From c112b84d0f838d10b2f38e143bc124544908eaae Mon Sep 17 00:00:00 2001
From: Matthias <xmatthias@outlook.com>
Date: Mon, 16 Dec 2024 21:32:39 +0100
Subject: [PATCH] feat: support dynamic proxy coin conversion

---
 freqtrade/exchange/binance.py        | 4 ++++
 freqtrade/exchange/exchange.py       | 4 ++++
 freqtrade/exchange/exchange_types.py | 2 ++
 3 files changed, 10 insertions(+)

diff --git a/freqtrade/exchange/binance.py b/freqtrade/exchange/binance.py
index 74a37b4f6..9ac1b0d97 100644
--- a/freqtrade/exchange/binance.py
+++ b/freqtrade/exchange/binance.py
@@ -48,6 +48,10 @@ class Binance(Exchange):
             PriceType.MARK: "MARK_PRICE",
         },
         "ws_enabled": False,
+        "proxy_coin_mapping": {
+            "BNFCR": "USDC",
+            "BFUSD": "USDT",
+        },
     }
 
     _supported_trading_mode_margin_pairs: list[tuple[TradingMode, MarginMode]] = [
diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index bba6c5aaf..932d74922 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -156,6 +156,7 @@ class Exchange:
         # Override createMarketBuyOrderRequiresPrice where ccxt has it wrong
         "marketOrderRequiresPrice": False,
         "exchange_has_overrides": {},  # Dictionary overriding ccxt's "has".
+        "proxy_coin_mapping": {},  # Mapping for proxy coins
         # Expected to be in the format {"fetchOHLCV": True} or {"fetchOHLCV": False}
         "ws_enabled": False,  # Set to true for exchanges with tested websocket support
     }
@@ -1872,6 +1873,9 @@ class Exchange:
         :returns: Conversion rate from coin to currency
         :raises: ExchangeErrors
         """
+
+        if (proxy_coin := self._ft_has["proxy_coin_mapping"].get(coin, None)) is not None:
+            coin = proxy_coin
         if coin == currency:
             return 1.0
         tickers = self.get_tickers(cached=True)
diff --git a/freqtrade/exchange/exchange_types.py b/freqtrade/exchange/exchange_types.py
index 69741dc65..9687057bd 100644
--- a/freqtrade/exchange/exchange_types.py
+++ b/freqtrade/exchange/exchange_types.py
@@ -47,6 +47,8 @@ class FtHas(TypedDict, total=False):
     needs_trading_fees: bool
     order_props_in_contracts: list[Literal["amount", "cost", "filled", "remaining"]]
 
+    proxy_coin_mapping: dict[str, str]
+
     # Websocket control
     ws_enabled: bool