	}
 
-	forfeitClosure := &ForfeitClosure{
+	forfeitClosure := &MultisigClosure{
 		Pubkey:    l.vtxoKey,
 		AspPubkey: l.aspKey,
 	}

common/bitcointree/script.go

@@ -20,7 +20,7 @@ type CSVSigClosure struct {
 	Seconds uint
 }
 
-type ForfeitClosure struct {
+type MultisigClosure struct {
 	Pubkey    *secp256k1.PublicKey
 	AspPubkey *secp256k1.PublicKey
 }
@@ -33,7 +33,7 @@ func DecodeClosure(script []byte) (Closure, error) {
 		return closure, nil
 	}
 
-	closure = &ForfeitClosure{}
+	closure = &MultisigClosure{}
 	if valid, err := closure.Decode(script); err == nil && valid {
 		return closure, nil
 	}
@@ -42,7 +42,7 @@ func DecodeClosure(script []byte) (Closure, error) {
 
 }
 
-func (f *ForfeitClosure) Leaf() (*txscript.TapLeaf, error) {
+func (f *MultisigClosure) Leaf() (*txscript.TapLeaf, error) {
 	aspKeyBytes := schnorr.SerializePubKey(f.AspPubkey)
 	userKeyBytes := schnorr.SerializePubKey(f.Pubkey)
 
@@ -57,7 +57,7 @@ func (f *ForfeitClosure) Leaf() (*txscript.TapLeaf, error) {
 	return &tapLeaf, nil
 }
 
-func (f *ForfeitClosure) Decode(script []byte) (bool, error) {
+func (f *MultisigClosure) Decode(script []byte) (bool, error) {
 	valid, aspPubKey, err := decodeChecksigScript(script)
 	if err != nil {
 		return false, err
@@ -149,7 +149,7 @@ func ComputeVtxoTaprootScript(
 		Seconds: exitDelay,
 	}
 
-	forfeitClosure := &ForfeitClosure{
+	forfeitClosure := &MultisigClosure{
 		Pubkey:    userPubkey,
 		AspPubkey: aspPubkey,
 	}

docker-compose.clark.regtest.yml

@@ -18,6 +18,9 @@ services:
       - ARK_NO_MACAROONS=true
     ports:
       - "6000:6000"
+    volumes:
+      - clarkd:/app/data
+      - clark:/app/wallet-data
 
 volumes:
   clarkd:

docker-compose.regtest.yml

@@ -14,6 +14,9 @@ services:
       - OCEAN_DB_TYPE=badger
     ports:
       - "18000:18000"
+    volumes:
+      - oceand:/app/data/oceand
+      - ocean:/app/data/ocean
   arkd:
     container_name: arkd
     build: 
@@ -35,6 +38,9 @@ services:
       - ARK_NO_MACAROONS=true
     ports:
       - "8080:8080"
+    volumes:
+      - arkd:/app/data
+      - ark:/app/wallet-data
 
 volumes:
   oceand:

pkg/client-sdk/ark_sdk.go

@@ -23,6 +23,8 @@ type ArkClient interface {
 	CollaborativeRedeem(
 		ctx context.Context, addr string, amount uint64, withExpiryCoinselect bool,
 	) (string, error)
+	SendAsync(ctx context.Context, withExpiryCoinselect bool, receivers []Receiver) (string, error)
+	ClaimAsync(ctx context.Context) (string, error)
 }
 
 type Receiver interface {

pkg/client-sdk/client/client.go

@@ -37,6 +37,12 @@ type ASPClient interface {
 	FinalizePayment(
 		ctx context.Context, signedForfeitTxs []string,
 	) error
+	CreatePayment(
+		ctx context.Context, inputs []VtxoKey, outputs []Output,
+	) (string, []string, error)
+	CompletePayment(
+		ctx context.Context, signedRedeemTx string, signedUnconditionalForfeitTxs []string,
+	) error
 	Close()
 }
 
@@ -61,9 +67,12 @@ type VtxoKey struct {
 
 type Vtxo struct {
 	VtxoKey
-	Amount    uint64
-	RoundTxid string
-	ExpiresAt *time.Time
+	Amount                  uint64
+	RoundTxid               string
+	ExpiresAt               *time.Time
+	RedeemTx                string
+	UnconditionalForfeitTxs []string
+	Pending                 bool
 }
 
 type Output struct {

pkg/client-sdk/client/grpc/client.go

@@ -199,6 +199,31 @@ func (a *grpcClient) FinalizePayment(
 	return err
 }
 
+func (a *grpcClient) CreatePayment(
+	ctx context.Context, inputs []client.VtxoKey, outputs []client.Output,
+) (string, []string, error) {
+	req := &arkv1.CreatePaymentRequest{
+		Inputs:  ins(inputs).toProto(),
+		Outputs: outs(outputs).toProto(),
+	}
+	resp, err := a.svc.CreatePayment(ctx, req)
+	if err != nil {
+		return "", nil, err
+	}
+	return resp.SignedRedeemTx, resp.UsignedUnconditionalForfeitTxs, nil
+}
+
+func (a *grpcClient) CompletePayment(
+	ctx context.Context, redeemTx string, signedForfeitTxs []string,
+) error {
+	req := &arkv1.CompletePaymentRequest{
+		SignedRedeemTx:                redeemTx,
+		SignedUnconditionalForfeitTxs: signedForfeitTxs,
+	}
+	_, err := a.svc.CompletePayment(ctx, req)
+	return err
+}
+
 func (a *grpcClient) GetRoundByID(
 	ctx context.Context, roundID string,
 ) (*client.Round, error) {
@@ -284,14 +309,23 @@ func (v vtxo) toVtxo() client.Vtxo {
 		t := time.Unix(v.GetExpireAt(), 0)
 		expiresAt = &t
 	}
+	var redeemTx string
+	var uncondForfeitTxs []string
+	if v.GetPendingData() != nil {
+		redeemTx = v.GetPendingData().GetRedeemTx()
+		uncondForfeitTxs = v.GetPendingData().GetUnconditionalForfeitTxs()
+	}
 	return client.Vtxo{
 		VtxoKey: client.VtxoKey{
 			Txid: v.GetOutpoint().GetTxid(),
 			VOut: v.GetOutpoint().GetVout(),
 		},
-		Amount:    v.GetReceiver().GetAmount(),
-		RoundTxid: v.GetPoolTxid(),
-		ExpiresAt: expiresAt,
+		Amount:                  v.GetReceiver().GetAmount(),
+		RoundTxid:               v.GetPoolTxid(),
+		ExpiresAt:               expiresAt,
+		Pending:                 v.GetPending(),
+		RedeemTx:                redeemTx,
+		UnconditionalForfeitTxs: uncondForfeitTxs,
 	}
 }
 

pkg/client-sdk/client/rest/client.go

@@ -180,14 +180,24 @@ func (a *restClient) ListVtxos(
 			return nil, nil, err
 		}
 
+		var redeemTx string
+		var uncondForfeitTxs []string
+		if v.PendingData != nil {
+			redeemTx = v.PendingData.RedeemTx
+			uncondForfeitTxs = v.PendingData.UnconditionalForfeitTxs
+		}
+
 		spendableVtxos = append(spendableVtxos, client.Vtxo{
 			VtxoKey: client.VtxoKey{
 				Txid: v.Outpoint.Txid,
 				VOut: uint32(v.Outpoint.Vout),
 			},
-			Amount:    uint64(amount),
-			RoundTxid: v.PoolTxid,
-			ExpiresAt: expiresAt,
+			Amount:                  uint64(amount),
+			RoundTxid:               v.PoolTxid,
+			ExpiresAt:               expiresAt,
+			Pending:                 v.Pending,
+			RedeemTx:                redeemTx,
+			UnconditionalForfeitTxs: uncondForfeitTxs,
 		})
 	}
 
@@ -358,6 +368,53 @@ func (a *restClient) FinalizePayment(
 	return err
 }
 
+func (a *restClient) CreatePayment(
+	ctx context.Context, inputs []client.VtxoKey, outputs []client.Output,
+) (string, []string, error) {
+	ins := make([]*models.V1Input, 0, len(inputs))
+	for _, i := range inputs {
+		ins = append(ins, &models.V1Input{
+			Txid: i.Txid,
+			Vout: int64(i.VOut),
+		})
+	}
+	outs := make([]*models.V1Output, 0, len(outputs))
+	for _, o := range outputs {
+		outs = append(outs, &models.V1Output{
+			Address: o.Address,
+			Amount:  strconv.Itoa(int(o.Amount)),
+		})
+	}
+	body := models.V1CreatePaymentRequest{
+		Inputs:  ins,
+		Outputs: outs,
+	}
+	resp, err := a.svc.ArkServiceCreatePayment(
+		ark_service.NewArkServiceCreatePaymentParams().WithBody(&body),
+	)
+	if err != nil {
+		return "", nil, err
+	}
+	return resp.GetPayload().SignedRedeemTx, resp.GetPayload().UsignedUnconditionalForfeitTxs, nil
+}
+
+func (a *restClient) CompletePayment(
+	ctx context.Context, signedRedeemTx string, signedUnconditionalForfeitTxs []string,
+) error {
+	req := &arkv1.CompletePaymentRequest{
+		SignedRedeemTx:                signedRedeemTx,
+		SignedUnconditionalForfeitTxs: signedUnconditionalForfeitTxs,
+	}
+	body := models.V1CompletePaymentRequest{
+		SignedRedeemTx:                req.GetSignedRedeemTx(),
+		SignedUnconditionalForfeitTxs: req.GetSignedUnconditionalForfeitTxs(),
+	}
+	_, err := a.svc.ArkServiceCompletePayment(
+		ark_service.NewArkServiceCompletePaymentParams().WithBody(&body),
+	)
+	return err
+}
+
 func (a *restClient) GetRoundByID(
 	ctx context.Context, roundID string,
 ) (*client.Round, error) {

pkg/client-sdk/client/rest/service/arkservice/ark_service/ark_service_client.go

@@ -56,6 +56,10 @@ type ClientOption func(*runtime.ClientOperation)
 type ClientService interface {
 	ArkServiceClaimPayment(params *ArkServiceClaimPaymentParams, opts ...ClientOption) (*ArkServiceClaimPaymentOK, error)
 
+	ArkServiceCompletePayment(params *ArkServiceCompletePaymentParams, opts ...ClientOption) (*ArkServiceCompletePaymentOK, error)
+
+	ArkServiceCreatePayment(params *ArkServiceCreatePaymentParams, opts ...ClientOption) (*ArkServiceCreatePaymentOK, error)
+
 	ArkServiceFinalizePayment(params *ArkServiceFinalizePaymentParams, opts ...ClientOption) (*ArkServiceFinalizePaymentOK, error)
 
 	ArkServiceGetEventStream(params *ArkServiceGetEventStreamParams, opts ...ClientOption) (*ArkServiceGetEventStreamOK, error)
@@ -114,6 +118,80 @@ func (a *Client) ArkServiceClaimPayment(params *ArkServiceClaimPaymentParams, op
 	return nil, runtime.NewAPIError("unexpected success response: content available as default response in error", unexpectedSuccess, unexpectedSuccess.Code())
 }
 
+/*
+ArkServiceCompletePayment ark service complete payment API
+*/
+func (a *Client) ArkServiceCompletePayment(params *ArkServiceCompletePaymentParams, opts ...ClientOption) (*ArkServiceCompletePaymentOK, error) {
+	// TODO: Validate the params before sending
+	if params == nil {
+		params = NewArkServiceCompletePaymentParams()
+	}
+	op := &runtime.ClientOperation{
+		ID:                 "ArkService_CompletePayment",
+		Method:             "POST",
+		PathPattern:        "/v1/payment/complete",
+		ProducesMediaTypes: []string{"application/json"},
+		ConsumesMediaTypes: []string{"application/json"},
+		Schemes:            []string{"http"},
+		Params:             params,
+		Reader:             &ArkServiceCompletePaymentReader{formats: a.formats},
+		Context:            params.Context,
+		Client:             params.HTTPClient,
+	}
+	for _, opt := range opts {
+		opt(op)
+	}
+
+	result, err := a.transport.Submit(op)
+	if err != nil {
+		return nil, err
+	}
+	success, ok := result.(*ArkServiceCompletePaymentOK)
+	if ok {
+		return success, nil
+	}
+	// unexpected success response
+	unexpectedSuccess := result.(*ArkServiceCompletePaymentDefault)
+	return nil, runtime.NewAPIError("unexpected success response: content available as default response in error", unexpectedSuccess, unexpectedSuccess.Code())
+}
+
+/*
+ArkServiceCreatePayment ark service create payment API
+*/
+func (a *Client) ArkServiceCreatePayment(params *ArkServiceCreatePaymentParams, opts ...ClientOption) (*ArkServiceCreatePaymentOK, error) {
+	// TODO: Validate the params before sending
+	if params == nil {
+		params = NewArkServiceCreatePaymentParams()
+	}
+	op := &runtime.ClientOperation{
+		ID:                 "ArkService_CreatePayment",
+		Method:             "POST",
+		PathPattern:        "/v1/payment",
+		ProducesMediaTypes: []string{"application/json"},
+		ConsumesMediaTypes: []string{"application/json"},
+		Schemes:            []string{"http"},
+		Params:             params,
+		Reader:             &ArkServiceCreatePaymentReader{formats: a.formats},
+		Context:            params.Context,
+		Client:             params.HTTPClient,
+	}
+	for _, opt := range opts {
+		opt(op)
+	}
+
+	result, err := a.transport.Submit(op)
+	if err != nil {
+		return nil, err
+	}
+	success, ok := result.(*ArkServiceCreatePaymentOK)
+	if ok {
+		return success, nil
+	}
+	// unexpected success response
+	unexpectedSuccess := result.(*ArkServiceCreatePaymentDefault)
+	return nil, runtime.NewAPIError("unexpected success response: content available as default response in error", unexpectedSuccess, unexpectedSuccess.Code())
+}
+
 /*
 ArkServiceFinalizePayment ark service finalize payment API
 */

pkg/client-sdk/client/rest/service/arkservice/ark_service/ark_service_complete_payment_parameters.go

@@ -0,0 +1,150 @@
+// Code generated by go-swagger; DO NOT EDIT.
+
+package ark_service
+
+// This file was generated by the swagger tool.
+// Editing this file might prove futile when you re-run the swagger generate command
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"github.com/go-openapi/errors"
+	"github.com/go-openapi/runtime"
+	cr "github.com/go-openapi/runtime/client"
+	"github.com/go-openapi/strfmt"
+
+	"github.com/ark-network/ark/pkg/client-sdk/client/rest/service/models"
+)
+
+// NewArkServiceCompletePaymentParams creates a new ArkServiceCompletePaymentParams object,
+// with the default timeout for this client.
+//
+// Default values are not hydrated, since defaults are normally applied by the API server side.
+//
+// To enforce default values in parameter, use SetDefaults or WithDefaults.
+func NewArkServiceCompletePaymentParams() *ArkServiceCompletePaymentParams {
+	return &ArkServiceCompletePaymentParams{
+		timeout: cr.DefaultTimeout,
+	}
+}
+
+// NewArkServiceCompletePaymentParamsWithTimeout creates a new ArkServiceCompletePaymentParams object
+// with the ability to set a timeout on a request.
+func NewArkServiceCompletePaymentParamsWithTimeout(timeout time.Duration) *ArkServiceCompletePaymentParams {
+	return &ArkServiceCompletePaymentParams{
+		timeout: timeout,
+	}
+}
+
+// NewArkServiceCompletePaymentParamsWithContext creates a new ArkServiceCompletePaymentParams object
+// with the ability to set a context for a request.
+func NewArkServiceCompletePaymentParamsWithContext(ctx context.Context) *ArkServiceCompletePaymentParams {
+	return &ArkServiceCompletePaymentParams{
+		Context: ctx,
+	}
+}
+
+// NewArkServiceCompletePaymentParamsWithHTTPClient creates a new ArkServiceCompletePaymentParams object
+// with the ability to set a custom HTTPClient for a request.
+func NewArkServiceCompletePaymentParamsWithHTTPClient(client *http.Client) *ArkServiceCompletePaymentParams {
+	return &ArkServiceCompletePaymentParams{
+		HTTPClient: client,
+	}
+}
+
+/*
+ArkServiceCompletePaymentParams contains all the parameters to send to the API endpoint
+
+	for the ark service complete payment operation.
+
+	Typically these are written to a http.Request.
+*/
+type ArkServiceCompletePaymentParams struct {
+
+	// Body.
+	Body *models.V1CompletePaymentRequest
+
+	timeout    time.Duration
+	Context    context.Context
+	HTTPClient *http.Client
+}
+
+// WithDefaults hydrates default values in the ark service complete payment params (not the query body).
+//
+// All values with no default are reset to their zero value.
+func (o *ArkServiceCompletePaymentParams) WithDefaults() *ArkServiceCompletePaymentParams {
+	o.SetDefaults()
+	return o
+}
+
+// SetDefaults hydrates default values in the ark service complete payment params (not the query body).
+//
+// All values with no default are reset to their zero value.
+func (o *ArkServiceCompletePaymentParams) SetDefaults() {
+	// no default values defined for this parameter
+}
+
+// WithTimeout adds the timeout to the ark service complete payment params
+func (o *ArkServiceCompletePaymentParams) WithTimeout(timeout time.Duration) *ArkServiceCompletePaymentParams {
+	o.SetTimeout(timeout)
+	return o
+}
+
+// SetTimeout adds the timeout to the ark service complete payment params
+func (o *ArkServiceCompletePaymentParams) SetTimeout(timeout time.Duration) {
+	o.timeout = timeout
+}
+
+// WithContext adds the context to the ark service complete payment params
+func (o *ArkServiceCompletePaymentParams) WithContext(ctx context.Context) *ArkServiceCompletePaymentParams {
+	o.SetContext(ctx)
+	return o
+}
+
+// SetContext adds the context to the ark service complete payment params
+func (o *ArkServiceCompletePaymentParams) SetContext(ctx context.Context) {
+	o.Context = ctx
+}
+
+// WithHTTPClient adds the HTTPClient to the ark service complete payment params
+func (o *ArkServiceCompletePaymentParams) WithHTTPClient(client *http.Client) *ArkServiceCompletePaymentParams {
+	o.SetHTTPClient(client)
+	return o
+}
+
+// SetHTTPClient adds the HTTPClient to the ark service complete payment params
+func (o *ArkServiceCompletePaymentParams) SetHTTPClient(client *http.Client) {
+	o.HTTPClient = client
+}
+
+// WithBody adds the body to the ark service complete payment params
+func (o *ArkServiceCompletePaymentParams) WithBody(body *models.V1CompletePaymentRequest) *ArkServiceCompletePaymentParams {
+	o.SetBody(body)
+	return o
+}
+
+// SetBody adds the body to the ark service complete payment params
+func (o *ArkServiceCompletePaymentParams) SetBody(body *models.V1CompletePaymentRequest) {
+	o.Body = body
+}
+
+// WriteToRequest writes these params to a swagger request
+func (o *ArkServiceCompletePaymentParams) WriteToRequest(r runtime.ClientRequest, reg strfmt.Registry) error {
+
+	if err := r.SetTimeout(o.timeout); err != nil {
+		return err
+	}
+	var res []error
+	if o.Body != nil {
+		if err := r.SetBodyParam(o.Body); err != nil {
+			return err
+		}
+	}
+
+	if len(res) > 0 {
+		return errors.CompositeValidationError(res...)
+	}
+	return nil
+}

pkg/client-sdk/client/rest/service/arkservice/ark_service/ark_service_complete_payment_responses.go

@@ -0,0 +1,185 @@
+// Code generated by go-swagger; DO NOT EDIT.
+
+package ark_service
+
+// This file was generated by the swagger tool.
+// Editing this file might prove futile when you re-run the swagger generate command
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+
+	"github.com/go-openapi/runtime"
+	"github.com/go-openapi/strfmt"
+
+	"github.com/ark-network/ark/pkg/client-sdk/client/rest/service/models"
+)
+
+// ArkServiceCompletePaymentReader is a Reader for the ArkServiceCompletePayment structure.
+type ArkServiceCompletePaymentReader struct {
+	formats strfmt.Registry
+}
+
+// ReadResponse reads a server response into the received o.
+func (o *ArkServiceCompletePaymentReader) ReadResponse(response runtime.ClientResponse, consumer runtime.Consumer) (interface{}, error) {
+	switch response.Code() {
+	case 200:
+		result := NewArkServiceCompletePaymentOK()
+		if err := result.readResponse(response, consumer, o.formats); err != nil {
+			return nil, err
+		}
+		return result, nil
+	default:
+		result := NewArkServiceCompletePaymentDefault(response.Code())
+		if err := result.readResponse(response, consumer, o.formats); err != nil {
+			return nil, err
+		}
+		if response.Code()/100 == 2 {
+			return result, nil
+		}
+		return nil, result
+	}
+}
+
+// NewArkServiceCompletePaymentOK creates a ArkServiceCompletePaymentOK with default headers values
+func NewArkServiceCompletePaymentOK() *ArkServiceCompletePaymentOK {
+	return &ArkServiceCompletePaymentOK{}
+}
+
+/*
+ArkServiceCompletePaymentOK describes a response with status code 200, with default header values.
+
+A successful response.
+*/
+type ArkServiceCompletePaymentOK struct {
+	Payload models.V1CompletePaymentResponse
+}
+
+// IsSuccess returns true when this ark service complete payment o k response has a 2xx status code
+func (o *ArkServiceCompletePaymentOK) IsSuccess() bool {
+	return true
+}
+
+// IsRedirect returns true when this ark service complete payment o k response has a 3xx status code
+func (o *ArkServiceCompletePaymentOK) IsRedirect() bool {
+	return false
+}
+
+// IsClientError returns true when this ark service complete payment o k response has a 4xx status code
+func (o *ArkServiceCompletePaymentOK) IsClientError() bool {
+	return false
+}
+
+// IsServerError returns true when this ark service complete payment o k response has a 5xx status code
+func (o *ArkServiceCompletePaymentOK) IsServerError() bool {
+	return false
+}
+
+// IsCode returns true when this ark service complete payment o k response a status code equal to that given
+func (o *ArkServiceCompletePaymentOK) IsCode(code int) bool {
+	return code == 200
+}
+
+// Code gets the status code for the ark service complete payment o k response
+func (o *ArkServiceCompletePaymentOK) Code() int {
+	return 200
+}
+
+func (o *ArkServiceCompletePaymentOK) Error() string {
+	payload, _ := json.Marshal(o.Payload)
+	return fmt.Sprintf("[POST /v1/payment/complete][%d] arkServiceCompletePaymentOK %s", 200, payload)
+}
+
+func (o *ArkServiceCompletePaymentOK) String() string {
+	payload, _ := json.Marshal(o.Payload)
+	return fmt.Sprintf("[POST /v1/payment/complete][%d] arkServiceCompletePaymentOK %s", 200, payload)
+}
+
+func (o *ArkServiceCompletePaymentOK) GetPayload() models.V1CompletePaymentResponse {
+	return o.Payload
+}
+
+func (o *ArkServiceCompletePaymentOK) readResponse(response runtime.ClientResponse, consumer runtime.Consumer, formats strfmt.Registry) error {
+
+	// response payload
+	if err := consumer.Consume(response.Body(), &o.Payload); err != nil && err != io.EOF {
+		return err
+	}
+
+	return nil
+}
+
+// NewArkServiceCompletePaymentDefault creates a ArkServiceCompletePaymentDefault with default headers values
+func NewArkServiceCompletePaymentDefault(code int) *ArkServiceCompletePaymentDefault {
+	return &ArkServiceCompletePaymentDefault{
+		_statusCode: code,
+	}
+}
+
+/*
+ArkServiceCompletePaymentDefault describes a response with status code -1, with default header values.
+
+An unexpected error response.
+*/
+type ArkServiceCompletePaymentDefault struct {
+	_statusCode int
+
+	Payload *models.RPCStatus
+}
+
+// IsSuccess returns true when this ark service complete payment default response has a 2xx status code
+func (o *ArkServiceCompletePaymentDefault) IsSuccess() bool {
+	return o._statusCode/100 == 2
+}
+
+// IsRedirect returns true when this ark service complete payment default response has a 3xx status code
+func (o *ArkServiceCompletePaymentDefault) IsRedirect() bool {
+	return o._statusCode/100 == 3
+}
+
+// IsClientError returns true when this ark service complete payment default response has a 4xx status code
+func (o *ArkServiceCompletePaymentDefault) IsClientError() bool {
+	return o._statusCode/100 == 4
+}
+
+// IsServerError returns true when this ark service complete payment default response has a 5xx status code
+func (o *ArkServiceCompletePaymentDefault) IsServerError() bool {
+	return o._statusCode/100 == 5
+}
+
+// IsCode returns true when this ark service complete payment default response a status code equal to that given
+func (o *ArkServiceCompletePaymentDefault) IsCode(code int) bool {
+	return o._statusCode == code
+}
+
+// Code gets the status code for the ark service complete payment default response
+func (o *ArkServiceCompletePaymentDefault) Code() int {
+	return o._statusCode
+}
+
+func (o *ArkServiceCompletePaymentDefault) Error() string {
+	payload, _ := json.Marshal(o.Payload)
+	return fmt.Sprintf("[POST /v1/payment/complete][%d] ArkService_CompletePayment default %s", o._statusCode, payload)
+}
+
+func (o *ArkServiceCompletePaymentDefault) String() string {
+	payload, _ := json.Marshal(o.Payload)
+	return fmt.Sprintf("[POST /v1/payment/complete][%d] ArkService_CompletePayment default %s", o._statusCode, payload)
+}
+
+func (o *ArkServiceCompletePaymentDefault) GetPayload() *models.RPCStatus {
+	return o.Payload
+}
+
+func (o *ArkServiceCompletePaymentDefault) readResponse(response runtime.ClientResponse, consumer runtime.Consumer, formats strfmt.Registry) error {
+
+	o.Payload = new(models.RPCStatus)
+
+	// response payload
+	if err := consumer.Consume(response.Body(), o.Payload); err != nil && err != io.EOF {
+		return err
+	}
+
+	return nil
+}

pkg/client-sdk/client/rest/service/arkservice/ark_service/ark_service_create_payment_parameters.go

@@ -0,0 +1,150 @@
+// Code generated by go-swagger; DO NOT EDIT.
+
+package ark_service
+
+// This file was generated by the swagger tool.
+// Editing this file might prove futile when you re-run the swagger generate command
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"github.com/go-openapi/errors"
+	"github.com/go-openapi/runtime"
+	cr "github.com/go-openapi/runtime/client"
+	"github.com/go-openapi/strfmt"
+
+	"github.com/ark-network/ark/pkg/client-sdk/client/rest/service/models"
+)
+
+// NewArkServiceCreatePaymentParams creates a new ArkServiceCreatePaymentParams object,
+// with the default timeout for this client.
+//
+// Default values are not hydrated, since defaults are normally applied by the API server side.
+//
+// To enforce default values in parameter, use SetDefaults or WithDefaults.
+func NewArkServiceCreatePaymentParams() *ArkServiceCreatePaymentParams {
+	return &ArkServiceCreatePaymentParams{
+		timeout: cr.DefaultTimeout,
+	}
+}
+
+// NewArkServiceCreatePaymentParamsWithTimeout creates a new ArkServiceCreatePaymentParams object
+// with the ability to set a timeout on a request.
+func NewArkServiceCreatePaymentParamsWithTimeout(timeout time.Duration) *ArkServiceCreatePaymentParams {
+	return &ArkServiceCreatePaymentParams{
+		timeout: timeout,
+	}
+}
+
+// NewArkServiceCreatePaymentParamsWithContext creates a new ArkServiceCreatePaymentParams object
+// with the ability to set a context for a request.
+func NewArkServiceCreatePaymentParamsWithContext(ctx context.Context) *ArkServiceCreatePaymentParams {
+	return &ArkServiceCreatePaymentParams{
+		Context: ctx,
+	}
+}
+
+// NewArkServiceCreatePaymentParamsWithHTTPClient creates a new ArkServiceCreatePaymentParams object
+// with the ability to set a custom HTTPClient for a request.
+func NewArkServiceCreatePaymentParamsWithHTTPClient(client *http.Client) *ArkServiceCreatePaymentParams {
+	return &ArkServiceCreatePaymentParams{
+		HTTPClient: client,
+	}
+}
+
+/*
+ArkServiceCreatePaymentParams contains all the parameters to send to the API endpoint
+
+	for the ark service create payment operation.
+
+	Typically these are written to a http.Request.
+*/
+type ArkServiceCreatePaymentParams struct {
+
+	// Body.
+	Body *models.V1CreatePaymentRequest
+
+	timeout    time.Duration
+	Context    context.Context
+	HTTPClient *http.Client
+}
+
+// WithDefaults hydrates default values in the ark service create payment params (not the query body).
+//
+// All values with no default are reset to their zero value.
+func (o *ArkServiceCreatePaymentParams) WithDefaults() *ArkServiceCreatePaymentParams {
+	o.SetDefaults()
+	return o
+}
+
+// SetDefaults hydrates default values in the ark service create payment params (not the query body).
+//
+// All values with no default are reset to their zero value.
+func (o *ArkServiceCreatePaymentParams) SetDefaults() {
+	// no default values defined for this parameter
+}
+
+// WithTimeout adds the timeout to the ark service create payment params
+func (o *ArkServiceCreatePaymentParams) WithTimeout(timeout time.Duration) *ArkServiceCreatePaymentParams {
+	o.SetTimeout(timeout)
+	return o
+}
+
+// SetTimeout adds the timeout to the ark service create payment params
+func (o *ArkServiceCreatePaymentParams) SetTimeout(timeout time.Duration) {
+	o.timeout = timeout
+}
+
+// WithContext adds the context to the ark service create payment params
+func (o *ArkServiceCreatePaymentParams) WithContext(ctx context.Context) *ArkServiceCreatePaymentParams {
+	o.SetContext(ctx)
+	return o
+}
+
+// SetContext adds the context to the ark service create payment params
+func (o *ArkServiceCreatePaymentParams) SetContext(ctx context.Context) {
+	o.Context = ctx
+}
+
+// WithHTTPClient adds the HTTPClient to the ark service create payment params
+func (o *ArkServiceCreatePaymentParams) WithHTTPClient(client *http.Client) *ArkServiceCreatePaymentParams {
+	o.SetHTTPClient(client)
+	return o
+}
+
+// SetHTTPClient adds the HTTPClient to the ark service create payment params
+func (o *ArkServiceCreatePaymentParams) SetHTTPClient(client *http.Client) {
+	o.HTTPClient = client
+}
+
+// WithBody adds the body to the ark service create payment params
+func (o *ArkServiceCreatePaymentParams) WithBody(body *models.V1CreatePaymentRequest) *ArkServiceCreatePaymentParams {
+	o.SetBody(body)
+	return o
+}
+
+// SetBody adds the body to the ark service create payment params
+func (o *ArkServiceCreatePaymentParams) SetBody(body *models.V1CreatePaymentRequest) {
+	o.Body = body
+}
+
+// WriteToRequest writes these params to a swagger request
+func (o *ArkServiceCreatePaymentParams) WriteToRequest(r runtime.ClientRequest, reg strfmt.Registry) error {
+
+	if err := r.SetTimeout(o.timeout); err != nil {
+		return err
+	}
+	var res []error
+	if o.Body != nil {
+		if err := r.SetBodyParam(o.Body); err != nil {
+			return err
+		}
+	}
+
+	if len(res) > 0 {
+		return errors.CompositeValidationError(res...)
+	}
+	return nil
+}

pkg/client-sdk/client/rest/service/arkservice/ark_service/ark_service_create_payment_responses.go

@@ -0,0 +1,187 @@
+// Code generated by go-swagger; DO NOT EDIT.
+
+package ark_service
+
+// This file was generated by the swagger tool.
+// Editing this file might prove futile when you re-run the swagger generate command
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+
+	"github.com/go-openapi/runtime"
+	"github.com/go-openapi/strfmt"
+
+	"github.com/ark-network/ark/pkg/client-sdk/client/rest/service/models"
+)
+
+// ArkServiceCreatePaymentReader is a Reader for the ArkServiceCreatePayment structure.
+type ArkServiceCreatePaymentReader struct {
+	formats strfmt.Registry
+}
+
+// ReadResponse reads a server response into the received o.
+func (o *ArkServiceCreatePaymentReader) ReadResponse(response runtime.ClientResponse, consumer runtime.Consumer) (interface{}, error) {
+	switch response.Code() {
+	case 200:
+		result := NewArkServiceCreatePaymentOK()
+		if err := result.readResponse(response, consumer, o.formats); err != nil {
+			return nil, err
+		}
+		return result, nil
+	default:
+		result := NewArkServiceCreatePaymentDefault(response.Code())
+		if err := result.readResponse(response, consumer, o.formats); err != nil {
+			return nil, err
+		}
+		if response.Code()/100 == 2 {
+			return result, nil
+		}
+		return nil, result
+	}
+}
+
+// NewArkServiceCreatePaymentOK creates a ArkServiceCreatePaymentOK with default headers values
+func NewArkServiceCreatePaymentOK() *ArkServiceCreatePaymentOK {
+	return &ArkServiceCreatePaymentOK{}
+}
+
+/*
+ArkServiceCreatePaymentOK describes a response with status code 200, with default header values.
+
+A successful response.
+*/
+type ArkServiceCreatePaymentOK struct {
+	Payload *models.V1CreatePaymentResponse
+}
+
+// IsSuccess returns true when this ark service create payment o k response has a 2xx status code
+func (o *ArkServiceCreatePaymentOK) IsSuccess() bool {
+	return true
+}
+
+// IsRedirect returns true when this ark service create payment o k response has a 3xx status code
+func (o *ArkServiceCreatePaymentOK) IsRedirect() bool {
+	return false
+}
+
+// IsClientError returns true when this ark service create payment o k response has a 4xx status code
+func (o *ArkServiceCreatePaymentOK) IsClientError() bool {
+	return false
+}
+
+// IsServerError returns true when this ark service create payment o k response has a 5xx status code
+func (o *ArkServiceCreatePaymentOK) IsServerError() bool {
+	return false
+}
+
+// IsCode returns true when this ark service create payment o k response a status code equal to that given
+func (o *ArkServiceCreatePaymentOK) IsCode(code int) bool {
+	return code == 200
+}
+
+// Code gets the status code for the ark service create payment o k response
+func (o *ArkServiceCreatePaymentOK) Code() int {
+	return 200
+}
+
+func (o *ArkServiceCreatePaymentOK) Error() string {
+	payload, _ := json.Marshal(o.Payload)
+	return fmt.Sprintf("[POST /v1/payment][%d] arkServiceCreatePaymentOK %s", 200, payload)
+}
+
+func (o *ArkServiceCreatePaymentOK) String() string {
+	payload, _ := json.Marshal(o.Payload)
+	return fmt.Sprintf("[POST /v1/payment][%d] arkServiceCreatePaymentOK %s", 200, payload)
+}
+
+func (o *ArkServiceCreatePaymentOK) GetPayload() *models.V1CreatePaymentResponse {
+	return o.Payload
+}
+
+func (o *ArkServiceCreatePaymentOK) readResponse(response runtime.ClientResponse, consumer runtime.Consumer, formats strfmt.Registry) error {
+
+	o.Payload = new(models.V1CreatePaymentResponse)
+
+	// response payload
+	if err := consumer.Consume(response.Body(), o.Payload); err != nil && err != io.EOF {
+		return err
+	}
+
+	return nil
+}
+
+// NewArkServiceCreatePaymentDefault creates a ArkServiceCreatePaymentDefault with default headers values
+func NewArkServiceCreatePaymentDefault(code int) *ArkServiceCreatePaymentDefault {
+	return &ArkServiceCreatePaymentDefault{
+		_statusCode: code,
+	}
+}
+
+/*
+ArkServiceCreatePaymentDefault describes a response with status code -1, with default header values.
+
+An unexpected error response.
+*/
+type ArkServiceCreatePaymentDefault struct {
+	_statusCode int
+
+	Payload *models.RPCStatus
+}
+
+// IsSuccess returns true when this ark service create payment default response has a 2xx status code
+func (o *ArkServiceCreatePaymentDefault) IsSuccess() bool {
+	return o._statusCode/100 == 2
+}
+
+// IsRedirect returns true when this ark service create payment default response has a 3xx status code
+func (o *ArkServiceCreatePaymentDefault) IsRedirect() bool {
+	return o._statusCode/100 == 3
+}
+
+// IsClientError returns true when this ark service create payment default response has a 4xx status code
+func (o *ArkServiceCreatePaymentDefault) IsClientError() bool {
+	return o._statusCode/100 == 4
+}
+
+// IsServerError returns true when this ark service create payment default response has a 5xx status code
+func (o *ArkServiceCreatePaymentDefault) IsServerError() bool {
+	return o._statusCode/100 == 5
+}
+
+// IsCode returns true when this ark service create payment default response a status code equal to that given
+func (o *ArkServiceCreatePaymentDefault) IsCode(code int) bool {
+	return o._statusCode == code
+}
+
+// Code gets the status code for the ark service create payment default response
+func (o *ArkServiceCreatePaymentDefault) Code() int {
+	return o._statusCode
+}
+
+func (o *ArkServiceCreatePaymentDefault) Error() string {
+	payload, _ := json.Marshal(o.Payload)
+	return fmt.Sprintf("[POST /v1/payment][%d] ArkService_CreatePayment default %s", o._statusCode, payload)
+}
+
+func (o *ArkServiceCreatePaymentDefault) String() string {
+	payload, _ := json.Marshal(o.Payload)
+	return fmt.Sprintf("[POST /v1/payment][%d] ArkService_CreatePayment default %s", o._statusCode, payload)
+}
+
+func (o *ArkServiceCreatePaymentDefault) GetPayload() *models.RPCStatus {
+	return o.Payload
+}
+
+func (o *ArkServiceCreatePaymentDefault) readResponse(response runtime.ClientResponse, consumer runtime.Consumer, formats strfmt.Registry) error {
+
+	o.Payload = new(models.RPCStatus)
+
+	// response payload
+	if err := consumer.Consume(response.Body(), o.Payload); err != nil && err != io.EOF {
+		return err
+	}
+
+	return nil
+}

pkg/client-sdk/client/rest/service/models/v1_complete_payment_request.go

@@ -0,0 +1,53 @@
+// Code generated by go-swagger; DO NOT EDIT.
+
+package models
+
+// This file was generated by the swagger tool.
+// Editing this file might prove futile when you re-run the swagger generate command
+
+import (
+	"context"
+
+	"github.com/go-openapi/strfmt"
+	"github.com/go-openapi/swag"
+)
+
+// V1CompletePaymentRequest v1 complete payment request
+//
+// swagger:model v1CompletePaymentRequest
+type V1CompletePaymentRequest struct {
+
+	// signed redeem tx
+	SignedRedeemTx string `json:"signedRedeemTx,omitempty"`
+
+	// signed unconditional forfeit txs
+	SignedUnconditionalForfeitTxs []string `json:"signedUnconditionalForfeitTxs"`
+}
+
+// Validate validates this v1 complete payment request
+func (m *V1CompletePaymentRequest) Validate(formats strfmt.Registry) error {
+	return nil
+}
+
+// ContextValidate validates this v1 complete payment request based on context it is used
+func (m *V1CompletePaymentRequest) ContextValidate(ctx context.Context, formats strfmt.Registry) error {
+	return nil
+}
+
+// MarshalBinary interface implementation
+func (m *V1CompletePaymentRequest) MarshalBinary() ([]byte, error) {
+	if m == nil {
+		return nil, nil
+	}
+	return swag.WriteJSON(m)
+}
+
+// UnmarshalBinary interface implementation
+func (m *V1CompletePaymentRequest) UnmarshalBinary(b []byte) error {
+	var res V1CompletePaymentRequest
+	if err := swag.ReadJSON(b, &res); err != nil {
+		return err
+	}
+	*m = res
+	return nil
+}

pkg/client-sdk/client/rest/service/models/v1_complete_payment_response.go

@@ -0,0 +1,11 @@
+// Code generated by go-swagger; DO NOT EDIT.
+
+package models
+
+// This file was generated by the swagger tool.
+// Editing this file might prove futile when you re-run the swagger generate command
+
+// V1CompletePaymentResponse v1 complete payment response
+//
+// swagger:model v1CompletePaymentResponse
+type V1CompletePaymentResponse interface{}

pkg/client-sdk/client/rest/service/models/v1_create_payment_request.go

@@ -0,0 +1,183 @@
+// Code generated by go-swagger; DO NOT EDIT.
+
+package models
+
+// This file was generated by the swagger tool.
+// Editing this file might prove futile when you re-run the swagger generate command
+
+import (
+	"context"
+	"strconv"
+
+	"github.com/go-openapi/errors"
+	"github.com/go-openapi/strfmt"
+	"github.com/go-openapi/swag"
+)
+
+// V1CreatePaymentRequest v1 create payment request
+//
+// swagger:model v1CreatePaymentRequest
+type V1CreatePaymentRequest struct {
+
+	// inputs
+	Inputs []*V1Input `json:"inputs"`
+
+	// outputs
+	Outputs []*V1Output `json:"outputs"`
+}
+
+// Validate validates this v1 create payment request
+func (m *V1CreatePaymentRequest) Validate(formats strfmt.Registry) error {
+	var res []error
+
+	if err := m.validateInputs(formats); err != nil {
+		res = append(res, err)
+	}
+
+	if err := m.validateOutputs(formats); err != nil {
+		res = append(res, err)
+	}
+
+	if len(res) > 0 {
+		return errors.CompositeValidationError(res...)
+	}
+	return nil
+}
+
+func (m *V1CreatePaymentRequest) validateInputs(formats strfmt.Registry) error {
+	if swag.IsZero(m.Inputs) { // not required
+		return nil
+	}
+
+	for i := 0; i < len(m.Inputs); i++ {
+		if swag.IsZero(m.Inputs[i]) { // not required
+			continue
+		}
+
+		if m.Inputs[i] != nil {
+			if err := m.Inputs[i].Validate(formats); err != nil {
+				if ve, ok := err.(*errors.Validation); ok {
+					return ve.ValidateName("inputs" + "." + strconv.Itoa(i))
+				} else if ce, ok := err.(*errors.CompositeError); ok {
+					return ce.ValidateName("inputs" + "." + strconv.Itoa(i))
+				}
+				return err
+			}
+		}
+
+	}
+
+	return nil
+}
+
+func (m *V1CreatePaymentRequest) validateOutputs(formats strfmt.Registry) error {
+	if swag.IsZero(m.Outputs) { // not required
+		return nil
+	}
+
+	for i := 0; i < len(m.Outputs); i++ {
+		if swag.IsZero(m.Outputs[i]) { // not required
+			continue
+		}
+
+		if m.Outputs[i] != nil {
+			if err := m.Outputs[i].Validate(formats); err != nil {
+				if ve, ok := err.(*errors.Validation); ok {
+					return ve.ValidateName("outputs" + "." + strconv.Itoa(i))
+				} else if ce, ok := err.(*errors.CompositeError); ok {
+					return ce.ValidateName("outputs" + "." + strconv.Itoa(i))
+				}
+				return err
+			}
+		}
+
+	}
+
+	return nil
+}
+
+// ContextValidate validate this v1 create payment request based on the context it is used
+func (m *V1CreatePaymentRequest) ContextValidate(ctx context.Context, formats strfmt.Registry) error {
+	var res []error
+
+	if err := m.contextValidateInputs(ctx, formats); err != nil {
+		res = append(res, err)
+	}
+
+	if err := m.contextValidateOutputs(ctx, formats); err != nil {
+		res = append(res, err)
+	}
+
+	if len(res) > 0 {
+		return errors.CompositeValidationError(res...)
+	}
+	return nil
+}
+
+func (m *V1CreatePaymentRequest) contextValidateInputs(ctx context.Context, formats strfmt.Registry) error {
+
+	for i := 0; i < len(m.Inputs); i++ {
+
+		if m.Inputs[i] != nil {
+
+			if swag.IsZero(m.Inputs[i]) { // not required
+				return nil
+			}
+
+			if err := m.Inputs[i].ContextValidate(ctx, formats); err != nil {
+				if ve, ok := err.(*errors.Validation); ok {
+					return ve.ValidateName("inputs" + "." + strconv.Itoa(i))
+				} else if ce, ok := err.(*errors.CompositeError); ok {
+					return ce.ValidateName("inputs" + "." + strconv.Itoa(i))
+				}
+				return err
+			}
+		}
+
+	}
+
+	return nil
+}
+
+func (m *V1CreatePaymentRequest) contextValidateOutputs(ctx context.Context, formats strfmt.Registry) error {
+
+	for i := 0; i < len(m.Outputs); i++ {
+
+		if m.Outputs[i] != nil {
+
+			if swag.IsZero(m.Outputs[i]) { // not required
+				return nil
+			}
+
+			if err := m.Outputs[i].ContextValidate(ctx, formats); err != nil {
+				if ve, ok := err.(*errors.Validation); ok {
+					return ve.ValidateName("outputs" + "." + strconv.Itoa(i))
+				} else if ce, ok := err.(*errors.CompositeError); ok {
+					return ce.ValidateName("outputs" + "." + strconv.Itoa(i))
+				}
+				return err
+			}
+		}
+
+	}
+
+	return nil
+}
+
+// MarshalBinary interface implementation
+func (m *V1CreatePaymentRequest) MarshalBinary() ([]byte, error) {
+	if m == nil {
+		return nil, nil
+	}
+	return swag.WriteJSON(m)
+}
+
+// UnmarshalBinary interface implementation
+func (m *V1CreatePaymentRequest) UnmarshalBinary(b []byte) error {
+	var res V1CreatePaymentRequest
+	if err := swag.ReadJSON(b, &res); err != nil {
+		return err
+	}
+	*m = res
+	return nil
+}

pkg/client-sdk/client/rest/service/models/v1_create_payment_response.go

@@ -0,0 +1,53 @@
+// Code generated by go-swagger; DO NOT EDIT.
+
+package models
+
+// This file was generated by the swagger tool.
+// Editing this file might prove futile when you re-run the swagger generate command
+
+import (
+	"context"
+
+	"github.com/go-openapi/strfmt"
+	"github.com/go-openapi/swag"
+)
+
+// V1CreatePaymentResponse v1 create payment response
+//
+// swagger:model v1CreatePaymentResponse
+type V1CreatePaymentResponse struct {
+
+	// signed only by the ASP
+	SignedRedeemTx string `json:"signedRedeemTx,omitempty"`
+
+	// usigned unconditional forfeit txs
+	UsignedUnconditionalForfeitTxs []string `json:"usignedUnconditionalForfeitTxs"`
+}
+
+// Validate validates this v1 create payment response
+func (m *V1CreatePaymentResponse) Validate(formats strfmt.Registry) error {
+	return nil
+}
+
+// ContextValidate validates this v1 create payment response based on context it is used
+func (m *V1CreatePaymentResponse) ContextValidate(ctx context.Context, formats strfmt.Registry) error {
+	return nil
+}
+
+// MarshalBinary interface implementation
+func (m *V1CreatePaymentResponse) MarshalBinary() ([]byte, error) {
+	if m == nil {
+		return nil, nil
+	}
+	return swag.WriteJSON(m)
+}
+
+// UnmarshalBinary interface implementation
+func (m *V1CreatePaymentResponse) UnmarshalBinary(b []byte) error {
+	var res V1CreatePaymentResponse
+	if err := swag.ReadJSON(b, &res); err != nil {
+		return err
+	}
+	*m = res
+	return nil
+}

pkg/client-sdk/client/rest/service/models/v1_pending_payment.go

@@ -0,0 +1,53 @@
+// Code generated by go-swagger; DO NOT EDIT.
+
+package models
+
+// This file was generated by the swagger tool.
+// Editing this file might prove futile when you re-run the swagger generate command
+
+import (
+	"context"
+
+	"github.com/go-openapi/strfmt"
+	"github.com/go-openapi/swag"
+)
+
+// V1PendingPayment v1 pending payment
+//
+// swagger:model v1PendingPayment
+type V1PendingPayment struct {
+
+	// redeem tx
+	RedeemTx string `json:"redeemTx,omitempty"`
+
+	// unconditional forfeit txs
+	UnconditionalForfeitTxs []string `json:"unconditionalForfeitTxs"`
+}
+
+// Validate validates this v1 pending payment
+func (m *V1PendingPayment) Validate(formats strfmt.Registry) error {
+	return nil
+}
+
+// ContextValidate validates this v1 pending payment based on context it is used
+func (m *V1PendingPayment) ContextValidate(ctx context.Context, formats strfmt.Registry) error {
+	return nil
+}
+
+// MarshalBinary interface implementation
+func (m *V1PendingPayment) MarshalBinary() ([]byte, error) {
+	if m == nil {
+		return nil, nil
+	}
+	return swag.WriteJSON(m)
+}
+
+// UnmarshalBinary interface implementation
+func (m *V1PendingPayment) UnmarshalBinary(b []byte) error {
+	var res V1PendingPayment
+	if err := swag.ReadJSON(b, &res); err != nil {
+		return err
+	}
+	*m = res
+	return nil
+}

pkg/client-sdk/client/rest/service/models/v1_vtxo.go

@@ -24,6 +24,12 @@ type V1Vtxo struct {
 	// outpoint
 	Outpoint *V1Input `json:"outpoint,omitempty"`
 
+	// pending
+	Pending bool `json:"pending,omitempty"`
+
+	// pending data
+	PendingData *V1PendingPayment `json:"pendingData,omitempty"`
+
 	// pool txid
 	PoolTxid string `json:"poolTxid,omitempty"`
 
@@ -48,6 +54,10 @@ func (m *V1Vtxo) Validate(formats strfmt.Registry) error {
 		res = append(res, err)
 	}
 
+	if err := m.validatePendingData(formats); err != nil {
+		res = append(res, err)
+	}
+
 	if err := m.validateReceiver(formats); err != nil {
 		res = append(res, err)
 	}
@@ -77,6 +87,25 @@ func (m *V1Vtxo) validateOutpoint(formats strfmt.Registry) error {
 	return nil
 }
 
+func (m *V1Vtxo) validatePendingData(formats strfmt.Registry) error {
+	if swag.IsZero(m.PendingData) { // not required
+		return nil
+	}
+
+	if m.PendingData != nil {
+		if err := m.PendingData.Validate(formats); err != nil {
+			if ve, ok := err.(*errors.Validation); ok {
+				return ve.ValidateName("pendingData")
+			} else if ce, ok := err.(*errors.CompositeError); ok {
+				return ce.ValidateName("pendingData")
+			}
+			return err
+		}
+	}
+
+	return nil
+}
+
 func (m *V1Vtxo) validateReceiver(formats strfmt.Registry) error {
 	if swag.IsZero(m.Receiver) { // not required
 		return nil
@@ -104,6 +133,10 @@ func (m *V1Vtxo) ContextValidate(ctx context.Context, formats strfmt.Registry) e
 		res = append(res, err)
 	}
 
+	if err := m.contextValidatePendingData(ctx, formats); err != nil {
+		res = append(res, err)
+	}
+
 	if err := m.contextValidateReceiver(ctx, formats); err != nil {
 		res = append(res, err)
 	}
@@ -135,6 +168,27 @@ func (m *V1Vtxo) contextValidateOutpoint(ctx context.Context, formats strfmt.Reg
 	return nil
 }
 
+func (m *V1Vtxo) contextValidatePendingData(ctx context.Context, formats strfmt.Registry) error {
+
+	if m.PendingData != nil {
+
+		if swag.IsZero(m.PendingData) { // not required
+			return nil
+		}
+
+		if err := m.PendingData.ContextValidate(ctx, formats); err != nil {
+			if ve, ok := err.(*errors.Validation); ok {
+				return ve.ValidateName("pendingData")
+			} else if ce, ok := err.(*errors.CompositeError); ok {
+				return ce.ValidateName("pendingData")
+			}
+			return err
+		}
+	}
+
+	return nil
+}
+
 func (m *V1Vtxo) contextValidateReceiver(ctx context.Context, formats strfmt.Registry) error {
 
 	if m.Receiver != nil {

pkg/client-sdk/covenant_client.go

@@ -547,6 +547,17 @@ func (a *covenantArkClient) CollaborativeRedeem(
 	return poolTxID, nil
 }
 
+func (a *covenantArkClient) SendAsync(
+	ctx context.Context,
+	withExpiryCoinselect bool, receivers []Receiver,
+) (string, error) {
+	return "", fmt.Errorf("not implemented")
+}
+
+func (a *covenantArkClient) ClaimAsync(ctx context.Context) (string, error) {
+	return "", fmt.Errorf("not implemented")
+}
+
 func (a *covenantArkClient) sendOnchain(
 	ctx context.Context, receivers []Receiver,
 ) (string, error) {

pkg/client-sdk/covenantless_client.go

@@ -478,7 +478,7 @@ func (a *covenantlessArkClient) UnilateralRedeem(ctx context.Context) error {
 
 	vtxos := make([]client.Vtxo, 0)
 	for _, offchainAddr := range offchainAddrs {
-		spendableVtxos, err := a.getVtxos(ctx, offchainAddr, false)
+		spendableVtxos, _, err := a.getVtxos(ctx, offchainAddr, false)
 		if err != nil {
 			return err
 		}
@@ -574,7 +574,7 @@ func (a *covenantlessArkClient) CollaborativeRedeem(
 
 	vtxos := make([]client.Vtxo, 0)
 	for _, offchainAddr := range offchainAddrs {
-		spendableVtxos, err := a.getVtxos(ctx, offchainAddr, withExpiryCoinselect)
+		spendableVtxos, _, err := a.getVtxos(ctx, offchainAddr, withExpiryCoinselect)
 		if err != nil {
 			return "", err
 		}
@@ -627,6 +627,145 @@ func (a *covenantlessArkClient) CollaborativeRedeem(
 	return poolTxID, nil
 }
 
+func (a *covenantlessArkClient) SendAsync(
+	ctx context.Context,
+	withExpiryCoinselect bool, receivers []Receiver,
+) (string, error) {
+	if len(receivers) <= 0 {
+		return "", fmt.Errorf("missing receivers")
+	}
+
+	for _, receiver := range receivers {
+		isOnchain, _, _, err := utils.DecodeReceiverAddress(receiver.To())
+		if err != nil {
+			return "", err
+		}
+		if isOnchain {
+			return "", fmt.Errorf("all receiver addresses must be offchain addresses")
+		}
+	}
+
+	offchainAddrs, _, _, err := a.wallet.GetAddresses(ctx)
+	if err != nil {
+		return "", err
+	}
+
+	_, _, aspPubKey, err := common.DecodeAddress(offchainAddrs[0])
+	if err != nil {
+		return "", err
+	}
+
+	receiversOutput := make([]client.Output, 0)
+	sumOfReceivers := uint64(0)
+
+	for _, receiver := range receivers {
+		_, _, aspKey, err := common.DecodeAddress(receiver.To())
+		if err != nil {
+			return "", fmt.Errorf("invalid receiver address: %s", err)
+		}
+
+		if !bytes.Equal(
+			aspPubKey.SerializeCompressed(), aspKey.SerializeCompressed(),
+		) {
+			return "", fmt.Errorf("invalid receiver address '%s': must be associated with the connected service provider", receiver)
+		}
+
+		if receiver.Amount() < DUST {
+			return "", fmt.Errorf("invalid amount (%d), must be greater than dust %d", receiver.Amount(), DUST)
+		}
+
+		receiversOutput = append(receiversOutput, client.Output{
+			Address: receiver.To(),
+			Amount:  receiver.Amount(),
+		})
+		sumOfReceivers += receiver.Amount()
+	}
+
+	vtxos, _, err := a.getVtxos(ctx, offchainAddrs[0], withExpiryCoinselect)
+	if err != nil {
+		return "", err
+	}
+	selectedCoins, changeAmount, err := utils.CoinSelect(
+		vtxos, sumOfReceivers, DUST, withExpiryCoinselect,
+	)
+	if err != nil {
+		return "", err
+	}
+
+	if changeAmount > 0 {
+		changeReceiver := client.Output{
+			Address: offchainAddrs[0],
+			Amount:  changeAmount,
+		}
+		receiversOutput = append(receiversOutput, changeReceiver)
+	}
+
+	inputs := make([]client.VtxoKey, 0, len(selectedCoins))
+
+	for _, coin := range selectedCoins {
+		inputs = append(inputs, coin.VtxoKey)
+	}
+
+	redeemTx, unconditionalForfeitTxs, err := a.client.CreatePayment(
+		ctx, inputs, receiversOutput)
+	if err != nil {
+		return "", err
+	}
+
+	// TODO verify the redeem tx signature
+
+	signedUnconditionalForfeitTxs := make([]string, 0, len(unconditionalForfeitTxs))
+	for _, tx := range unconditionalForfeitTxs {
+		signedForfeitTx, err := a.wallet.SignTransaction(ctx, a.explorer, tx)
+		if err != nil {
+			return "", err
+		}
+
+		signedUnconditionalForfeitTxs = append(signedUnconditionalForfeitTxs, signedForfeitTx)
+	}
+
+	signedRedeemTx, err := a.wallet.SignTransaction(ctx, a.explorer, redeemTx)
+	if err != nil {
+		return "", err
+	}
+
+	if err = a.client.CompletePayment(
+		ctx, signedRedeemTx, signedUnconditionalForfeitTxs,
+	); err != nil {
+		return "", err
+	}
+
+	return signedRedeemTx, nil
+}
+
+func (a *covenantlessArkClient) ClaimAsync(
+	ctx context.Context,
+) (string, error) {
+	myselfOffchain, _, err := a.wallet.NewAddress(ctx, false)
+	if err != nil {
+		return "", err
+	}
+
+	_, pendingVtxos, err := a.getVtxos(ctx, myselfOffchain, false)
+	if err != nil {
+		return "", err
+	}
+
+	var pendingBalance uint64
+	for _, vtxo := range pendingVtxos {
+		pendingBalance += vtxo.Amount
+	}
+	if pendingBalance == 0 {
+		return "", nil
+	}
+
+	receiver := client.Output{
+		Address: myselfOffchain,
+		Amount:  pendingBalance,
+	}
+	return a.selfTransferAllPendingPayments(ctx, pendingVtxos, receiver)
+}
+
 func (a *covenantlessArkClient) sendOnchain(
 	ctx context.Context, receivers []Receiver,
 ) (string, error) {
@@ -817,7 +956,7 @@ func (a *covenantlessArkClient) sendOffchain(
 
 	vtxos := make([]client.Vtxo, 0)
 	for _, offchainAddr := range offchainAddrs {
-		spendableVtxos, err := a.getVtxos(ctx, offchainAddr, withExpiryCoinselect)
+		spendableVtxos, _, err := a.getVtxos(ctx, offchainAddr, withExpiryCoinselect)
 		if err != nil {
 			return "", err
 		}
@@ -1394,16 +1533,20 @@ func (a *covenantlessArkClient) getRedeemBranches(
 	return redeemBranches, nil
 }
 
+// TODO (@louisinger): return pending balance in dedicated map.
+// Currently, the returned balance is calculated from both spendable and
+// pending vtxos.
 func (a *covenantlessArkClient) getOffchainBalance(
 	ctx context.Context, addr string, computeVtxoExpiration bool,
 ) (uint64, map[int64]uint64, error) {
 	amountByExpiration := make(map[int64]uint64, 0)
 
-	vtxos, err := a.getVtxos(ctx, addr, computeVtxoExpiration)
+	spendableVtxos, pendingVtxos, err := a.getVtxos(ctx, addr, computeVtxoExpiration)
 	if err != nil {
 		return 0, nil, err
 	}
 	var balance uint64
+	vtxos := append(spendableVtxos, pendingVtxos...)
 	for _, vtxo := range vtxos {
 		balance += vtxo.Amount
 
@@ -1423,28 +1566,38 @@ func (a *covenantlessArkClient) getOffchainBalance(
 
 func (a *covenantlessArkClient) getVtxos(
 	ctx context.Context, addr string, computeVtxoExpiration bool,
-) ([]client.Vtxo, error) {
+) ([]client.Vtxo, []client.Vtxo, error) {
 	vtxos, _, err := a.client.ListVtxos(ctx, addr)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
+	}
+
+	pendingVtxos := make([]client.Vtxo, 0)
+	spendableVtxos := make([]client.Vtxo, 0)
+	for _, vtxo := range vtxos {
+		if vtxo.Pending {
+			pendingVtxos = append(pendingVtxos, vtxo)
+			continue
+		}
+		spendableVtxos = append(spendableVtxos, vtxo)
 	}
 
 	if !computeVtxoExpiration {
-		return vtxos, nil
+		return spendableVtxos, pendingVtxos, nil
 	}
 
-	redeemBranches, err := a.getRedeemBranches(ctx, vtxos)
+	redeemBranches, err := a.getRedeemBranches(ctx, spendableVtxos)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 
 	for vtxoTxid, branch := range redeemBranches {
 		expiration, err := branch.ExpiresAt()
 		if err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 
-		for i, vtxo := range vtxos {
+		for i, vtxo := range spendableVtxos {
 			if vtxo.Txid == vtxoTxid {
 				vtxos[i].ExpiresAt = expiration
 				break
@@ -1452,5 +1605,35 @@ func (a *covenantlessArkClient) getVtxos(
 		}
 	}
 
-	return vtxos, nil
+	return spendableVtxos, pendingVtxos, nil
+}
+
+func (a *covenantlessArkClient) selfTransferAllPendingPayments(
+	ctx context.Context, pendingVtxos []client.Vtxo, myself client.Output,
+) (string, error) {
+	inputs := make([]client.VtxoKey, 0, len(pendingVtxos))
+
+	for _, coin := range pendingVtxos {
+		inputs = append(inputs, coin.VtxoKey)
+	}
+
+	outputs := []client.Output{myself}
+
+	paymentID, err := a.client.RegisterPayment(ctx, inputs)
+	if err != nil {
+		return "", err
+	}
+
+	if err := a.client.ClaimPayment(ctx, paymentID, outputs); err != nil {
+		return "", err
+	}
+
+	roundTxid, err := a.handleRoundStream(
+		ctx, paymentID, pendingVtxos, outputs,
+	)
+	if err != nil {
+		return "", err
+	}
+
+	return roundTxid, nil
 }

pkg/client-sdk/example/covenantless/alice_to_bob.go

@@ -106,12 +106,11 @@ func main() {
 	fmt.Println("")
 	log.Infof("alice is sending %d sats to bob offchain...", amount)
 
-	txid, err = aliceArkClient.SendOffChain(ctx, false, receivers)
-	if err != nil {
+	if _, err = aliceArkClient.SendAsync(ctx, false, receivers); err != nil {
 		log.Fatal(err)
 	}
 
-	log.Infof("payment completed in round tx: %s", txid)
+	log.Info("payment completed out of round")
 
 	if err := generateBlock(); err != nil {
 		log.Fatal(err)
@@ -135,6 +134,15 @@ func main() {
 
 	log.Infof("bob onchain balance: %d", bobBalance.OnchainBalance.SpendableAmount)
 	log.Infof("bob offchain balance: %d", bobBalance.OffchainBalance.Total)
+
+	fmt.Println("")
+	log.Info("bob is claiming the incoming payment...")
+	roundTxid, err := bobArkClient.ClaimAsync(ctx)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	log.Infof("bob claimed the incoming payment in round %s", roundTxid)
 }
 
 func setupArkClient() (arksdk.ArkClient, error) {

pkg/client-sdk/explorer/explorer.go

@@ -15,7 +15,6 @@ import (
 	"github.com/ark-network/ark/pkg/client-sdk/internal/utils"
 	"github.com/btcsuite/btcd/btcutil/psbt"
 	"github.com/btcsuite/btcd/wire"
-	log "github.com/sirupsen/logrus"
 	"github.com/vulpemventures/go-elements/psetv2"
 	"github.com/vulpemventures/go-elements/transaction"
 )
@@ -97,8 +96,7 @@ func (e *explorerSvc) GetFeeRate() (float64, error) {
 	}
 
 	if len(response) == 0 {
-		log.Debug("empty fee-estimates response, default to 2 sat/vbyte")
-		return 2, nil
+		return 1, nil
 	}
 
 	return response["1"], nil

pkg/client-sdk/wallet/singlekey/bitcoin_wallet.go

@@ -201,7 +201,7 @@ func (s *bitcoinWallet) SignTransaction(
 				switch c := closure.(type) {
 				case *bitcointree.CSVSigClosure:
 					sign = bytes.Equal(c.Pubkey.SerializeCompressed()[1:], pubkey.SerializeCompressed()[1:])
-				case *bitcointree.ForfeitClosure:
+				case *bitcointree.MultisigClosure:
 					sign = bytes.Equal(c.Pubkey.SerializeCompressed()[1:], pubkey.SerializeCompressed()[1:])
 				}
 

server/Makefile

@@ -33,13 +33,16 @@ lint:
 ## run: run in dev mode
 run: clean
 	@echo "Running arkd in dev mode..."
-	@export ARK_WALLET_ADDR=localhost:18000; \
+	@export ARK_NEUTRINO_PEER=localhost:18444; \
 	export ARK_ROUND_INTERVAL=10; \
 	export ARK_LOG_LEVEL=5; \
-	export ARK_NETWORK=liquidregtest; \
+	export ARK_NETWORK=regtest; \
 	export ARK_PORT=8080; \
 	export ARK_NO_TLS=true; \
 	export ARK_NO_MACAROONS=true; \
+	export ARK_TX_BUILDER_TYPE=covenantless; \
+	export ARK_ESPLORA_URL=http://localhost:3000; \
+	export ARK_MIN_RELAY_FEE=200; \
 	go run ./cmd/arkd
 
 ## test: runs unit and component tests

server/api-spec/openapi/swagger/ark/v1/service.swagger.json

@@ -101,6 +101,38 @@
         ]
       }
     },
+    "/v1/payment": {
+      "post": {
+        "operationId": "ArkService_CreatePayment",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1CreatePaymentResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/v1CreatePaymentRequest"
+            }
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
     "/v1/payment/claim": {
       "post": {
         "operationId": "ArkService_ClaimPayment",
@@ -133,6 +165,38 @@
         ]
       }
     },
+    "/v1/payment/complete": {
+      "post": {
+        "operationId": "ArkService_CompletePayment",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1CompletePaymentResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/v1CompletePaymentRequest"
+            }
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
     "/v1/payment/finalize": {
       "post": {
         "operationId": "ArkService_FinalizePayment",
@@ -368,6 +432,57 @@
     "v1ClaimPaymentResponse": {
       "type": "object"
     },
+    "v1CompletePaymentRequest": {
+      "type": "object",
+      "properties": {
+        "signedRedeemTx": {
+          "type": "string"
+        },
+        "signedUnconditionalForfeitTxs": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        }
+      }
+    },
+    "v1CompletePaymentResponse": {
+      "type": "object"
+    },
+    "v1CreatePaymentRequest": {
+      "type": "object",
+      "properties": {
+        "inputs": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/v1Input"
+          }
+        },
+        "outputs": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/v1Output"
+          }
+        }
+      }
+    },
+    "v1CreatePaymentResponse": {
+      "type": "object",
+      "properties": {
+        "signedRedeemTx": {
+          "type": "string",
+          "title": "signed only by the ASP"
+        },
+        "usignedUnconditionalForfeitTxs": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        }
+      }
+    },
     "v1FinalizePaymentRequest": {
       "type": "object",
       "properties": {
@@ -517,6 +632,20 @@
         }
       }
     },
+    "v1PendingPayment": {
+      "type": "object",
+      "properties": {
+        "redeemTx": {
+          "type": "string"
+        },
+        "unconditionalForfeitTxs": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        }
+      }
+    },
     "v1PingResponse": {
       "type": "object",
       "properties": {
@@ -696,6 +825,12 @@
         },
         "swept": {
           "type": "boolean"
+        },
+        "pending": {
+          "type": "boolean"
+        },
+        "pendingData": {
+          "$ref": "#/definitions/v1PendingPayment"
         }
       }
     }

server/api-spec/openapi/swagger/clark/v1/service.swagger.json

@@ -0,0 +1,820 @@
+{
+  "swagger": "2.0",
+  "info": {
+    "title": "clark/v1/service.proto",
+    "version": "version not set"
+  },
+  "tags": [
+    {
+      "name": "ArkService"
+    }
+  ],
+  "consumes": [
+    "application/json"
+  ],
+  "produces": [
+    "application/json"
+  ],
+  "paths": {
+    "/v1/events": {
+      "get": {
+        "operationId": "ArkService_GetEventStream",
+        "responses": {
+          "200": {
+            "description": "A successful response.(streaming responses)",
+            "schema": {
+              "type": "object",
+              "properties": {
+                "result": {
+                  "$ref": "#/definitions/v1GetEventStreamResponse"
+                },
+                "error": {
+                  "$ref": "#/definitions/rpcStatus"
+                }
+              },
+              "title": "Stream result of v1GetEventStreamResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
+    "/v1/info": {
+      "get": {
+        "operationId": "ArkService_GetInfo",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1GetInfoResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
+    "/v1/onboard": {
+      "post": {
+        "operationId": "ArkService_Onboard",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1OnboardResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/v1OnboardRequest"
+            }
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
+    "/v1/payment/async": {
+      "post": {
+        "operationId": "ArkService_CreateAsyncPayment",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1CreateAsyncPaymentResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/v1CreateAsyncPaymentRequest"
+            }
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
+    "/v1/payment/async/complete": {
+      "post": {
+        "operationId": "ArkService_CompleteAsyncPayment",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1CompleteAsyncPaymentResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/v1CompleteAsyncPaymentRequest"
+            }
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
+    "/v1/payment/claim": {
+      "post": {
+        "operationId": "ArkService_ClaimPayment",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1ClaimPaymentResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/v1ClaimPaymentRequest"
+            }
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
+    "/v1/payment/finalize": {
+      "post": {
+        "operationId": "ArkService_FinalizePayment",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1FinalizePaymentResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/v1FinalizePaymentRequest"
+            }
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
+    "/v1/payment/register": {
+      "post": {
+        "operationId": "ArkService_RegisterPayment",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1RegisterPaymentResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/v1RegisterPaymentRequest"
+            }
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
+    "/v1/ping/{paymentId}": {
+      "get": {
+        "operationId": "ArkService_Ping",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1PingResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "paymentId",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
+    "/v1/round/id/{id}": {
+      "get": {
+        "operationId": "ArkService_GetRoundById",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1GetRoundByIdResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "id",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
+    "/v1/round/{txid}": {
+      "get": {
+        "summary": "TODO BTC: signTree rpc",
+        "operationId": "ArkService_GetRound",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1GetRoundResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "txid",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
+    "/v1/vtxos/{address}": {
+      "get": {
+        "operationId": "ArkService_ListVtxos",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1ListVtxosResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "address",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    }
+  },
+  "definitions": {
+    "protobufAny": {
+      "type": "object",
+      "properties": {
+        "@type": {
+          "type": "string"
+        }
+      },
+      "additionalProperties": {}
+    },
+    "rpcStatus": {
+      "type": "object",
+      "properties": {
+        "code": {
+          "type": "integer",
+          "format": "int32"
+        },
+        "message": {
+          "type": "string"
+        },
+        "details": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/protobufAny"
+          }
+        }
+      }
+    },
+    "v1ClaimPaymentRequest": {
+      "type": "object",
+      "properties": {
+        "id": {
+          "type": "string",
+          "description": "Mocks wabisabi's credentials."
+        },
+        "outputs": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/v1Output"
+          },
+          "description": "List of receivers for a registered payment."
+        }
+      }
+    },
+    "v1ClaimPaymentResponse": {
+      "type": "object"
+    },
+    "v1CompleteAsyncPaymentRequest": {
+      "type": "object",
+      "properties": {
+        "signedSenderTx": {
+          "type": "string"
+        },
+        "signedReceiverTx": {
+          "type": "string"
+        },
+        "signedUnconditionalForfeitTx": {
+          "type": "string"
+        }
+      }
+    },
+    "v1CompleteAsyncPaymentResponse": {
+      "type": "object",
+      "properties": {
+        "senderTx": {
+          "type": "string"
+        },
+        "receiverTx": {
+          "type": "string"
+        },
+        "unconditionalForfeitTx": {
+          "type": "string"
+        }
+      }
+    },
+    "v1CreateAsyncPaymentRequest": {
+      "type": "object",
+      "properties": {
+        "input": {
+          "$ref": "#/definitions/v1Input"
+        },
+        "receiverPubkey": {
+          "type": "string"
+        }
+      }
+    },
+    "v1CreateAsyncPaymentResponse": {
+      "type": "object",
+      "properties": {
+        "unsignedSenderTx": {
+          "type": "string"
+        },
+        "unsignedReceiverTx": {
+          "type": "string"
+        },
+        "usignedUnconditionalForfeitTx": {
+          "type": "string"
+        }
+      }
+    },
+    "v1FinalizePaymentRequest": {
+      "type": "object",
+      "properties": {
+        "signedForfeitTxs": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "description": "Forfeit txs signed by the user."
+        }
+      }
+    },
+    "v1FinalizePaymentResponse": {
+      "type": "object"
+    },
+    "v1GetEventStreamResponse": {
+      "type": "object",
+      "properties": {
+        "roundFinalization": {
+          "$ref": "#/definitions/v1RoundFinalizationEvent",
+          "title": "TODO: BTC add \"signTree\" event"
+        },
+        "roundFinalized": {
+          "$ref": "#/definitions/v1RoundFinalizedEvent"
+        },
+        "roundFailed": {
+          "$ref": "#/definitions/v1RoundFailed"
+        }
+      }
+    },
+    "v1GetInfoResponse": {
+      "type": "object",
+      "properties": {
+        "pubkey": {
+          "type": "string"
+        },
+        "roundLifetime": {
+          "type": "string",
+          "format": "int64"
+        },
+        "unilateralExitDelay": {
+          "type": "string",
+          "format": "int64"
+        },
+        "roundInterval": {
+          "type": "string",
+          "format": "int64"
+        },
+        "network": {
+          "type": "string"
+        },
+        "minRelayFee": {
+          "type": "string",
+          "format": "int64"
+        }
+      }
+    },
+    "v1GetRoundByIdResponse": {
+      "type": "object",
+      "properties": {
+        "round": {
+          "$ref": "#/definitions/v1Round"
+        }
+      }
+    },
+    "v1GetRoundResponse": {
+      "type": "object",
+      "properties": {
+        "round": {
+          "$ref": "#/definitions/v1Round"
+        }
+      }
+    },
+    "v1Input": {
+      "type": "object",
+      "properties": {
+        "txid": {
+          "type": "string"
+        },
+        "vout": {
+          "type": "integer",
+          "format": "int64"
+        }
+      }
+    },
+    "v1ListVtxosResponse": {
+      "type": "object",
+      "properties": {
+        "spendableVtxos": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/v1Vtxo"
+          }
+        },
+        "spentVtxos": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/v1Vtxo"
+          }
+        }
+      }
+    },
+    "v1Node": {
+      "type": "object",
+      "properties": {
+        "txid": {
+          "type": "string"
+        },
+        "tx": {
+          "type": "string"
+        },
+        "parentTxid": {
+          "type": "string"
+        }
+      }
+    },
+    "v1OnboardRequest": {
+      "type": "object",
+      "properties": {
+        "boardingTx": {
+          "type": "string"
+        },
+        "congestionTree": {
+          "$ref": "#/definitions/v1Tree"
+        },
+        "userPubkey": {
+          "type": "string"
+        }
+      }
+    },
+    "v1OnboardResponse": {
+      "type": "object"
+    },
+    "v1Output": {
+      "type": "object",
+      "properties": {
+        "address": {
+          "type": "string",
+          "description": "Either the offchain or onchain address."
+        },
+        "amount": {
+          "type": "string",
+          "format": "uint64",
+          "description": "Amount to send in satoshis."
+        }
+      }
+    },
+    "v1PingResponse": {
+      "type": "object",
+      "properties": {
+        "forfeitTxs": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "event": {
+          "$ref": "#/definitions/v1RoundFinalizationEvent"
+        }
+      }
+    },
+    "v1RegisterPaymentRequest": {
+      "type": "object",
+      "properties": {
+        "inputs": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/v1Input"
+          }
+        }
+      }
+    },
+    "v1RegisterPaymentResponse": {
+      "type": "object",
+      "properties": {
+        "id": {
+          "type": "string",
+          "description": "Mocks wabisabi's credentials."
+        }
+      }
+    },
+    "v1Round": {
+      "type": "object",
+      "properties": {
+        "id": {
+          "type": "string"
+        },
+        "start": {
+          "type": "string",
+          "format": "int64"
+        },
+        "end": {
+          "type": "string",
+          "format": "int64"
+        },
+        "poolTx": {
+          "type": "string"
+        },
+        "congestionTree": {
+          "$ref": "#/definitions/v1Tree"
+        },
+        "forfeitTxs": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "connectors": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "stage": {
+          "$ref": "#/definitions/v1RoundStage"
+        }
+      }
+    },
+    "v1RoundFailed": {
+      "type": "object",
+      "properties": {
+        "id": {
+          "type": "string"
+        },
+        "reason": {
+          "type": "string"
+        }
+      }
+    },
+    "v1RoundFinalizationEvent": {
+      "type": "object",
+      "properties": {
+        "id": {
+          "type": "string"
+        },
+        "poolTx": {
+          "type": "string"
+        },
+        "forfeitTxs": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "congestionTree": {
+          "$ref": "#/definitions/v1Tree"
+        },
+        "connectors": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        }
+      }
+    },
+    "v1RoundFinalizedEvent": {
+      "type": "object",
+      "properties": {
+        "id": {
+          "type": "string"
+        },
+        "poolTxid": {
+          "type": "string"
+        }
+      }
+    },
+    "v1RoundStage": {
+      "type": "string",
+      "enum": [
+        "ROUND_STAGE_UNSPECIFIED",
+        "ROUND_STAGE_REGISTRATION",
+        "ROUND_STAGE_FINALIZATION",
+        "ROUND_STAGE_FINALIZED",
+        "ROUND_STAGE_FAILED"
+      ],
+      "default": "ROUND_STAGE_UNSPECIFIED"
+    },
+    "v1Tree": {
+      "type": "object",
+      "properties": {
+        "levels": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/v1TreeLevel"
+          }
+        }
+      }
+    },
+    "v1TreeLevel": {
+      "type": "object",
+      "properties": {
+        "nodes": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/v1Node"
+          }
+        }
+      }
+    },
+    "v1Vtxo": {
+      "type": "object",
+      "properties": {
+        "outpoint": {
+          "$ref": "#/definitions/v1Input"
+        },
+        "receiver": {
+          "$ref": "#/definitions/v1Output"
+        },
+        "spent": {
+          "type": "boolean"
+        },
+        "poolTxid": {
+          "type": "string"
+        },
+        "spentBy": {
+          "type": "string"
+        },
+        "expireAt": {
+          "type": "string",
+          "format": "int64"
+        },
+        "swept": {
+          "type": "boolean"
+        }
+      }
+    }
+  }
+}

server/api-spec/protobuf/ark/v1/service.proto

@@ -60,8 +60,35 @@ service ArkService {
       body: "*"
     };
   }
+  rpc CreatePayment(CreatePaymentRequest) returns (CreatePaymentResponse) {
+    option (google.api.http) = {
+      post: "/v1/payment"
+      body: "*"
+    };
+  }
+  rpc CompletePayment(CompletePaymentRequest) returns (CompletePaymentResponse) {
+    option (google.api.http) = {
+      post: "/v1/payment/complete"
+      body: "*"
+    };
+  }
 }
 
+message CreatePaymentRequest {
+  repeated Input inputs = 1;
+  repeated Output outputs = 2;
+}
+message CreatePaymentResponse {
+  string signed_redeem_tx = 1; // signed only by the ASP
+  repeated string usigned_unconditional_forfeit_txs = 2;
+}
+
+message CompletePaymentRequest {
+  string signed_redeem_tx = 1;
+  repeated string signed_unconditional_forfeit_txs = 2;
+}
+message CompletePaymentResponse {}
+
 message RegisterPaymentRequest {
   repeated Input inputs = 1;
 }
@@ -217,4 +244,11 @@ message Vtxo {
   string spent_by = 5;
   int64 expire_at = 6;
   bool swept = 7;
+  bool pending = 8;
+  PendingPayment pending_data = 9;
+}
+
+message PendingPayment {
+  string redeem_tx = 1;
+  repeated string unconditional_forfeit_txs =2;
 }

server/api-spec/protobuf/gen/ark/v1/service.pb.gw.go

@@ -378,6 +378,58 @@ func local_request_ArkService_Onboard_0(ctx context.Context, marshaler runtime.M
 
 }
 
+func request_ArkService_CreatePayment_0(ctx context.Context, marshaler runtime.Marshaler, client ArkServiceClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq CreatePaymentRequest
+	var metadata runtime.ServerMetadata
+
+	if err := marshaler.NewDecoder(req.Body).Decode(&protoReq); err != nil && err != io.EOF {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := client.CreatePayment(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
+	return msg, metadata, err
+
+}
+
+func local_request_ArkService_CreatePayment_0(ctx context.Context, marshaler runtime.Marshaler, server ArkServiceServer, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq CreatePaymentRequest
+	var metadata runtime.ServerMetadata
+
+	if err := marshaler.NewDecoder(req.Body).Decode(&protoReq); err != nil && err != io.EOF {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := server.CreatePayment(ctx, &protoReq)
+	return msg, metadata, err
+
+}
+
+func request_ArkService_CompletePayment_0(ctx context.Context, marshaler runtime.Marshaler, client ArkServiceClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq CompletePaymentRequest
+	var metadata runtime.ServerMetadata
+
+	if err := marshaler.NewDecoder(req.Body).Decode(&protoReq); err != nil && err != io.EOF {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := client.CompletePayment(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
+	return msg, metadata, err
+
+}
+
+func local_request_ArkService_CompletePayment_0(ctx context.Context, marshaler runtime.Marshaler, server ArkServiceServer, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq CompletePaymentRequest
+	var metadata runtime.ServerMetadata
+
+	if err := marshaler.NewDecoder(req.Body).Decode(&protoReq); err != nil && err != io.EOF {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := server.CompletePayment(ctx, &protoReq)
+	return msg, metadata, err
+
+}
+
 // RegisterArkServiceHandlerServer registers the http handlers for service ArkService to "mux".
 // UnaryRPC     :call ArkServiceServer directly.
 // StreamingRPC :currently unsupported pending https://github.com/grpc/grpc-go/issues/906.
@@ -617,6 +669,56 @@ func RegisterArkServiceHandlerServer(ctx context.Context, mux *runtime.ServeMux,
 
 	})
 
+	mux.Handle("POST", pattern_ArkService_CreatePayment_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		var stream runtime.ServerTransportStream
+		ctx = grpc.NewContextWithServerTransportStream(ctx, &stream)
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		var err error
+		var annotatedContext context.Context
+		annotatedContext, err = runtime.AnnotateIncomingContext(ctx, mux, req, "/ark.v1.ArkService/CreatePayment", runtime.WithHTTPPathPattern("/v1/payment"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := local_request_ArkService_CreatePayment_0(annotatedContext, inboundMarshaler, server, req, pathParams)
+		md.HeaderMD, md.TrailerMD = metadata.Join(md.HeaderMD, stream.Header()), metadata.Join(md.TrailerMD, stream.Trailer())
+		annotatedContext = runtime.NewServerMetadataContext(annotatedContext, md)
+		if err != nil {
+			runtime.HTTPError(annotatedContext, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_ArkService_CreatePayment_0(annotatedContext, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
+	mux.Handle("POST", pattern_ArkService_CompletePayment_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		var stream runtime.ServerTransportStream
+		ctx = grpc.NewContextWithServerTransportStream(ctx, &stream)
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		var err error
+		var annotatedContext context.Context
+		annotatedContext, err = runtime.AnnotateIncomingContext(ctx, mux, req, "/ark.v1.ArkService/CompletePayment", runtime.WithHTTPPathPattern("/v1/payment/complete"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := local_request_ArkService_CompletePayment_0(annotatedContext, inboundMarshaler, server, req, pathParams)
+		md.HeaderMD, md.TrailerMD = metadata.Join(md.HeaderMD, stream.Header()), metadata.Join(md.TrailerMD, stream.Trailer())
+		annotatedContext = runtime.NewServerMetadataContext(annotatedContext, md)
+		if err != nil {
+			runtime.HTTPError(annotatedContext, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_ArkService_CompletePayment_0(annotatedContext, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
 	return nil
 }
 
@@ -878,6 +980,50 @@ func RegisterArkServiceHandlerClient(ctx context.Context, mux *runtime.ServeMux,
 
 	})
 
+	mux.Handle("POST", pattern_ArkService_CreatePayment_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		var err error
+		var annotatedContext context.Context
+		annotatedContext, err = runtime.AnnotateContext(ctx, mux, req, "/ark.v1.ArkService/CreatePayment", runtime.WithHTTPPathPattern("/v1/payment"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := request_ArkService_CreatePayment_0(annotatedContext, inboundMarshaler, client, req, pathParams)
+		annotatedContext = runtime.NewServerMetadataContext(annotatedContext, md)
+		if err != nil {
+			runtime.HTTPError(annotatedContext, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_ArkService_CreatePayment_0(annotatedContext, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
+	mux.Handle("POST", pattern_ArkService_CompletePayment_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		var err error
+		var annotatedContext context.Context
+		annotatedContext, err = runtime.AnnotateContext(ctx, mux, req, "/ark.v1.ArkService/CompletePayment", runtime.WithHTTPPathPattern("/v1/payment/complete"))
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := request_ArkService_CompletePayment_0(annotatedContext, inboundMarshaler, client, req, pathParams)
+		annotatedContext = runtime.NewServerMetadataContext(annotatedContext, md)
+		if err != nil {
+			runtime.HTTPError(annotatedContext, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_ArkService_CompletePayment_0(annotatedContext, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
 	return nil
 }
 
@@ -901,6 +1047,10 @@ var (
 	pattern_ArkService_GetInfo_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1}, []string{"v1", "info"}, ""))
 
 	pattern_ArkService_Onboard_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1}, []string{"v1", "onboard"}, ""))
+
+	pattern_ArkService_CreatePayment_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1}, []string{"v1", "payment"}, ""))
+
+	pattern_ArkService_CompletePayment_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2}, []string{"v1", "payment", "complete"}, ""))
 )
 
 var (
@@ -923,4 +1073,8 @@ var (
 	forward_ArkService_GetInfo_0 = runtime.ForwardResponseMessage
 
 	forward_ArkService_Onboard_0 = runtime.ForwardResponseMessage
+
+	forward_ArkService_CreatePayment_0 = runtime.ForwardResponseMessage
+
+	forward_ArkService_CompletePayment_0 = runtime.ForwardResponseMessage
 )

server/api-spec/protobuf/gen/ark/v1/service_grpc.pb.go

@@ -29,6 +29,8 @@ type ArkServiceClient interface {
 	ListVtxos(ctx context.Context, in *ListVtxosRequest, opts ...grpc.CallOption) (*ListVtxosResponse, error)
 	GetInfo(ctx context.Context, in *GetInfoRequest, opts ...grpc.CallOption) (*GetInfoResponse, error)
 	Onboard(ctx context.Context, in *OnboardRequest, opts ...grpc.CallOption) (*OnboardResponse, error)
+	CreatePayment(ctx context.Context, in *CreatePaymentRequest, opts ...grpc.CallOption) (*CreatePaymentResponse, error)
+	CompletePayment(ctx context.Context, in *CompletePaymentRequest, opts ...grpc.CallOption) (*CompletePaymentResponse, error)
 }
 
 type arkServiceClient struct {
@@ -152,6 +154,24 @@ func (c *arkServiceClient) Onboard(ctx context.Context, in *OnboardRequest, opts
 	return out, nil
 }
 
+func (c *arkServiceClient) CreatePayment(ctx context.Context, in *CreatePaymentRequest, opts ...grpc.CallOption) (*CreatePaymentResponse, error) {
+	out := new(CreatePaymentResponse)
+	err := c.cc.Invoke(ctx, "/ark.v1.ArkService/CreatePayment", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *arkServiceClient) CompletePayment(ctx context.Context, in *CompletePaymentRequest, opts ...grpc.CallOption) (*CompletePaymentResponse, error) {
+	out := new(CompletePaymentResponse)
+	err := c.cc.Invoke(ctx, "/ark.v1.ArkService/CompletePayment", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // ArkServiceServer is the server API for ArkService service.
 // All implementations should embed UnimplementedArkServiceServer
 // for forward compatibility
@@ -167,6 +187,8 @@ type ArkServiceServer interface {
 	ListVtxos(context.Context, *ListVtxosRequest) (*ListVtxosResponse, error)
 	GetInfo(context.Context, *GetInfoRequest) (*GetInfoResponse, error)
 	Onboard(context.Context, *OnboardRequest) (*OnboardResponse, error)
+	CreatePayment(context.Context, *CreatePaymentRequest) (*CreatePaymentResponse, error)
+	CompletePayment(context.Context, *CompletePaymentRequest) (*CompletePaymentResponse, error)
 }
 
 // UnimplementedArkServiceServer should be embedded to have forward compatible implementations.
@@ -203,6 +225,12 @@ func (UnimplementedArkServiceServer) GetInfo(context.Context, *GetInfoRequest) (
 func (UnimplementedArkServiceServer) Onboard(context.Context, *OnboardRequest) (*OnboardResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method Onboard not implemented")
 }
+func (UnimplementedArkServiceServer) CreatePayment(context.Context, *CreatePaymentRequest) (*CreatePaymentResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method CreatePayment not implemented")
+}
+func (UnimplementedArkServiceServer) CompletePayment(context.Context, *CompletePaymentRequest) (*CompletePaymentResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method CompletePayment not implemented")
+}
 
 // UnsafeArkServiceServer may be embedded to opt out of forward compatibility for this service.
 // Use of this interface is not recommended, as added methods to ArkServiceServer will
@@ -398,6 +426,42 @@ func _ArkService_Onboard_Handler(srv interface{}, ctx context.Context, dec func(
 	return interceptor(ctx, in, info, handler)
 }
 
+func _ArkService_CreatePayment_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(CreatePaymentRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ArkServiceServer).CreatePayment(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/ark.v1.ArkService/CreatePayment",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ArkServiceServer).CreatePayment(ctx, req.(*CreatePaymentRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _ArkService_CompletePayment_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(CompletePaymentRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ArkServiceServer).CompletePayment(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/ark.v1.ArkService/CompletePayment",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ArkServiceServer).CompletePayment(ctx, req.(*CompletePaymentRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // ArkService_ServiceDesc is the grpc.ServiceDesc for ArkService service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -441,6 +505,14 @@ var ArkService_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "Onboard",
 			Handler:    _ArkService_Onboard_Handler,
 		},
+		{
+			MethodName: "CreatePayment",
+			Handler:    _ArkService_CreatePayment_Handler,
+		},
+		{
+			MethodName: "CompletePayment",
+			Handler:    _ArkService_CompletePayment_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{

server/cmd/arkd/commands.go

@@ -220,7 +220,7 @@ func post[T any](url, body, key, macaroon, tlsCert string) (result T, err error)
 		req.Header.Add("X-Macaroon", macaroon)
 	}
 	client := &http.Client{
-		Timeout: 15 * time.Second,
+		Timeout: 30 * time.Second,
 		Transport: &http.Transport{
 			TLSClientConfig: tlsConfig,
 		},
@@ -267,7 +267,7 @@ func get[T any](url, key, macaroon, tlsCert string) (result T, err error) {
 	}
 
 	client := &http.Client{
-		Timeout: 15 * time.Second,
+		Timeout: 30 * time.Second,
 		Transport: &http.Transport{
 			TLSClientConfig: tlsConfig,
 		},
@@ -331,7 +331,7 @@ func getBalance(url, macaroon, tlsCert string) (*balance, error) {
 		req.Header.Add("X-Macaroon", macaroon)
 	}
 	client := &http.Client{
-		Timeout: 15 * time.Second,
+		Timeout: 30 * time.Second,
 		Transport: &http.Transport{
 			TLSClientConfig: tlsConfig,
 		},
@@ -384,7 +384,7 @@ func getStatus(url, tlsCert string) (*status, error) {
 	req.Header.Add("Content-Type", "application/json")
 
 	client := &http.Client{
-		Timeout: 15 * time.Second,
+		Timeout: 30 * time.Second,
 		Transport: &http.Transport{
 			TLSClientConfig: tlsConfig,
 		},

server/internal/core/application/admin.go

@@ -45,6 +45,8 @@ type AdminService interface {
 	GetScheduledSweeps(ctx context.Context) ([]ScheduledSweep, error)
 	GetRoundDetails(ctx context.Context, roundId string) (*RoundDetails, error)
 	GetRounds(ctx context.Context, after int64, before int64) ([]string, error)
+	GetWalletAddress(ctx context.Context) (string, error)
+	GetWalletStatus(ctx context.Context) (*WalletStatus, error)
 }
 
 type adminService struct {
@@ -154,3 +156,24 @@ func (a *adminService) GetScheduledSweeps(ctx context.Context) ([]ScheduledSweep
 
 	return scheduledSweeps, nil
 }
+
+func (a *adminService) GetWalletAddress(ctx context.Context) (string, error) {
+	addresses, err := a.walletSvc.DeriveAddresses(ctx, 1)
+	if err != nil {
+		return "", err
+	}
+
+	return addresses[0], nil
+}
+
+func (a *adminService) GetWalletStatus(ctx context.Context) (*WalletStatus, error) {
+	status, err := a.walletSvc.Status(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return &WalletStatus{
+		IsInitialized: status.IsInitialized(),
+		IsUnlocked:    status.IsUnlocked(),
+		IsSynced:      status.IsSynced(),
+	}, nil
+}

server/internal/core/application/covenant.go

@@ -161,6 +161,14 @@ func (s *covenantService) UpdatePaymentStatus(_ context.Context, id string) ([]s
 	return nil, nil, nil
 }
 
+func (s *covenantService) CompleteAsyncPayment(ctx context.Context, redeemTx string, unconditionalForfeitTxs []string) error {
+	return fmt.Errorf("unimplemented")
+}
+
+func (s *covenantService) CreateAsyncPayment(ctx context.Context, inputs []domain.VtxoKey, receivers []domain.Receiver) (string, []string, error) {
+	return "", nil, fmt.Errorf("unimplemented")
+}
+
 func (s *covenantService) SignVtxos(ctx context.Context, forfeitTxs []string) error {
 	return s.forfeitTxs.sign(forfeitTxs)
 }

server/internal/core/application/covenantless.go

@@ -42,6 +42,11 @@ type covenantlessService struct {
 	onboardingCh chan onboarding
 
 	currentRound *domain.Round
+
+	asyncPaymentsCache map[domain.VtxoKey]struct {
+		receivers []domain.Receiver
+		expireAt  int64
+	}
 }
 
 func NewCovenantlessService(
@@ -62,13 +67,30 @@ func NewCovenantlessService(
 	}
 
 	sweeper := newSweeper(walletSvc, repoManager, builder, scheduler)
+	asyncPaymentsCache := make(map[domain.VtxoKey]struct {
+		receivers []domain.Receiver
+		expireAt  int64
+	})
 
 	svc := &covenantlessService{
-		network, pubkey,
-		roundLifetime, roundInterval, unilateralExitDelay, minRelayFee,
-		walletSvc, repoManager, builder, scanner, sweeper,
-		paymentRequests, forfeitTxs, eventsCh, onboardingCh, nil,
+		network:             network,
+		pubkey:              pubkey,
+		roundLifetime:       roundLifetime,
+		roundInterval:       roundInterval,
+		unilateralExitDelay: unilateralExitDelay,
+		minRelayFee:         minRelayFee,
+		wallet:              walletSvc,
+		repoManager:         repoManager,
+		builder:             builder,
+		scanner:             scanner,
+		sweeper:             sweeper,
+		paymentRequests:     paymentRequests,
+		forfeitTxs:          forfeitTxs,
+		eventsCh:            eventsCh,
+		onboardingCh:        onboardingCh,
+		asyncPaymentsCache:  asyncPaymentsCache,
 	}
+
 	repoManager.RegisterEventsHandler(
 		func(round *domain.Round) {
 			go svc.propagateEvents(round)
@@ -115,6 +137,108 @@ func (s *covenantlessService) Stop() {
 	close(s.onboardingCh)
 }
 
+func (s *covenantlessService) CompleteAsyncPayment(
+	ctx context.Context, redeemTx string, unconditionalForfeitTxs []string,
+) error {
+	// TODO check that the user signed both transactions
+
+	redeemPtx, err := psbt.NewFromRawBytes(strings.NewReader(redeemTx), true)
+	if err != nil {
+		return fmt.Errorf("failed to parse redeem tx: %s", err)
+	}
+	redeemTxid := redeemPtx.UnsignedTx.TxID()
+
+	spentVtxos := make([]domain.VtxoKey, 0, len(unconditionalForfeitTxs))
+	for _, in := range redeemPtx.UnsignedTx.TxIn {
+		spentVtxos = append(spentVtxos, domain.VtxoKey{
+			Txid: in.PreviousOutPoint.Hash.String(),
+			VOut: in.PreviousOutPoint.Index,
+		})
+	}
+
+	asyncPayData, ok := s.asyncPaymentsCache[spentVtxos[0]]
+	if !ok {
+		return fmt.Errorf("async payment not found")
+	}
+
+	vtxos := make([]domain.Vtxo, 0, len(asyncPayData.receivers))
+	for i, receiver := range asyncPayData.receivers {
+		vtxos = append(vtxos, domain.Vtxo{
+			VtxoKey: domain.VtxoKey{
+				Txid: redeemTxid,
+				VOut: uint32(i),
+			},
+			Receiver: receiver,
+			ExpireAt: asyncPayData.expireAt,
+			AsyncPayment: &domain.AsyncPaymentTxs{
+				RedeemTx:                redeemTx,
+				UnconditionalForfeitTxs: unconditionalForfeitTxs,
+			},
+		})
+	}
+
+	if err := s.repoManager.Vtxos().AddVtxos(ctx, vtxos); err != nil {
+		return fmt.Errorf("failed to add vtxos: %s", err)
+	}
+	log.Infof("added %d vtxos", len(vtxos))
+
+	if err := s.repoManager.Vtxos().SpendVtxos(ctx, spentVtxos, redeemTxid); err != nil {
+		return fmt.Errorf("failed to spend vtxo: %s", err)
+	}
+	log.Infof("spent %d vtxos", len(spentVtxos))
+
+	delete(s.asyncPaymentsCache, spentVtxos[0])
+
+	return nil
+}
+
+func (s *covenantlessService) CreateAsyncPayment(
+	ctx context.Context, inputs []domain.VtxoKey, receivers []domain.Receiver,
+) (string, []string, error) {
+	vtxos, err := s.repoManager.Vtxos().GetVtxos(ctx, inputs)
+	if err != nil {
+		return "", nil, err
+	}
+	if len(vtxos) <= 0 {
+		return "", nil, fmt.Errorf("vtxos not found")
+	}
+
+	expiration := vtxos[0].ExpireAt
+	for _, vtxo := range vtxos {
+		if vtxo.Spent {
+			return "", nil, fmt.Errorf("all vtxos must be unspent")
+		}
+
+		if vtxo.Redeemed {
+			return "", nil, fmt.Errorf("all vtxos must be redeemed")
+		}
+
+		if vtxo.Swept {
+			return "", nil, fmt.Errorf("all vtxos must be swept")
+		}
+		if vtxo.ExpireAt < expiration {
+			expiration = vtxo.ExpireAt
+		}
+	}
+
+	res, err := s.builder.BuildAsyncPaymentTransactions(
+		vtxos, s.pubkey, receivers, s.minRelayFee,
+	)
+	if err != nil {
+		return "", nil, fmt.Errorf("failed to build async payment txs: %s", err)
+	}
+
+	s.asyncPaymentsCache[inputs[0]] = struct {
+		receivers []domain.Receiver
+		expireAt  int64
+	}{
+		receivers: receivers,
+		expireAt:  expiration,
+	}
+
+	return res.RedeemTx, res.UnconditionalForfeitTxs, nil
+}
+
 func (s *covenantlessService) SpendVtxos(ctx context.Context, inputs []domain.VtxoKey) (string, error) {
 	vtxos, err := s.repoManager.Vtxos().GetVtxos(ctx, inputs)
 	if err != nil {

server/internal/core/application/sweeper.go

@@ -149,6 +149,7 @@ func (s *sweeper) createTask(
 			for _, input := range inputs {
 				// sweepableVtxos related to the sweep input
 				sweepableVtxos := make([]domain.VtxoKey, 0)
+				fmt.Println("input", input.GetHash().String(), input.GetIndex())
 
 				// check if input is the vtxo itself
 				vtxos, _ := s.repoManager.Vtxos().GetVtxos(

server/internal/core/application/types.go

@@ -34,6 +34,13 @@ type Service interface {
 		ctx context.Context, boardingTx string,
 		congestionTree tree.CongestionTree, userPubkey *secp256k1.PublicKey,
 	) error
+	// Async payments
+	CreateAsyncPayment(
+		ctx context.Context, inputs []domain.VtxoKey, receivers []domain.Receiver,
+	) (string, []string, error)
+	CompleteAsyncPayment(
+		ctx context.Context, redeemTx string, unconditionalForfeitTxs []string,
+	) error
 }
 
 type ServiceInfo struct {

server/internal/core/domain/payment.go

@@ -130,10 +130,16 @@ func (r Receiver) IsOnchain() bool {
 type Vtxo struct {
 	VtxoKey
 	Receiver
-	PoolTx   string
-	SpentBy  string
-	Spent    bool
-	Redeemed bool
-	Swept    bool
-	ExpireAt int64
+	PoolTx       string
+	SpentBy      string // round txid or async redeem txid
+	Spent        bool
+	Redeemed     bool
+	Swept        bool
+	ExpireAt     int64
+	AsyncPayment *AsyncPaymentTxs // nil if not async vtxo
+}
+
+type AsyncPaymentTxs struct {
+	RedeemTx                string // always signed by the ASP when created
+	UnconditionalForfeitTxs []string
 }

server/internal/core/ports/tx_builder.go

@@ -29,4 +29,8 @@ type TxBuilder interface {
 	FinalizeAndExtractForfeit(tx string) (txhex string, err error)
 	// FindLeaves returns all the leaves txs that are reachable from the given outpoint
 	FindLeaves(congestionTree tree.CongestionTree, fromtxid string, vout uint32) (leaves []tree.Node, err error)
+	BuildAsyncPaymentTransactions(
+		vtxosToSpend []domain.Vtxo,
+		aspPubKey *secp256k1.PublicKey, receivers []domain.Receiver, minRelayFee uint64,
+	) (*domain.AsyncPaymentTxs, error)
 }

server/internal/core/ports/wallet.go

@@ -28,7 +28,7 @@ type WalletService interface {
 	SelectUtxos(ctx context.Context, asset string, amount uint64) ([]TxInput, uint64, error)
 	BroadcastTransaction(ctx context.Context, txHex string) (string, error)
 	WaitForSync(ctx context.Context, txid string) error
-	EstimateFees(ctx context.Context, pset string) (uint64, error)
+	EstimateFees(ctx context.Context, psbt string) (uint64, error)
 	ListConnectorUtxos(ctx context.Context, connectorAddress string) ([]TxInput, error)
 	MainAccountBalance(ctx context.Context) (uint64, uint64, error)
 	ConnectorsAccountBalance(ctx context.Context) (uint64, uint64, error)

server/internal/infrastructure/db/sqlite/migration/20240703120550_init.up.sql

@@ -41,8 +41,17 @@ CREATE TABLE IF NOT EXISTS tx (
     FOREIGN KEY (round_id) REFERENCES round(id)
 );
 
+CREATE TABLE IF NOT EXISTS uncond_forfeit_tx (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    tx TEXT NOT NULL,
+    vtxo_txid TEXT NOT NULL,
+    vtxo_vout INTEGER NOT NULL,
+    position INTEGER NOT NULL,
+    FOREIGN KEY (vtxo_txid, vtxo_vout) REFERENCES vtxo(txid, vout)
+);
+
 CREATE TABLE IF NOT EXISTS vtxo (
-	txid TEXT NOT NULL PRIMARY KEY,
+	txid TEXT NOT NULL,
 	vout INTEGER NOT NULL,
 	pubkey TEXT NOT NULL,
 	amount INTEGER NOT NULL,
@@ -53,6 +62,8 @@ CREATE TABLE IF NOT EXISTS vtxo (
 	swept BOOLEAN NOT NULL,
 	expire_at INTEGER NOT NULL,
 	payment_id TEXT,
+    redeem_tx TEXT,
+    PRIMARY KEY (txid, vout),
 	FOREIGN KEY (payment_id) REFERENCES payment(id)
 );
 
@@ -74,4 +85,9 @@ ON payment.id=receiver.payment_id;
 CREATE VIEW payment_vtxo_vw AS SELECT vtxo.*
 FROM payment
 LEFT OUTER JOIN vtxo
-ON payment.id=vtxo.payment_id;
+ON payment.id=vtxo.payment_id;
+
+CREATE VIEW uncond_forfeit_tx_vw AS SELECT uncond_forfeit_tx.*
+FROM vtxo
+LEFT OUTER JOIN uncond_forfeit_tx
+ON vtxo.txid=uncond_forfeit_tx.vtxo_txid AND vtxo.vout=uncond_forfeit_tx.vtxo_vout;

server/internal/infrastructure/db/sqlite/sqlc/queries/db.go

@@ -1,6 +1,6 @@
 // Code generated by sqlc. DO NOT EDIT.
 // versions:
-//   sqlc v1.26.0
+//   sqlc v1.27.0
 
 package queries
 

server/internal/infrastructure/db/sqlite/sqlc/queries/models.go

@@ -1,6 +1,6 @@
 // Code generated by sqlc. DO NOT EDIT.
 // versions:
-//   sqlc v1.26.0
+//   sqlc v1.27.0
 
 package queries
 
@@ -32,6 +32,7 @@ type PaymentVtxoVw struct {
 	Swept     sql.NullBool
 	ExpireAt  sql.NullInt64
 	PaymentID sql.NullString
+	RedeemTx  sql.NullString
 }
 
 type Receiver struct {
@@ -85,6 +86,22 @@ type Tx struct {
 	IsLeaf     sql.NullBool
 }
 
+type UncondForfeitTx struct {
+	ID       int64
+	Tx       string
+	VtxoTxid string
+	VtxoVout int64
+	Position int64
+}
+
+type UncondForfeitTxVw struct {
+	ID       sql.NullInt64
+	Tx       sql.NullString
+	VtxoTxid sql.NullString
+	VtxoVout sql.NullInt64
+	Position sql.NullInt64
+}
+
 type Vtxo struct {
 	Txid      string
 	Vout      int64
@@ -97,4 +114,5 @@ type Vtxo struct {
 	Swept     bool
 	ExpireAt  int64
 	PaymentID sql.NullString
+	RedeemTx  sql.NullString
 }

server/internal/infrastructure/db/sqlite/sqlc/queries/query.sql.go

@@ -1,6 +1,6 @@
 // Code generated by sqlc. DO NOT EDIT.
 // versions:
-//   sqlc v1.26.0
+//   sqlc v1.27.0
 // source: query.sql
 
 package queries
@@ -54,30 +54,45 @@ func (q *Queries) MarkVtxoAsSwept(ctx context.Context, arg MarkVtxoAsSweptParams
 }
 
 const selectNotRedeemedVtxos = `-- name: SelectNotRedeemedVtxos :many
-SELECT txid, vout, pubkey, amount, pool_tx, spent_by, spent, redeemed, swept, expire_at, payment_id FROM vtxo WHERE redeemed = false
+SELECT  vtxo.txid, vtxo.vout, vtxo.pubkey, vtxo.amount, vtxo.pool_tx, vtxo.spent_by, vtxo.spent, vtxo.redeemed, vtxo.swept, vtxo.expire_at, vtxo.payment_id, vtxo.redeem_tx,
+        uncond_forfeit_tx_vw.id, uncond_forfeit_tx_vw.tx, uncond_forfeit_tx_vw.vtxo_txid, uncond_forfeit_tx_vw.vtxo_vout, uncond_forfeit_tx_vw.position
+FROM vtxo
+        LEFT OUTER JOIN uncond_forfeit_tx_vw ON vtxo.txid=uncond_forfeit_tx_vw.vtxo_txid AND vtxo.vout=uncond_forfeit_tx_vw.vtxo_vout
+WHERE redeemed = false
 `
 
-func (q *Queries) SelectNotRedeemedVtxos(ctx context.Context) ([]Vtxo, error) {
+type SelectNotRedeemedVtxosRow struct {
+	Vtxo              Vtxo
+	UncondForfeitTxVw UncondForfeitTxVw
+}
+
+func (q *Queries) SelectNotRedeemedVtxos(ctx context.Context) ([]SelectNotRedeemedVtxosRow, error) {
 	rows, err := q.db.QueryContext(ctx, selectNotRedeemedVtxos)
 	if err != nil {
 		return nil, err
 	}
 	defer rows.Close()
-	var items []Vtxo
+	var items []SelectNotRedeemedVtxosRow
 	for rows.Next() {
-		var i Vtxo
+		var i SelectNotRedeemedVtxosRow
 		if err := rows.Scan(
-			&i.Txid,
-			&i.Vout,
-			&i.Pubkey,
-			&i.Amount,
-			&i.PoolTx,
-			&i.SpentBy,
-			&i.Spent,
-			&i.Redeemed,
-			&i.Swept,
-			&i.ExpireAt,
-			&i.PaymentID,
+			&i.Vtxo.Txid,
+			&i.Vtxo.Vout,
+			&i.Vtxo.Pubkey,
+			&i.Vtxo.Amount,
+			&i.Vtxo.PoolTx,
+			&i.Vtxo.SpentBy,
+			&i.Vtxo.Spent,
+			&i.Vtxo.Redeemed,
+			&i.Vtxo.Swept,
+			&i.Vtxo.ExpireAt,
+			&i.Vtxo.PaymentID,
+			&i.Vtxo.RedeemTx,
+			&i.UncondForfeitTxVw.ID,
+			&i.UncondForfeitTxVw.Tx,
+			&i.UncondForfeitTxVw.VtxoTxid,
+			&i.UncondForfeitTxVw.VtxoVout,
+			&i.UncondForfeitTxVw.Position,
 		); err != nil {
 			return nil, err
 		}
@@ -93,30 +108,45 @@ func (q *Queries) SelectNotRedeemedVtxos(ctx context.Context) ([]Vtxo, error) {
 }
 
 const selectNotRedeemedVtxosWithPubkey = `-- name: SelectNotRedeemedVtxosWithPubkey :many
-SELECT txid, vout, pubkey, amount, pool_tx, spent_by, spent, redeemed, swept, expire_at, payment_id FROM vtxo WHERE redeemed = false AND pubkey = ?
+SELECT  vtxo.txid, vtxo.vout, vtxo.pubkey, vtxo.amount, vtxo.pool_tx, vtxo.spent_by, vtxo.spent, vtxo.redeemed, vtxo.swept, vtxo.expire_at, vtxo.payment_id, vtxo.redeem_tx,
+        uncond_forfeit_tx_vw.id, uncond_forfeit_tx_vw.tx, uncond_forfeit_tx_vw.vtxo_txid, uncond_forfeit_tx_vw.vtxo_vout, uncond_forfeit_tx_vw.position
+FROM vtxo
+        LEFT OUTER JOIN uncond_forfeit_tx_vw ON vtxo.txid=uncond_forfeit_tx_vw.vtxo_txid AND vtxo.vout=uncond_forfeit_tx_vw.vtxo_vout
+WHERE redeemed = false AND pubkey = ?
 `
 
-func (q *Queries) SelectNotRedeemedVtxosWithPubkey(ctx context.Context, pubkey string) ([]Vtxo, error) {
+type SelectNotRedeemedVtxosWithPubkeyRow struct {
+	Vtxo              Vtxo
+	UncondForfeitTxVw UncondForfeitTxVw
+}
+
+func (q *Queries) SelectNotRedeemedVtxosWithPubkey(ctx context.Context, pubkey string) ([]SelectNotRedeemedVtxosWithPubkeyRow, error) {
 	rows, err := q.db.QueryContext(ctx, selectNotRedeemedVtxosWithPubkey, pubkey)
 	if err != nil {
 		return nil, err
 	}
 	defer rows.Close()
-	var items []Vtxo
+	var items []SelectNotRedeemedVtxosWithPubkeyRow
 	for rows.Next() {
-		var i Vtxo
+		var i SelectNotRedeemedVtxosWithPubkeyRow
 		if err := rows.Scan(
-			&i.Txid,
-			&i.Vout,
-			&i.Pubkey,
-			&i.Amount,
-			&i.PoolTx,
-			&i.SpentBy,
-			&i.Spent,
-			&i.Redeemed,
-			&i.Swept,
-			&i.ExpireAt,
-			&i.PaymentID,
+			&i.Vtxo.Txid,
+			&i.Vtxo.Vout,
+			&i.Vtxo.Pubkey,
+			&i.Vtxo.Amount,
+			&i.Vtxo.PoolTx,
+			&i.Vtxo.SpentBy,
+			&i.Vtxo.Spent,
+			&i.Vtxo.Redeemed,
+			&i.Vtxo.Swept,
+			&i.Vtxo.ExpireAt,
+			&i.Vtxo.PaymentID,
+			&i.Vtxo.RedeemTx,
+			&i.UncondForfeitTxVw.ID,
+			&i.UncondForfeitTxVw.Tx,
+			&i.UncondForfeitTxVw.VtxoTxid,
+			&i.UncondForfeitTxVw.VtxoVout,
+			&i.UncondForfeitTxVw.Position,
 		); err != nil {
 			return nil, err
 		}
@@ -195,7 +225,7 @@ SELECT round.id, round.starting_timestamp, round.ending_timestamp, round.ended,
        round_payment_vw.id, round_payment_vw.round_id,
        round_tx_vw.id, round_tx_vw.tx, round_tx_vw.round_id, round_tx_vw.type, round_tx_vw.position, round_tx_vw.txid, round_tx_vw.tree_level, round_tx_vw.parent_txid, round_tx_vw.is_leaf,
        payment_receiver_vw.payment_id, payment_receiver_vw.pubkey, payment_receiver_vw.amount, payment_receiver_vw.onchain_address,
-       payment_vtxo_vw.txid, payment_vtxo_vw.vout, payment_vtxo_vw.pubkey, payment_vtxo_vw.amount, payment_vtxo_vw.pool_tx, payment_vtxo_vw.spent_by, payment_vtxo_vw.spent, payment_vtxo_vw.redeemed, payment_vtxo_vw.swept, payment_vtxo_vw.expire_at, payment_vtxo_vw.payment_id
+       payment_vtxo_vw.txid, payment_vtxo_vw.vout, payment_vtxo_vw.pubkey, payment_vtxo_vw.amount, payment_vtxo_vw.pool_tx, payment_vtxo_vw.spent_by, payment_vtxo_vw.spent, payment_vtxo_vw.redeemed, payment_vtxo_vw.swept, payment_vtxo_vw.expire_at, payment_vtxo_vw.payment_id, payment_vtxo_vw.redeem_tx
 FROM round
          LEFT OUTER JOIN round_payment_vw ON round.id=round_payment_vw.round_id
          LEFT OUTER JOIN round_tx_vw ON round.id=round_tx_vw.round_id
@@ -260,6 +290,7 @@ func (q *Queries) SelectRoundWithRoundId(ctx context.Context, id string) ([]Sele
 			&i.PaymentVtxoVw.Swept,
 			&i.PaymentVtxoVw.ExpireAt,
 			&i.PaymentVtxoVw.PaymentID,
+			&i.PaymentVtxoVw.RedeemTx,
 		); err != nil {
 			return nil, err
 		}
@@ -279,7 +310,7 @@ SELECT round.id, round.starting_timestamp, round.ending_timestamp, round.ended,
        round_payment_vw.id, round_payment_vw.round_id,
        round_tx_vw.id, round_tx_vw.tx, round_tx_vw.round_id, round_tx_vw.type, round_tx_vw.position, round_tx_vw.txid, round_tx_vw.tree_level, round_tx_vw.parent_txid, round_tx_vw.is_leaf,
        payment_receiver_vw.payment_id, payment_receiver_vw.pubkey, payment_receiver_vw.amount, payment_receiver_vw.onchain_address,
-       payment_vtxo_vw.txid, payment_vtxo_vw.vout, payment_vtxo_vw.pubkey, payment_vtxo_vw.amount, payment_vtxo_vw.pool_tx, payment_vtxo_vw.spent_by, payment_vtxo_vw.spent, payment_vtxo_vw.redeemed, payment_vtxo_vw.swept, payment_vtxo_vw.expire_at, payment_vtxo_vw.payment_id
+       payment_vtxo_vw.txid, payment_vtxo_vw.vout, payment_vtxo_vw.pubkey, payment_vtxo_vw.amount, payment_vtxo_vw.pool_tx, payment_vtxo_vw.spent_by, payment_vtxo_vw.spent, payment_vtxo_vw.redeemed, payment_vtxo_vw.swept, payment_vtxo_vw.expire_at, payment_vtxo_vw.payment_id, payment_vtxo_vw.redeem_tx
 FROM round
          LEFT OUTER JOIN round_payment_vw ON round.id=round_payment_vw.round_id
          LEFT OUTER JOIN round_tx_vw ON round.id=round_tx_vw.round_id
@@ -344,6 +375,7 @@ func (q *Queries) SelectRoundWithRoundTxId(ctx context.Context, txid string) ([]
 			&i.PaymentVtxoVw.Swept,
 			&i.PaymentVtxoVw.ExpireAt,
 			&i.PaymentVtxoVw.PaymentID,
+			&i.PaymentVtxoVw.RedeemTx,
 		); err != nil {
 			return nil, err
 		}
@@ -363,7 +395,7 @@ SELECT round.id, round.starting_timestamp, round.ending_timestamp, round.ended,
        round_payment_vw.id, round_payment_vw.round_id,
        round_tx_vw.id, round_tx_vw.tx, round_tx_vw.round_id, round_tx_vw.type, round_tx_vw.position, round_tx_vw.txid, round_tx_vw.tree_level, round_tx_vw.parent_txid, round_tx_vw.is_leaf,
        payment_receiver_vw.payment_id, payment_receiver_vw.pubkey, payment_receiver_vw.amount, payment_receiver_vw.onchain_address,
-       payment_vtxo_vw.txid, payment_vtxo_vw.vout, payment_vtxo_vw.pubkey, payment_vtxo_vw.amount, payment_vtxo_vw.pool_tx, payment_vtxo_vw.spent_by, payment_vtxo_vw.spent, payment_vtxo_vw.redeemed, payment_vtxo_vw.swept, payment_vtxo_vw.expire_at, payment_vtxo_vw.payment_id
+       payment_vtxo_vw.txid, payment_vtxo_vw.vout, payment_vtxo_vw.pubkey, payment_vtxo_vw.amount, payment_vtxo_vw.pool_tx, payment_vtxo_vw.spent_by, payment_vtxo_vw.spent, payment_vtxo_vw.redeemed, payment_vtxo_vw.swept, payment_vtxo_vw.expire_at, payment_vtxo_vw.payment_id, payment_vtxo_vw.redeem_tx
 FROM round
          LEFT OUTER JOIN round_payment_vw ON round.id=round_payment_vw.round_id
          LEFT OUTER JOIN round_tx_vw ON round.id=round_tx_vw.round_id
@@ -428,6 +460,7 @@ func (q *Queries) SelectSweepableRounds(ctx context.Context) ([]SelectSweepableR
 			&i.PaymentVtxoVw.Swept,
 			&i.PaymentVtxoVw.ExpireAt,
 			&i.PaymentVtxoVw.PaymentID,
+			&i.PaymentVtxoVw.RedeemTx,
 		); err != nil {
 			return nil, err
 		}
@@ -443,30 +476,45 @@ func (q *Queries) SelectSweepableRounds(ctx context.Context) ([]SelectSweepableR
 }
 
 const selectSweepableVtxos = `-- name: SelectSweepableVtxos :many
-SELECT txid, vout, pubkey, amount, pool_tx, spent_by, spent, redeemed, swept, expire_at, payment_id FROM vtxo WHERE redeemed = false AND swept = false
+SELECT  vtxo.txid, vtxo.vout, vtxo.pubkey, vtxo.amount, vtxo.pool_tx, vtxo.spent_by, vtxo.spent, vtxo.redeemed, vtxo.swept, vtxo.expire_at, vtxo.payment_id, vtxo.redeem_tx,
+        uncond_forfeit_tx_vw.id, uncond_forfeit_tx_vw.tx, uncond_forfeit_tx_vw.vtxo_txid, uncond_forfeit_tx_vw.vtxo_vout, uncond_forfeit_tx_vw.position
+FROM vtxo
+        LEFT OUTER JOIN uncond_forfeit_tx_vw ON vtxo.txid=uncond_forfeit_tx_vw.vtxo_txid AND vtxo.vout=uncond_forfeit_tx_vw.vtxo_vout
+WHERE redeemed = false AND swept = false
 `
 
-func (q *Queries) SelectSweepableVtxos(ctx context.Context) ([]Vtxo, error) {
+type SelectSweepableVtxosRow struct {
+	Vtxo              Vtxo
+	UncondForfeitTxVw UncondForfeitTxVw
+}
+
+func (q *Queries) SelectSweepableVtxos(ctx context.Context) ([]SelectSweepableVtxosRow, error) {
 	rows, err := q.db.QueryContext(ctx, selectSweepableVtxos)
 	if err != nil {
 		return nil, err
 	}
 	defer rows.Close()
-	var items []Vtxo
+	var items []SelectSweepableVtxosRow
 	for rows.Next() {
-		var i Vtxo
+		var i SelectSweepableVtxosRow
 		if err := rows.Scan(
-			&i.Txid,
-			&i.Vout,
-			&i.Pubkey,
-			&i.Amount,
-			&i.PoolTx,
-			&i.SpentBy,
-			&i.Spent,
-			&i.Redeemed,
-			&i.Swept,
-			&i.ExpireAt,
-			&i.PaymentID,
+			&i.Vtxo.Txid,
+			&i.Vtxo.Vout,
+			&i.Vtxo.Pubkey,
+			&i.Vtxo.Amount,
+			&i.Vtxo.PoolTx,
+			&i.Vtxo.SpentBy,
+			&i.Vtxo.Spent,
+			&i.Vtxo.Redeemed,
+			&i.Vtxo.Swept,
+			&i.Vtxo.ExpireAt,
+			&i.Vtxo.PaymentID,
+			&i.Vtxo.RedeemTx,
+			&i.UncondForfeitTxVw.ID,
+			&i.UncondForfeitTxVw.Tx,
+			&i.UncondForfeitTxVw.VtxoTxid,
+			&i.UncondForfeitTxVw.VtxoVout,
+			&i.UncondForfeitTxVw.Position,
 		); err != nil {
 			return nil, err
 		}
@@ -486,7 +534,7 @@ SELECT round.id, round.starting_timestamp, round.ending_timestamp, round.ended,
        round_payment_vw.id, round_payment_vw.round_id,
        round_tx_vw.id, round_tx_vw.tx, round_tx_vw.round_id, round_tx_vw.type, round_tx_vw.position, round_tx_vw.txid, round_tx_vw.tree_level, round_tx_vw.parent_txid, round_tx_vw.is_leaf,
        payment_receiver_vw.payment_id, payment_receiver_vw.pubkey, payment_receiver_vw.amount, payment_receiver_vw.onchain_address,
-       payment_vtxo_vw.txid, payment_vtxo_vw.vout, payment_vtxo_vw.pubkey, payment_vtxo_vw.amount, payment_vtxo_vw.pool_tx, payment_vtxo_vw.spent_by, payment_vtxo_vw.spent, payment_vtxo_vw.redeemed, payment_vtxo_vw.swept, payment_vtxo_vw.expire_at, payment_vtxo_vw.payment_id
+       payment_vtxo_vw.txid, payment_vtxo_vw.vout, payment_vtxo_vw.pubkey, payment_vtxo_vw.amount, payment_vtxo_vw.pool_tx, payment_vtxo_vw.spent_by, payment_vtxo_vw.spent, payment_vtxo_vw.redeemed, payment_vtxo_vw.swept, payment_vtxo_vw.expire_at, payment_vtxo_vw.payment_id, payment_vtxo_vw.redeem_tx
 FROM round
          LEFT OUTER JOIN round_payment_vw ON round.id=round_payment_vw.round_id
          LEFT OUTER JOIN round_tx_vw ON round.id=round_tx_vw.round_id
@@ -551,6 +599,7 @@ func (q *Queries) SelectSweptRounds(ctx context.Context) ([]SelectSweptRoundsRow
 			&i.PaymentVtxoVw.Swept,
 			&i.PaymentVtxoVw.ExpireAt,
 			&i.PaymentVtxoVw.PaymentID,
+			&i.PaymentVtxoVw.RedeemTx,
 		); err != nil {
 			return nil, err
 		}
@@ -566,7 +615,11 @@ func (q *Queries) SelectSweptRounds(ctx context.Context) ([]SelectSweptRoundsRow
 }
 
 const selectVtxoByOutpoint = `-- name: SelectVtxoByOutpoint :one
-SELECT txid, vout, pubkey, amount, pool_tx, spent_by, spent, redeemed, swept, expire_at, payment_id FROM vtxo WHERE txid = ? AND vout = ?
+SELECT  vtxo.txid, vtxo.vout, vtxo.pubkey, vtxo.amount, vtxo.pool_tx, vtxo.spent_by, vtxo.spent, vtxo.redeemed, vtxo.swept, vtxo.expire_at, vtxo.payment_id, vtxo.redeem_tx,
+        uncond_forfeit_tx_vw.id, uncond_forfeit_tx_vw.tx, uncond_forfeit_tx_vw.vtxo_txid, uncond_forfeit_tx_vw.vtxo_vout, uncond_forfeit_tx_vw.position
+FROM vtxo
+        LEFT OUTER JOIN uncond_forfeit_tx_vw ON vtxo.txid=uncond_forfeit_tx_vw.vtxo_txid AND vtxo.vout=uncond_forfeit_tx_vw.vtxo_vout
+WHERE txid = ? AND vout = ?
 `
 
 type SelectVtxoByOutpointParams struct {
@@ -574,50 +627,76 @@ type SelectVtxoByOutpointParams struct {
 	Vout int64
 }
 
-func (q *Queries) SelectVtxoByOutpoint(ctx context.Context, arg SelectVtxoByOutpointParams) (Vtxo, error) {
+type SelectVtxoByOutpointRow struct {
+	Vtxo              Vtxo
+	UncondForfeitTxVw UncondForfeitTxVw
+}
+
+func (q *Queries) SelectVtxoByOutpoint(ctx context.Context, arg SelectVtxoByOutpointParams) (SelectVtxoByOutpointRow, error) {
 	row := q.db.QueryRowContext(ctx, selectVtxoByOutpoint, arg.Txid, arg.Vout)
-	var i Vtxo
+	var i SelectVtxoByOutpointRow
 	err := row.Scan(
-		&i.Txid,
-		&i.Vout,
-		&i.Pubkey,
-		&i.Amount,
-		&i.PoolTx,
-		&i.SpentBy,
-		&i.Spent,
-		&i.Redeemed,
-		&i.Swept,
-		&i.ExpireAt,
-		&i.PaymentID,
+		&i.Vtxo.Txid,
+		&i.Vtxo.Vout,
+		&i.Vtxo.Pubkey,
+		&i.Vtxo.Amount,
+		&i.Vtxo.PoolTx,
+		&i.Vtxo.SpentBy,
+		&i.Vtxo.Spent,
+		&i.Vtxo.Redeemed,
+		&i.Vtxo.Swept,
+		&i.Vtxo.ExpireAt,
+		&i.Vtxo.PaymentID,
+		&i.Vtxo.RedeemTx,
+		&i.UncondForfeitTxVw.ID,
+		&i.UncondForfeitTxVw.Tx,
+		&i.UncondForfeitTxVw.VtxoTxid,
+		&i.UncondForfeitTxVw.VtxoVout,
+		&i.UncondForfeitTxVw.Position,
 	)
 	return i, err
 }
 
 const selectVtxosByPoolTxid = `-- name: SelectVtxosByPoolTxid :many
-SELECT txid, vout, pubkey, amount, pool_tx, spent_by, spent, redeemed, swept, expire_at, payment_id FROM vtxo WHERE pool_tx = ?
+SELECT  vtxo.txid, vtxo.vout, vtxo.pubkey, vtxo.amount, vtxo.pool_tx, vtxo.spent_by, vtxo.spent, vtxo.redeemed, vtxo.swept, vtxo.expire_at, vtxo.payment_id, vtxo.redeem_tx,
+        uncond_forfeit_tx_vw.id, uncond_forfeit_tx_vw.tx, uncond_forfeit_tx_vw.vtxo_txid, uncond_forfeit_tx_vw.vtxo_vout, uncond_forfeit_tx_vw.position
+FROM vtxo
+        LEFT OUTER JOIN uncond_forfeit_tx_vw ON vtxo.txid=uncond_forfeit_tx_vw.vtxo_txid AND vtxo.vout=uncond_forfeit_tx_vw.vtxo_vout
+WHERE pool_tx = ?
 `
 
-func (q *Queries) SelectVtxosByPoolTxid(ctx context.Context, poolTx string) ([]Vtxo, error) {
+type SelectVtxosByPoolTxidRow struct {
+	Vtxo              Vtxo
+	UncondForfeitTxVw UncondForfeitTxVw
+}
+
+func (q *Queries) SelectVtxosByPoolTxid(ctx context.Context, poolTx string) ([]SelectVtxosByPoolTxidRow, error) {
 	rows, err := q.db.QueryContext(ctx, selectVtxosByPoolTxid, poolTx)
 	if err != nil {
 		return nil, err
 	}
 	defer rows.Close()
-	var items []Vtxo
+	var items []SelectVtxosByPoolTxidRow
 	for rows.Next() {
-		var i Vtxo
+		var i SelectVtxosByPoolTxidRow
 		if err := rows.Scan(
-			&i.Txid,
-			&i.Vout,
-			&i.Pubkey,
-			&i.Amount,
-			&i.PoolTx,
-			&i.SpentBy,
-			&i.Spent,
-			&i.Redeemed,
-			&i.Swept,
-			&i.ExpireAt,
-			&i.PaymentID,
+			&i.Vtxo.Txid,
+			&i.Vtxo.Vout,
+			&i.Vtxo.Pubkey,
+			&i.Vtxo.Amount,
+			&i.Vtxo.PoolTx,
+			&i.Vtxo.SpentBy,
+			&i.Vtxo.Spent,
+			&i.Vtxo.Redeemed,
+			&i.Vtxo.Swept,
+			&i.Vtxo.ExpireAt,
+			&i.Vtxo.PaymentID,
+			&i.Vtxo.RedeemTx,
+			&i.UncondForfeitTxVw.ID,
+			&i.UncondForfeitTxVw.Tx,
+			&i.UncondForfeitTxVw.VtxoTxid,
+			&i.UncondForfeitTxVw.VtxoVout,
+			&i.UncondForfeitTxVw.Position,
 		); err != nil {
 			return nil, err
 		}
@@ -803,18 +882,44 @@ func (q *Queries) UpsertTransaction(ctx context.Context, arg UpsertTransactionPa
 	return err
 }
 
+const upsertUnconditionalForfeitTx = `-- name: UpsertUnconditionalForfeitTx :exec
+INSERT INTO uncond_forfeit_tx (tx, vtxo_txid, vtxo_vout, position)
+VALUES (?, ?, ?, ?) ON CONFLICT(id) DO UPDATE SET
+    tx = EXCLUDED.tx,
+    vtxo_txid = EXCLUDED.vtxo_txid,
+    vtxo_vout = EXCLUDED.vtxo_vout,
+    position = EXCLUDED.position
+`
+
+type UpsertUnconditionalForfeitTxParams struct {
+	Tx       string
+	VtxoTxid string
+	VtxoVout int64
+	Position int64
+}
+
+func (q *Queries) UpsertUnconditionalForfeitTx(ctx context.Context, arg UpsertUnconditionalForfeitTxParams) error {
+	_, err := q.db.ExecContext(ctx, upsertUnconditionalForfeitTx,
+		arg.Tx,
+		arg.VtxoTxid,
+		arg.VtxoVout,
+		arg.Position,
+	)
+	return err
+}
+
 const upsertVtxo = `-- name: UpsertVtxo :exec
-INSERT INTO vtxo (txid, vout, pubkey, amount, pool_tx, spent_by, spent, redeemed, swept, expire_at)
-VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?) ON CONFLICT(txid) DO UPDATE SET
-    vout = excluded.vout,
-    pubkey = excluded.pubkey,
-    amount = excluded.amount,
-    pool_tx = excluded.pool_tx,
-    spent_by = excluded.spent_by,
-    spent = excluded.spent,
-    redeemed = excluded.redeemed,
-    swept = excluded.swept,
-    expire_at = excluded.expire_at
+INSERT INTO vtxo (txid, vout, pubkey, amount, pool_tx, spent_by, spent, redeemed, swept, expire_at, redeem_tx)
+VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) ON CONFLICT(txid, vout) DO UPDATE SET
+    pubkey = EXCLUDED.pubkey,
+    amount = EXCLUDED.amount,
+    pool_tx = EXCLUDED.pool_tx,
+    spent_by = EXCLUDED.spent_by,
+    spent = EXCLUDED.spent,
+    redeemed = EXCLUDED.redeemed,
+    swept = EXCLUDED.swept,
+    expire_at = EXCLUDED.expire_at,
+    redeem_tx = EXCLUDED.redeem_tx
 `
 
 type UpsertVtxoParams struct {
@@ -828,6 +933,7 @@ type UpsertVtxoParams struct {
 	Redeemed bool
 	Swept    bool
 	ExpireAt int64
+	RedeemTx sql.NullString
 }
 
 func (q *Queries) UpsertVtxo(ctx context.Context, arg UpsertVtxoParams) error {
@@ -842,6 +948,7 @@ func (q *Queries) UpsertVtxo(ctx context.Context, arg UpsertVtxoParams) error {
 		arg.Redeemed,
 		arg.Swept,
 		arg.ExpireAt,
+		arg.RedeemTx,
 	)
 	return err
 }

server/internal/infrastructure/db/sqlite/sqlc/query.sql

@@ -111,33 +111,61 @@ SELECT id FROM round WHERE starting_timestamp > ? AND starting_timestamp < ?;
 -- name: SelectRoundIds :many
 SELECT id FROM round;
 
+-- name: UpsertUnconditionalForfeitTx :exec
+INSERT INTO uncond_forfeit_tx (tx, vtxo_txid, vtxo_vout, position)
+VALUES (?, ?, ?, ?) ON CONFLICT(id) DO UPDATE SET
+    tx = EXCLUDED.tx,
+    vtxo_txid = EXCLUDED.vtxo_txid,
+    vtxo_vout = EXCLUDED.vtxo_vout,
+    position = EXCLUDED.position;
+
 -- name: UpsertVtxo :exec
-INSERT INTO vtxo (txid, vout, pubkey, amount, pool_tx, spent_by, spent, redeemed, swept, expire_at)
-VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?) ON CONFLICT(txid) DO UPDATE SET
-    vout = excluded.vout,
-    pubkey = excluded.pubkey,
-    amount = excluded.amount,
-    pool_tx = excluded.pool_tx,
-    spent_by = excluded.spent_by,
-    spent = excluded.spent,
-    redeemed = excluded.redeemed,
-    swept = excluded.swept,
-    expire_at = excluded.expire_at;
+INSERT INTO vtxo (txid, vout, pubkey, amount, pool_tx, spent_by, spent, redeemed, swept, expire_at, redeem_tx)
+VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) ON CONFLICT(txid, vout) DO UPDATE SET
+    pubkey = EXCLUDED.pubkey,
+    amount = EXCLUDED.amount,
+    pool_tx = EXCLUDED.pool_tx,
+    spent_by = EXCLUDED.spent_by,
+    spent = EXCLUDED.spent,
+    redeemed = EXCLUDED.redeemed,
+    swept = EXCLUDED.swept,
+    expire_at = EXCLUDED.expire_at,
+    redeem_tx = EXCLUDED.redeem_tx;
 
 -- name: SelectSweepableVtxos :many
-SELECT * FROM vtxo WHERE redeemed = false AND swept = false;
+SELECT  sqlc.embed(vtxo),
+        sqlc.embed(uncond_forfeit_tx_vw)
+FROM vtxo
+        LEFT OUTER JOIN uncond_forfeit_tx_vw ON vtxo.txid=uncond_forfeit_tx_vw.vtxo_txid AND vtxo.vout=uncond_forfeit_tx_vw.vtxo_vout
+WHERE redeemed = false AND swept = false;
 
 -- name: SelectNotRedeemedVtxos :many
-SELECT * FROM vtxo WHERE redeemed = false;
+SELECT  sqlc.embed(vtxo),
+        sqlc.embed(uncond_forfeit_tx_vw)
+FROM vtxo
+        LEFT OUTER JOIN uncond_forfeit_tx_vw ON vtxo.txid=uncond_forfeit_tx_vw.vtxo_txid AND vtxo.vout=uncond_forfeit_tx_vw.vtxo_vout
+WHERE redeemed = false;
 
 -- name: SelectNotRedeemedVtxosWithPubkey :many
-SELECT * FROM vtxo WHERE redeemed = false AND pubkey = ?;
+SELECT  sqlc.embed(vtxo),
+        sqlc.embed(uncond_forfeit_tx_vw)
+FROM vtxo
+        LEFT OUTER JOIN uncond_forfeit_tx_vw ON vtxo.txid=uncond_forfeit_tx_vw.vtxo_txid AND vtxo.vout=uncond_forfeit_tx_vw.vtxo_vout
+WHERE redeemed = false AND pubkey = ?;
 
 -- name: SelectVtxoByOutpoint :one
-SELECT * FROM vtxo WHERE txid = ? AND vout = ?;
+SELECT  sqlc.embed(vtxo),
+        sqlc.embed(uncond_forfeit_tx_vw)
+FROM vtxo
+        LEFT OUTER JOIN uncond_forfeit_tx_vw ON vtxo.txid=uncond_forfeit_tx_vw.vtxo_txid AND vtxo.vout=uncond_forfeit_tx_vw.vtxo_vout
+WHERE txid = ? AND vout = ?;
 
 -- name: SelectVtxosByPoolTxid :many
-SELECT * FROM vtxo WHERE pool_tx = ?;
+SELECT  sqlc.embed(vtxo),
+        sqlc.embed(uncond_forfeit_tx_vw)
+FROM vtxo
+        LEFT OUTER JOIN uncond_forfeit_tx_vw ON vtxo.txid=uncond_forfeit_tx_vw.vtxo_txid AND vtxo.vout=uncond_forfeit_tx_vw.vtxo_vout
+WHERE pool_tx = ?;
 
 -- name: MarkVtxoAsRedeemed :exec
 UPDATE vtxo SET redeemed = true WHERE txid = ? AND vout = ?;

server/internal/infrastructure/db/sqlite/vtxo_repo.go

@@ -35,10 +35,14 @@ func (v *vxtoRepository) Close() {
 
 func (v *vxtoRepository) AddVtxos(ctx context.Context, vtxos []domain.Vtxo) error {
 	txBody := func(querierWithTx *queries.Queries) error {
-		for _, vtxo := range vtxos {
+		for i := range vtxos {
+			vtxo := vtxos[i]
+			var redeemTx string
+			if vtxo.AsyncPayment != nil {
+				redeemTx = vtxo.AsyncPayment.RedeemTx
+			}
 			if err := querierWithTx.UpsertVtxo(
-				ctx,
-				queries.UpsertVtxoParams{
+				ctx, queries.UpsertVtxoParams{
 					Txid:     vtxo.Txid,
 					Vout:     int64(vtxo.VOut),
 					Pubkey:   vtxo.Pubkey,
@@ -49,10 +53,24 @@ func (v *vxtoRepository) AddVtxos(ctx context.Context, vtxos []domain.Vtxo) erro
 					Redeemed: vtxo.Redeemed,
 					Swept:    vtxo.Swept,
 					ExpireAt: vtxo.ExpireAt,
+					RedeemTx: sql.NullString{String: redeemTx, Valid: true},
 				},
 			); err != nil {
 				return err
 			}
+
+			if vtxo.AsyncPayment != nil {
+				for i, tx := range vtxo.AsyncPayment.UnconditionalForfeitTxs {
+					if err := querierWithTx.UpsertUnconditionalForfeitTx(ctx, queries.UpsertUnconditionalForfeitTxParams{
+						Tx:       tx,
+						VtxoTxid: vtxo.Txid,
+						VtxoVout: int64(vtxo.VOut),
+						Position: int64(i),
+					}); err != nil {
+						return err
+					}
+				}
+			}
 		}
 
 		return nil
@@ -62,27 +80,49 @@ func (v *vxtoRepository) AddVtxos(ctx context.Context, vtxos []domain.Vtxo) erro
 }
 
 func (v *vxtoRepository) GetAllSweepableVtxos(ctx context.Context) ([]domain.Vtxo, error) {
-	rows, err := v.querier.SelectSweepableVtxos(ctx)
+	res, err := v.querier.SelectSweepableVtxos(ctx)
 	if err != nil {
 		return nil, err
 	}
 
+	rows := make([]vtxoWithUnconditionalForfeitTxs, 0, len(res))
+	for _, row := range res {
+		rows = append(rows, vtxoWithUnconditionalForfeitTxs{
+			vtxo: row.Vtxo,
+			tx:   row.UncondForfeitTxVw,
+		})
+	}
 	return readRows(rows)
 }
 
 func (v *vxtoRepository) GetAllVtxos(ctx context.Context, pubkey string) ([]domain.Vtxo, []domain.Vtxo, error) {
 	withPubkey := len(pubkey) > 0
 
-	var rows []queries.Vtxo
-	var err error
-
+	var rows []vtxoWithUnconditionalForfeitTxs
 	if withPubkey {
-		rows, err = v.querier.SelectNotRedeemedVtxosWithPubkey(ctx, pubkey)
+		res, err := v.querier.SelectNotRedeemedVtxosWithPubkey(ctx, pubkey)
+		if err != nil {
+			return nil, nil, err
+		}
+		rows = make([]vtxoWithUnconditionalForfeitTxs, 0, len(res))
+		for _, row := range res {
+			rows = append(rows, vtxoWithUnconditionalForfeitTxs{
+				vtxo: row.Vtxo,
+				tx:   row.UncondForfeitTxVw,
+			})
+		}
 	} else {
-		rows, err = v.querier.SelectNotRedeemedVtxos(ctx)
-	}
-	if err != nil {
-		return nil, nil, err
+		res, err := v.querier.SelectNotRedeemedVtxos(ctx)
+		if err != nil {
+			return nil, nil, err
+		}
+		rows = make([]vtxoWithUnconditionalForfeitTxs, 0, len(res))
+		for _, row := range res {
+			rows = append(rows, vtxoWithUnconditionalForfeitTxs{
+				vtxo: row.Vtxo,
+				tx:   row.UncondForfeitTxVw,
+			})
+		}
 	}
 
 	vtxos, err := readRows(rows)
@@ -107,7 +147,7 @@ func (v *vxtoRepository) GetAllVtxos(ctx context.Context, pubkey string) ([]doma
 func (v *vxtoRepository) GetVtxos(ctx context.Context, outpoints []domain.VtxoKey) ([]domain.Vtxo, error) {
 	vtxos := make([]domain.Vtxo, 0, len(outpoints))
 	for _, o := range outpoints {
-		vtxo, err := v.querier.SelectVtxoByOutpoint(
+		res, err := v.querier.SelectVtxoByOutpoint(
 			ctx,
 			queries.SelectVtxoByOutpointParams{
 				Txid: o.Txid,
@@ -118,7 +158,12 @@ func (v *vxtoRepository) GetVtxos(ctx context.Context, outpoints []domain.VtxoKe
 			return nil, err
 		}
 
-		result, err := readRows([]queries.Vtxo{vtxo})
+		result, err := readRows([]vtxoWithUnconditionalForfeitTxs{
+			{
+				vtxo: res.Vtxo,
+				tx:   res.UncondForfeitTxVw,
+			},
+		})
 		if err != nil {
 			return nil, err
 		}
@@ -134,10 +179,17 @@ func (v *vxtoRepository) GetVtxos(ctx context.Context, outpoints []domain.VtxoKe
 }
 
 func (v *vxtoRepository) GetVtxosForRound(ctx context.Context, txid string) ([]domain.Vtxo, error) {
-	rows, err := v.querier.SelectVtxosByPoolTxid(ctx, txid)
+	res, err := v.querier.SelectVtxosByPoolTxid(ctx, txid)
 	if err != nil {
 		return nil, err
 	}
+	rows := make([]vtxoWithUnconditionalForfeitTxs, 0, len(res))
+	for _, row := range res {
+		rows = append(rows, vtxoWithUnconditionalForfeitTxs{
+			vtxo: row.Vtxo,
+			tx:   row.UncondForfeitTxVw,
+		})
+	}
 
 	return readRows(rows)
 }
@@ -224,7 +276,18 @@ func (v *vxtoRepository) UpdateExpireAt(ctx context.Context, vtxos []domain.Vtxo
 	return execTx(ctx, v.db, txBody)
 }
 
-func rowToVtxo(row queries.Vtxo) domain.Vtxo {
+func rowToVtxo(row queries.Vtxo, uncondForfeitTxs []queries.UncondForfeitTxVw) domain.Vtxo {
+	var asyncPayment *domain.AsyncPaymentTxs
+	if row.RedeemTx.Valid && len(uncondForfeitTxs) > 0 {
+		txs := make([]string, len(uncondForfeitTxs))
+		for _, tx := range uncondForfeitTxs {
+			txs[tx.Position.Int64] = tx.Tx.String
+		}
+		asyncPayment = &domain.AsyncPaymentTxs{
+			RedeemTx:                row.RedeemTx.String,
+			UnconditionalForfeitTxs: txs,
+		}
+	}
 	return domain.Vtxo{
 		VtxoKey: domain.VtxoKey{
 			Txid: row.Txid,
@@ -234,19 +297,48 @@ func rowToVtxo(row queries.Vtxo) domain.Vtxo {
 			Pubkey: row.Pubkey,
 			Amount: uint64(row.Amount),
 		},
-		PoolTx:   row.PoolTx,
-		SpentBy:  row.SpentBy,
-		Spent:    row.Spent,
-		Redeemed: row.Redeemed,
-		Swept:    row.Swept,
-		ExpireAt: row.ExpireAt,
+		PoolTx:       row.PoolTx,
+		SpentBy:      row.SpentBy,
+		Spent:        row.Spent,
+		Redeemed:     row.Redeemed,
+		Swept:        row.Swept,
+		ExpireAt:     row.ExpireAt,
+		AsyncPayment: asyncPayment,
 	}
 }
 
-func readRows(rows []queries.Vtxo) ([]domain.Vtxo, error) {
+type vtxoWithUnconditionalForfeitTxs struct {
+	vtxo queries.Vtxo
+	tx   queries.UncondForfeitTxVw
+}
+
+func readRows(rows []vtxoWithUnconditionalForfeitTxs) ([]domain.Vtxo, error) {
+	uncondForfeitTxsMap := make(map[domain.VtxoKey][]queries.UncondForfeitTxVw)
+	for _, row := range rows {
+		if !row.vtxo.RedeemTx.Valid {
+			continue
+		}
+		vtxoKey := domain.VtxoKey{
+			Txid: row.vtxo.Txid,
+			VOut: uint32(row.vtxo.Vout),
+		}
+		if _, ok := uncondForfeitTxsMap[vtxoKey]; !ok {
+			uncondForfeitTxsMap[vtxoKey] = make([]queries.UncondForfeitTxVw, 0)
+		}
+		if row.tx.Tx.Valid {
+			uncondForfeitTxsMap[vtxoKey] = append(
+				uncondForfeitTxsMap[vtxoKey], row.tx,
+			)
+		}
+	}
 	vtxos := make([]domain.Vtxo, 0, len(rows))
-	for _, v := range rows {
-		vtxos = append(vtxos, rowToVtxo(v))
+	for _, row := range rows {
+		vtxoKey := domain.VtxoKey{
+			Txid: row.vtxo.Txid,
+			VOut: uint32(row.vtxo.Vout),
+		}
+		uncondForfeitTxs := uncondForfeitTxsMap[vtxoKey]
+		vtxos = append(vtxos, rowToVtxo(row.vtxo, uncondForfeitTxs))
 	}
 
 	return vtxos, nil

server/internal/infrastructure/tx-builder/covenant/builder.go

@@ -316,6 +316,12 @@ func (b *txBuilder) FindLeaves(
 	return foundLeaves, nil
 }
 
+func (b *txBuilder) BuildAsyncPaymentTransactions(
+	_ []domain.Vtxo, _ *secp256k1.PublicKey, _ []domain.Receiver, _ uint64,
+) (*domain.AsyncPaymentTxs, error) {
+	return nil, fmt.Errorf("not implemented")
+}
+
 func (b *txBuilder) getLeafScriptAndTree(
 	userPubkey, aspPubkey *secp256k1.PublicKey,
 ) ([]byte, *taproot.IndexedElementsTapScriptTree, error) {

server/internal/infrastructure/tx-builder/covenantless/builder.go

@@ -303,6 +303,171 @@ func (b *txBuilder) FindLeaves(congestionTree tree.CongestionTree, fromtxid stri
 	return foundLeaves, nil
 }
 
+// TODO add locktimes to txs
+func (b *txBuilder) BuildAsyncPaymentTransactions(
+	vtxos []domain.Vtxo, aspPubKey *secp256k1.PublicKey,
+	receivers []domain.Receiver, minRelayFee uint64,
+) (*domain.AsyncPaymentTxs, error) {
+	if len(vtxos) <= 0 {
+		return nil, fmt.Errorf("missing vtxos")
+	}
+
+	ins := make([]*wire.OutPoint, 0, len(vtxos))
+	outs := make([]*wire.TxOut, 0, len(receivers))
+	unconditionalForfeitTxs := make([]string, 0, len(vtxos))
+	for _, vtxo := range vtxos {
+		if vtxo.Spent {
+			return nil, fmt.Errorf("all vtxos must be unspent")
+		}
+
+		senderBytes, err := hex.DecodeString(vtxo.Pubkey)
+		if err != nil {
+			return nil, err
+		}
+
+		sender, err := secp256k1.ParsePubKey(senderBytes)
+		if err != nil {
+			return nil, err
+		}
+
+		aspScript, err := p2trScript(aspPubKey, b.onchainNetwork())
+		if err != nil {
+			return nil, err
+		}
+
+		vtxoTxID, err := chainhash.NewHashFromStr(vtxo.Txid)
+		if err != nil {
+			return nil, err
+		}
+
+		vtxoOutpoint := &wire.OutPoint{
+			Hash:  *vtxoTxID,
+			Index: vtxo.VOut,
+		}
+
+		vtxoScript, vtxoTree, err := b.getLeafScriptAndTree(sender, aspPubKey)
+		if err != nil {
+			return nil, err
+		}
+
+		output := &wire.TxOut{
+			PkScript: aspScript,
+			Value:    int64(vtxo.Amount - minRelayFee),
+		}
+
+		forfeitClosure := &bitcointree.MultisigClosure{
+			Pubkey:    sender,
+			AspPubkey: aspPubKey,
+		}
+
+		forfeitLeaf, err := forfeitClosure.Leaf()
+		if err != nil {
+			return nil, err
+		}
+
+		leafProof := vtxoTree.LeafMerkleProofs[vtxoTree.LeafProofIndex[forfeitLeaf.TapHash()]]
+		ctrlBlock := leafProof.ToControlBlock(bitcointree.UnspendableKey())
+		ctrlBlockBytes, err := ctrlBlock.ToBytes()
+		if err != nil {
+			return nil, err
+		}
+
+		unconditionnalForfeitPtx, err := psbt.New(
+			[]*wire.OutPoint{vtxoOutpoint},
+			[]*wire.TxOut{output},
+			2,
+			0,
+			[]uint32{wire.MaxTxInSequenceNum},
+		)
+		if err != nil {
+			return nil, err
+		}
+
+		unconditionnalForfeitPtx.Inputs[0].WitnessUtxo = &wire.TxOut{
+			Value:    int64(vtxo.Amount),
+			PkScript: vtxoScript,
+		}
+
+		unconditionnalForfeitPtx.Inputs[0].TaprootInternalKey = schnorr.SerializePubKey(bitcointree.UnspendableKey())
+		unconditionnalForfeitPtx.Inputs[0].TaprootLeafScript = []*psbt.TaprootTapLeafScript{
+			{
+				ControlBlock: ctrlBlockBytes,
+				Script:       forfeitLeaf.Script,
+				LeafVersion:  txscript.BaseLeafVersion,
+			},
+		}
+
+		forfeitTx, err := unconditionnalForfeitPtx.B64Encode()
+		if err != nil {
+			return nil, err
+		}
+
+		unconditionalForfeitTxs = append(unconditionalForfeitTxs, forfeitTx)
+		ins = append(ins, vtxoOutpoint)
+	}
+
+	for i, receiver := range receivers {
+		// TODO (@louisinger): Add revert policy (sender+ASP)
+		buf, err := hex.DecodeString(receiver.Pubkey)
+		if err != nil {
+			return nil, err
+		}
+		receiverPk, err := secp256k1.ParsePubKey(buf)
+		if err != nil {
+			return nil, err
+		}
+		newVtxoScript, _, err := b.getLeafScriptAndTree(receiverPk, aspPubKey)
+		if err != nil {
+			return nil, err
+		}
+
+		// Deduct the min relay fee from the very last receiver which is supposed
+		// to be the change in case it's not a send-all.
+		value := receiver.Amount
+		if i == len(receivers)-1 {
+			value -= minRelayFee
+		}
+		outs = append(outs, &wire.TxOut{
+			Value:    int64(value),
+			PkScript: newVtxoScript,
+		})
+	}
+
+	redeemPtx, err := psbt.New(
+		ins, outs, 2, 0, []uint32{wire.MaxTxInSequenceNum},
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	for i := range redeemPtx.Inputs {
+		unconditionnalForfeitPsbt, _ := psbt.NewFromRawBytes(
+			strings.NewReader(unconditionalForfeitTxs[i]), true,
+		)
+		redeemPtx.Inputs[i].WitnessUtxo = unconditionnalForfeitPsbt.Inputs[0].WitnessUtxo
+		redeemPtx.Inputs[i].TaprootInternalKey = unconditionnalForfeitPsbt.Inputs[0].TaprootInternalKey
+		redeemPtx.Inputs[i].TaprootLeafScript = unconditionnalForfeitPsbt.Inputs[0].TaprootLeafScript
+
+	}
+
+	redeemTx, err := redeemPtx.B64Encode()
+	if err != nil {
+		return nil, err
+	}
+
+	signedRedeemTx, err := b.wallet.SignTransactionTapscript(
+		context.Background(), redeemTx, nil,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	return &domain.AsyncPaymentTxs{
+		RedeemTx:                signedRedeemTx,
+		UnconditionalForfeitTxs: unconditionalForfeitTxs,
+	}, nil
+}
+
 func (b *txBuilder) getLeafScriptAndTree(
 	userPubkey, aspPubkey *secp256k1.PublicKey,
 ) ([]byte, *txscript.IndexedTapScriptTree, error) {
@@ -316,7 +481,7 @@ func (b *txBuilder) getLeafScriptAndTree(
 		return nil, nil, err
 	}
 
-	forfeitClosure := &bitcointree.ForfeitClosure{
+	forfeitClosure := &bitcointree.MultisigClosure{
 		Pubkey:    userPubkey,
 		AspPubkey: aspPubkey,
 	}
@@ -693,7 +858,9 @@ func (b *txBuilder) createConnectors(
 func (b *txBuilder) createForfeitTxs(
 	aspPubkey *secp256k1.PublicKey, payments []domain.Payment, connectors []*psbt.Packet, minRelayFee uint64,
 ) ([]string, error) {
-	aspScript, err := p2wpkhScript(aspPubkey, b.onchainNetwork())
+	// TODO (@louisinger): are we sure about this change?
+	aspScript, err := p2trScript(aspPubkey, b.onchainNetwork())
+	// aspScript, err := p2wpkhScript(aspPubkey, b.onchainNetwork())
 	if err != nil {
 		return nil, err
 	}
@@ -719,7 +886,7 @@ func (b *txBuilder) createForfeitTxs(
 			var forfeitProof *txscript.TapscriptProof
 
 			for _, proof := range vtxoTaprootTree.LeafMerkleProofs {
-				isForfeit, err := (&bitcointree.ForfeitClosure{}).Decode(proof.Script)
+				isForfeit, err := (&bitcointree.MultisigClosure{}).Decode(proof.Script)
 				if !isForfeit || err != nil {
 					continue
 				}

server/internal/infrastructure/tx-builder/covenantless/utils.go

@@ -10,7 +10,7 @@ import (
 	"github.com/decred/dcrd/dcrec/secp256k1/v4"
 )
 
-func p2wpkhScript(publicKey *secp256k1.PublicKey, net *chaincfg.Params) ([]byte, error) {
+func p2trScript(publicKey *secp256k1.PublicKey, net *chaincfg.Params) ([]byte, error) {
 	tapKey := txscript.ComputeTaprootKeyNoScript(publicKey)
 
 	payment, err := btcutil.NewAddressWitnessPubKeyHash(

server/internal/infrastructure/wallet/btc-embedded/psbt.go

@@ -93,7 +93,7 @@ func (s *service) signPsbt(packet *psbt.Packet) ([]uint32, error) {
 		}
 	}
 
-	// TODO: @louisinger shall we delete this code?
+	// TODO (@louisinger): shall we delete this code?
 	// prevOutputFetcher := wallet.PsbtPrevOutputFetcher(packet)
 	// sigHashes := txscript.NewTxSigHashes(tx, prevOutputFetcher)
 

server/internal/infrastructure/wallet/btc-embedded/wallet.go

@@ -177,6 +177,82 @@ func (s *service) Restore(_ context.Context, seed, password string) error {
 }
 
 func (s *service) Unlock(_ context.Context, password string) error {
+	if s.wallet == nil {
+		pwd := []byte(password)
+		opt := btcwallet.LoaderWithLocalWalletDB(s.cfg.Datadir, false, time.Minute)
+		config := btcwallet.Config{
+			LogDir:                s.cfg.Datadir,
+			PrivatePass:           pwd,
+			PublicPass:            pwd,
+			Birthday:              time.Now(),
+			RecoveryWindow:        0,
+			NetParams:             s.cfg.chainParams(),
+			LoaderOptions:         []btcwallet.LoaderOption{opt},
+			CoinSelectionStrategy: wallet.CoinSelectionLargest,
+			ChainSource:           s.chainSource,
+		}
+		blockCache := blockcache.NewBlockCache(20 * 1024 * 1024)
+
+		wallet, err := btcwallet.New(config, blockCache)
+		if err != nil {
+			return fmt.Errorf("failed to setup wallet loader: %s", err)
+		}
+
+		if err := wallet.Start(); err != nil {
+			return fmt.Errorf("failed to start wallet: %s", err)
+		}
+
+		for {
+			if !wallet.InternalWallet().ChainSynced() {
+				log.Debug("waiting sync....")
+				time.Sleep(3 * time.Second)
+				continue
+			}
+			break
+		}
+		log.Debugf("chain synced")
+
+		addrs, err := wallet.ListAddresses(string(aspKeyAccount), false)
+		if err != nil {
+			return err
+		}
+		for info, addrs := range addrs {
+			if info.AccountName != string(aspKeyAccount) {
+				continue
+			}
+
+			for _, addr := range addrs {
+				if addr.Internal {
+					continue
+				}
+
+				splittedPath := strings.Split(addr.DerivationPath, "/")
+				last := splittedPath[len(splittedPath)-1]
+				if last == "0" {
+					decoded, err := btcutil.DecodeAddress(addr.Address, s.cfg.chainParams())
+					if err != nil {
+						return err
+					}
+
+					infos, err := wallet.AddressInfo(decoded)
+					if err != nil {
+						return err
+					}
+
+					managedPubkeyAddr, ok := infos.(waddrmgr.ManagedPubKeyAddress)
+					if !ok {
+						return fmt.Errorf("failed to cast address to managed pubkey address")
+					}
+
+					s.aspTaprootAddr = managedPubkeyAddr
+					break
+				}
+			}
+		}
+
+		s.wallet = wallet
+		return nil
+	}
 	return s.wallet.InternalWallet().Unlock([]byte(password), nil)
 }
 

server/internal/interface/grpc/handlers/arkservice.go

@@ -40,6 +40,48 @@ func NewHandler(service application.Service) arkv1.ArkServiceServer {
 	return h
 }
 
+func (h *handler) CompletePayment(ctx context.Context, req *arkv1.CompletePaymentRequest) (*arkv1.CompletePaymentResponse, error) {
+	if req.GetSignedRedeemTx() == "" {
+		return nil, status.Error(codes.InvalidArgument, "missing signed redeem tx")
+	}
+
+	if len(req.GetSignedUnconditionalForfeitTxs()) <= 0 {
+		return nil, status.Error(codes.InvalidArgument, "missing signed unconditional forfeit txs")
+	}
+
+	if err := h.svc.CompleteAsyncPayment(
+		ctx, req.GetSignedRedeemTx(), req.GetSignedUnconditionalForfeitTxs(),
+	); err != nil {
+		return nil, err
+	}
+
+	return &arkv1.CompletePaymentResponse{}, nil
+}
+
+func (h *handler) CreatePayment(ctx context.Context, req *arkv1.CreatePaymentRequest) (*arkv1.CreatePaymentResponse, error) {
+	vtxosKeys, err := parseInputs(req.GetInputs())
+	if err != nil {
+		return nil, status.Error(codes.InvalidArgument, err.Error())
+	}
+
+	receivers, err := parseReceivers(req.GetOutputs())
+	if err != nil {
+		return nil, status.Error(codes.InvalidArgument, err.Error())
+	}
+
+	redeemTx, unconditionalForfeitTxs, err := h.svc.CreateAsyncPayment(
+		ctx, vtxosKeys, receivers,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	return &arkv1.CreatePaymentResponse{
+		SignedRedeemTx:                 redeemTx,
+		UsignedUnconditionalForfeitTxs: unconditionalForfeitTxs,
+	}, nil
+}
+
 func (h *handler) Onboard(ctx context.Context, req *arkv1.OnboardRequest) (*arkv1.OnboardResponse, error) {
 	if req.GetUserPubkey() == "" {
 		return nil, status.Error(codes.InvalidArgument, "missing user pubkey")
@@ -98,12 +140,9 @@ func (h *handler) Ping(ctx context.Context, req *arkv1.PingRequest) (*arkv1.Ping
 }
 
 func (h *handler) RegisterPayment(ctx context.Context, req *arkv1.RegisterPaymentRequest) (*arkv1.RegisterPaymentResponse, error) {
-	vtxosKeys := make([]domain.VtxoKey, 0, len(req.GetInputs()))
-	for _, input := range req.GetInputs() {
-		vtxosKeys = append(vtxosKeys, domain.VtxoKey{
-			Txid: input.GetTxid(),
-			VOut: input.GetVout(),
-		})
+	vtxosKeys, err := parseInputs(req.GetInputs())
+	if err != nil {
+		return nil, status.Error(codes.InvalidArgument, err.Error())
 	}
 
 	id, err := h.svc.SpendVtxos(ctx, vtxosKeys)
@@ -350,6 +389,13 @@ func (v vtxoList) toProto(hrp string, aspKey *secp256k1.PublicKey) []*arkv1.Vtxo
 			key, _ := secp256k1.ParsePubKey(buf)
 			addr, _ = common.EncodeAddress(hrp, key, aspKey)
 		}
+		var pendingData *arkv1.PendingPayment
+		if vv.AsyncPayment != nil {
+			pendingData = &arkv1.PendingPayment{
+				RedeemTx:                vv.AsyncPayment.RedeemTx,
+				UnconditionalForfeitTxs: vv.AsyncPayment.UnconditionalForfeitTxs,
+			}
+		}
 		list = append(list, &arkv1.Vtxo{
 			Outpoint: &arkv1.Input{
 				Txid: vv.Txid,
@@ -359,13 +405,16 @@ func (v vtxoList) toProto(hrp string, aspKey *secp256k1.PublicKey) []*arkv1.Vtxo
 				Address: addr,
 				Amount:  vv.Amount,
 			},
-			PoolTxid: vv.PoolTx,
-			Spent:    vv.Spent,
-			ExpireAt: vv.ExpireAt,
-			SpentBy:  vv.SpentBy,
-			Swept:    vv.Swept,
+			PoolTxid:    vv.PoolTx,
+			Spent:       vv.Spent,
+			ExpireAt:    vv.ExpireAt,
+			SpentBy:     vv.SpentBy,
+			Swept:       vv.Swept,
+			PendingData: pendingData,
+			Pending:     pendingData != nil,
 		})
 	}
+
 	return list
 }
 

server/internal/interface/grpc/handlers/utils.go

@@ -30,6 +30,21 @@ func parseAddress(addr string) (string, *secp256k1.PublicKey, *secp256k1.PublicK
 	return common.DecodeAddress(addr)
 }
 
+func parseInputs(ins []*arkv1.Input) ([]domain.VtxoKey, error) {
+	if len(ins) <= 0 {
+		return nil, fmt.Errorf("missing inputs")
+	}
+
+	vtxos := make([]domain.VtxoKey, 0, len(ins))
+	for _, input := range ins {
+		vtxos = append(vtxos, domain.VtxoKey{
+			Txid: input.GetTxid(),
+			VOut: input.GetVout(),
+		})
+	}
+	return vtxos, nil
+}
+
 func parseReceivers(outs []*arkv1.Output) ([]domain.Receiver, error) {
 	receivers := make([]domain.Receiver, 0, len(outs))
 	for _, out := range outs {

server/internal/interface/grpc/permissions/permissions.go

@@ -149,6 +149,14 @@ func Whitelist() map[string][]bakery.Op {
 			Entity: EntityArk,
 			Action: "write",
 		}},
+		fmt.Sprintf("/%s/CreatePayment", arkv1.ArkService_ServiceDesc.ServiceName): {{
+			Entity: EntityArk,
+			Action: "write",
+		}},
+		fmt.Sprintf("/%s/CompletePayment", arkv1.ArkService_ServiceDesc.ServiceName): {{
+			Entity: EntityArk,
+			Action: "write",
+		}},
 		fmt.Sprintf("/%s/Check", grpchealth.Health_ServiceDesc.ServiceName): {{
 			Entity: EntityHealth,
 			Action: "read",

server/test/e2e/covenantless/e2e_test.go

@@ -109,6 +109,14 @@ func TestSendOffchain(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, json.Unmarshal([]byte(balanceStr), &balance))
 	require.NotZero(t, balance.Offchain.Total)
+
+	_, err = runClarkCommand("claim", "--password", utils.Password)
+	require.NoError(t, err)
+
+	balanceStr, err = runClarkCommand("balance")
+	require.NoError(t, err)
+	require.NoError(t, json.Unmarshal([]byte(balanceStr), &balance))
+	require.NotZero(t, balance.Offchain.Total)
 }
 
 func TestUnilateralExit(t *testing.T) {