diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index 08cd1256e..aa3ba4829 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -568,7 +568,7 @@ class Exchange:
 
     def apply_leverage_to_stake_amount(self, stake_amount: float, leverage: float):
         """
-        #* Should be implemented by child classes if leverage affects the stake_amount
+        # * Should be implemented by child classes if leverage affects the stake_amount
         Takes the minimum stake amount for a pair with no leverage and returns the minimum
         stake amount when leverage is considered
         :param stake_amount: The stake amount for a pair before leverage is considered
@@ -1531,7 +1531,7 @@ class Exchange:
         :returns List of trade data
         """
         if not self.exchange_has("fetchTrades"):
-            raise OperationalException("This exchange does not suport downloading Trades.")
+            raise OperationalException("This exchange does not support downloading Trades.")
 
         return asyncio.get_event_loop().run_until_complete(
             self._async_get_trade_history(pair=pair, since=since,
@@ -1540,6 +1540,16 @@ class Exchange:
     def transfer(self, asset: str, amount: float, frm: str, to: str, pair: Optional[str]):
         self._api.transfer(asset, amount, frm, to)
 
+    def get_isolated_liq(self, pair: str, open_rate: float,
+                         amount: float, leverage: float, is_short: bool) -> float:
+        raise OperationalException(
+            f"Isolated margin is not available on {self.name} using freqtrade"
+        )
+
+    def get_interest_rate(self, pair: str, open_rate: float, is_short: bool) -> float:
+        # TODO-mg: implement
+        return 0.0005
+
 
 def is_exchange_known_ccxt(exchange_name: str, ccxt_module: CcxtModuleType = None) -> bool:
     return exchange_name in ccxt_exchanges(ccxt_module)
diff --git a/tests/exchange/test_exchange.py b/tests/exchange/test_exchange.py
index a3ebbe8bd..935775477 100644
--- a/tests/exchange/test_exchange.py
+++ b/tests/exchange/test_exchange.py
@@ -2177,7 +2177,7 @@ def test_get_historic_trades_notsupported(default_conf, mocker, caplog, exchange
     pair = 'ETH/BTC'
 
     with pytest.raises(OperationalException,
-                       match="This exchange does not suport downloading Trades."):
+                       match="This exchange does not support downloading Trades."):
         exchange.get_historic_trades(pair, since=trades_history[0][0],
                                      until=trades_history[-1][0])