diff --git a/cashu/wallet/wallet.py b/cashu/wallet/wallet.py
index 719ffee..b32421a 100644
--- a/cashu/wallet/wallet.py
+++ b/cashu/wallet/wallet.py
@@ -45,10 +45,12 @@ class LedgerAPI:
 
     @staticmethod
     def _get_keys(url):
-        resp = requests.get(url + "/keys").json()
+        resp = requests.get(url + "/keys")
+        resp.raise_for_status()
+        data = resp.json()
         return {
             int(amt): PublicKey(bytes.fromhex(val), raw=True)
-            for amt, val in resp.items()
+            for amt, val in data.items()
         }
 
     @staticmethod
@@ -88,6 +90,7 @@ class LedgerAPI:
     def request_mint(self, amount):
         """Requests a mint from the server and returns Lightning invoice."""
         r = requests.get(self.url + "/mint", params={"amount": amount})
+        r.raise_for_status()
         return r.json()
 
     @staticmethod
@@ -130,13 +133,11 @@ class LedgerAPI:
             json=payloads.dict(),
             params={"payment_hash": payment_hash},
         )
+        resp.raise_for_status()
         try:
             promises_list = resp.json()
         except:
-            if resp.status_code >= 300:
-                raise Exception(f"Error: {f'mint returned {resp.status_code}'}")
-            else:
-                raise Exception("Unkown mint error.")
+            raise Exception("Unkown mint error.")
         if "error" in promises_list:
             raise Exception("Error: {}".format(promises_list["error"]))
 
@@ -180,14 +181,11 @@ class LedgerAPI:
             self.url + "/split",
             json=split_payload.dict(),
         )
-
+        resp.raise_for_status()
         try:
             promises_dict = resp.json()
         except:
-            if resp.status_code >= 300:
-                raise Exception(f"Error: {f'mint returned {resp.status_code}'}")
-            else:
-                raise Exception("Unkown mint error.")
+            raise Exception("Unkown mint error.")
         if "error" in promises_dict:
             raise Exception("Mint Error: {}".format(promises_dict["error"]))
         promises_fst = [BlindedSignature.from_dict(p) for p in promises_dict["fst"]]
@@ -204,28 +202,36 @@ class LedgerAPI:
 
     async def check_spendable(self, proofs: List[Proof]):
         payload = CheckRequest(proofs=proofs)
-        return_dict = requests.post(
+        resp = requests.post(
             self.url + "/check",
             json=payload.dict(),
-        ).json()
-
+        )
+        resp.raise_for_status()
+        return_dict = resp.json()
+        
         return return_dict
 
     async def check_fees(self, payment_request: str):
         """Checks whether the Lightning payment is internal."""
         payload = CheckFeesRequest(pr=payment_request)
-        return_dict = requests.post(
+        resp = requests.post(
             self.url + "/checkfees",
             json=payload.dict(),
-        ).json()
+        )
+        resp.raise_for_status()
+
+        return_dict = resp.json()
         return return_dict
 
     async def pay_lightning(self, proofs: List[Proof], invoice: str):
         payload = MeltRequest(proofs=proofs, invoice=invoice)
-        return_dict = requests.post(
+        resp = requests.post(
             self.url + "/melt",
             json=payload.dict(),
-        ).json()
+        )
+        resp.raise_for_status()
+        
+        return_dict = resp.json()
         return return_dict