diff --git a/lib/core/src/sdk.rs b/lib/core/src/sdk.rs
index 900c756..ef814ac 100644
--- a/lib/core/src/sdk.rs
+++ b/lib/core/src/sdk.rs
@@ -896,18 +896,12 @@ impl LiquidSdk {
             });
         }
 
-        // Ensure we use the same fee-rate from the `PrepareSendResponse`
-        let fee_rate_msat_per_vb = utils::derive_fee_rate_msat_per_vb(
-            self.onchain_wallet.clone(),
-            receiver_amount_sat,
-            &address_data.address,
-            fees_sat,
-        )
-        .await?;
         let tx = self
             .onchain_wallet
             .build_tx(
-                Some(fee_rate_msat_per_vb),
+                self.config
+                    .lowball_fee_rate_msat_per_vbyte()
+                    .map(|v| v as f32),
                 &address_data.address,
                 receiver_amount_sat,
             )
diff --git a/lib/core/src/utils.rs b/lib/core/src/utils.rs
index 191e018..14e8e12 100644
--- a/lib/core/src/utils.rs
+++ b/lib/core/src/utils.rs
@@ -1,12 +1,8 @@
 use std::str::FromStr;
-use std::sync::Arc;
 use std::time::{SystemTime, UNIX_EPOCH};
 
 use crate::error::{PaymentError, SdkResult};
-use crate::prelude::STANDARD_FEE_RATE_SAT_PER_VBYTE;
-use crate::wallet::OnchainWallet;
 use anyhow::{anyhow, Result};
-use log::debug;
 use lwk_wollet::elements::encode::deserialize;
 use lwk_wollet::elements::hex::FromHex;
 use lwk_wollet::elements::{
@@ -53,27 +49,3 @@ pub(crate) fn deserialize_tx_hex(tx_hex: &str) -> Result<Transaction> {
         |err| anyhow!("Could not deserialize transaction: {err:?}"),
     )?)?)
 }
-
-pub(crate) async fn derive_fee_rate_msat_per_vb(
-    wallet: Arc<dyn OnchainWallet>,
-    amount_sat: u64,
-    recipient_address: &str,
-    absolute_fees_sat: u64,
-) -> Result<f32> {
-    let standard_fees_sat = wallet
-        .build_tx(None, recipient_address, amount_sat)
-        .await?
-        .all_fees()
-        .values()
-        .sum::<u64>() as f64;
-
-    // Multiply sats/vb value by 1000 i.e. 1.0 sat/byte = 1000.0 sat/kvb = 1000.0 millisat/vb
-    // We calculate using f64 and convert to f32 in the last step, so we keep the maximum precision possible
-    let result_sat_per_vb =
-        STANDARD_FEE_RATE_SAT_PER_VBYTE * absolute_fees_sat as f64 / standard_fees_sat;
-    let result_msat_per_vb = result_sat_per_vb * 1000.0;
-    let result_msat_per_vb_f32 = result_msat_per_vb as f32;
-    debug!("derive_fee_rate_msat_per_vb: result_msat_per_vb_f32 {} from inputs: absolute_fees_sat {}, result_msat_per_vb: {}",
-        result_msat_per_vb_f32, absolute_fees_sat, result_msat_per_vb);
-    Ok(result_msat_per_vb_f32)
-}