Add /exchanges endpoint to list available exchanges

freqtrade/rpc/api_server/api_schemas.py

@@ -5,6 +5,7 @@ from pydantic import BaseModel
 
 from freqtrade.constants import DATETIME_PRINT_FORMAT, IntOrInf
 from freqtrade.enums import OrderTypeValues, SignalDirection, TradingMode
+from freqtrade.types import ValidExchangesType
 
 
 class Ping(BaseModel):
@@ -396,6 +397,10 @@ class StrategyListResponse(BaseModel):
     strategies: List[str]
 
 
+class ExchangeListResponse(BaseModel):
+    exchanges: List[ValidExchangesType]
+
+
 class FreqAIModelListResponse(BaseModel):
     freqaimodels: List[str]