diff --git a/backend/routes/exchange.py b/backend/routes/exchange.py
index e96f352..ff58619 100644
--- a/backend/routes/exchange.py
+++ b/backend/routes/exchange.py
@@ -170,6 +170,7 @@ def _to_exchange_response(
         slot_start=exchange.slot_start,
         slot_end=exchange.slot_end,
         direction=exchange.direction.value,
+        bitcoin_transfer_method=exchange.bitcoin_transfer_method.value,
         eur_amount=exchange.eur_amount,
         sats_amount=exchange.sats_amount,
         market_price_eur=exchange.market_price_eur,
@@ -588,6 +589,7 @@ def _to_admin_exchange_response(exchange: Exchange) -> AdminExchangeResponse:
         slot_start=exchange.slot_start,
         slot_end=exchange.slot_end,
         direction=exchange.direction.value,
+        bitcoin_transfer_method=exchange.bitcoin_transfer_method.value,
         eur_amount=exchange.eur_amount,
         sats_amount=exchange.sats_amount,
         market_price_eur=exchange.market_price_eur,
diff --git a/backend/schemas.py b/backend/schemas.py
index c7688b4..259c07e 100644
--- a/backend/schemas.py
+++ b/backend/schemas.py
@@ -198,6 +198,7 @@ class ExchangeRequest(BaseModel):
 
     slot_start: datetime
     direction: str  # "buy" or "sell"
+    bitcoin_transfer_method: str  # "onchain" or "lightning"
     eur_amount: int  # EUR cents (e.g., 10000 = €100)
 
 
@@ -210,6 +211,7 @@ class ExchangeResponse(BaseModel):
     slot_start: datetime
     slot_end: datetime
     direction: str
+    bitcoin_transfer_method: str
     eur_amount: int  # EUR cents
     sats_amount: int  # Satoshis
     market_price_eur: float
@@ -241,6 +243,7 @@ class AdminExchangeResponse(BaseModel):
     slot_start: datetime
     slot_end: datetime
     direction: str
+    bitcoin_transfer_method: str
     eur_amount: int
     sats_amount: int
     market_price_eur: float