Merge pull request #2655 from freqtrade/avoid_keyerror_backtest

Use first pair of pairlist to get fee

freqtrade/edge/__init__.py

@@ -80,7 +80,7 @@ class Edge:
         if config.get('fee'):
             self.fee = config['fee']
         else:
-            self.fee = self.exchange.get_fee()
+            self.fee = self.exchange.get_fee(symbol=self.config['exchange']['pair_whitelist'][0])
 
     def calculate(self) -> bool:
         pairs = self.config['exchange']['pair_whitelist']

freqtrade/exchange/exchange.py

@@ -921,7 +921,7 @@ class Exchange:
             raise OperationalException(e) from e
 
     @retrier
-    def get_fee(self, symbol='ETH/BTC', type='', side='', amount=1,
+    def get_fee(self, symbol, type='', side='', amount=1,
                 price=1, taker_or_maker='maker') -> float:
         try:
             # validate that markets are loaded before trying to get fee

freqtrade/optimize/backtesting.py

@@ -65,7 +65,7 @@ class Backtesting:
         if config.get('fee'):
             self.fee = config['fee']
         else:
-            self.fee = self.exchange.get_fee()
+            self.fee = self.exchange.get_fee(symbol=self.config['exchange']['pair_whitelist'][0])
 
         if self.config.get('runmode') != RunMode.HYPEROPT:
             self.dataprovider = DataProvider(self.config, self.exchange)