chore: don't suggest binance.us supports futures

it doesn't.

freqtrade/exchange/__init__.py

@@ -4,7 +4,7 @@ from freqtrade.exchange.common import MAP_EXCHANGE_CHILDCLASS
 from freqtrade.exchange.exchange import Exchange
 
 # isort: on
-from freqtrade.exchange.binance import Binance
+from freqtrade.exchange.binance import Binance, Binanceus, Binanceusdm
 from freqtrade.exchange.bingx import Bingx
 from freqtrade.exchange.bitget import Bitget
 from freqtrade.exchange.bitmart import Bitmart

freqtrade/exchange/binance.py

@@ -544,3 +544,26 @@ class Binance(Exchange):
                 cache[ft_symbol] = delist_dt
 
         return cache.get(pair, None)
+
+
+class Binanceusdm(Binance):
+    """Binacne USDM Exchange
+    Same as Binance - only futures trading is supported (via ccxt).
+
+    Not actually necessary, binance should be preferred.
+    """
+
+    _supported_trading_mode_margin_pairs: list[tuple[TradingMode, MarginMode]] = [
+        (TradingMode.FUTURES, MarginMode.CROSS),
+        (TradingMode.FUTURES, MarginMode.ISOLATED),
+    ]
+
+
+class Binanceus(Binance):
+    """Binance US exchange class.
+    Minimal adjustment to disable futures trading for the US subsidiary of Binance
+    """
+
+    _supported_trading_mode_margin_pairs: list[tuple[TradingMode, MarginMode]] = [
+        (TradingMode.SPOT, MarginMode.NONE),
+    ]

freqtrade/exchange/common.py

@@ -45,8 +45,6 @@ BAD_EXCHANGES = {
 }
 
 MAP_EXCHANGE_CHILDCLASS = {
-    "binanceus": "binance",
-    "binanceusdm": "binance",
     "okex": "okx",
     "gateio": "gate",
     "huboi": "htx",
@@ -54,6 +52,8 @@ MAP_EXCHANGE_CHILDCLASS = {
 
 SUPPORTED_EXCHANGES = [
     "binance",
+    "binanceus",
+    "binanceusdm",
     "bingx",
     "bitmart",
     "bitget",