diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index b2869df11..a3102856a 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -1521,10 +1521,23 @@ class Exchange:
             self._async_get_trade_history(pair=pair, since=since,
                                           until=until, from_id=from_id))
 
-    def get_interest_rate(self, pair: str, maker_or_taker: str, is_short: bool) -> float:
+    @retrier
+    def get_interest_rate(
+        self,
+        pair: str,
+        maker_or_taker: str,
+        is_short: bool
+    ) -> Tuple[float, float]:
+        """
+            :param pair: base/quote currency pair
+            :param maker_or_taker: "maker" if limit order, "taker" if market order
+            :param is_short: True if requesting base interest, False if requesting quote interest
+            :return: (open_interest, rollover_interest)
+        """
         # TODO-lev: implement
         return (0.0005, 0.0005)
 
+    @retrier
     def fill_leverage_brackets(self):
         """
             #TODO-lev: Should maybe be renamed, leverage_brackets might not be accurate for kraken
@@ -1543,6 +1556,7 @@ class Exchange:
         raise OperationalException(
             f"{self.name.capitalize()}.get_max_leverage has not been implemented.")
 
+    @retrier
     def set_leverage(self, leverage: float, pair: Optional[str]):
         """
             Set's the leverage before making a trade, in order to not
@@ -1558,7 +1572,8 @@ class Exchange:
         except ccxt.BaseError as e:
             raise OperationalException(e) from e
 
-    def set_margin_mode(self, symbol: str, collateral: Collateral, params: dict = {}):
+    @retrier
+    def set_margin_mode(self, pair: str, collateral: Collateral, params: dict = {}):
         '''
             Set's the margin mode on the exchange to cross or isolated for a specific pair
             :param symbol: base/quote currency pair (e.g. "ADA/USDT")
@@ -1568,7 +1583,7 @@ class Exchange:
             return
 
         try:
-            self._api.set_margin_mode(symbol, collateral.value, params)
+            self._api.set_margin_mode(pair, collateral.value, params)
         except ccxt.DDoSProtection as e:
             raise DDosProtection(e) from e
         except (ccxt.NetworkError, ccxt.ExchangeError) as e:
diff --git a/tests/exchange/test_binance.py b/tests/exchange/test_binance.py
index bc4cfaa36..aa4c4c62e 100644
--- a/tests/exchange/test_binance.py
+++ b/tests/exchange/test_binance.py
@@ -149,7 +149,7 @@ def test_get_max_leverage_binance(default_conf, mocker, pair, nominal_value, max
 
 def test_fill_leverage_brackets_binance(default_conf, mocker):
     api_mock = MagicMock()
-    api_mock.load_leverage_brackets = MagicMock(return_value={{
+    api_mock.load_leverage_brackets = MagicMock(return_value={
         'ADA/BUSD': [[0.0, '0.025'],
                      [100000.0, '0.05'],
                      [500000.0, '0.1'],
@@ -173,7 +173,7 @@ def test_fill_leverage_brackets_binance(default_conf, mocker):
                      [250000.0, '0.125'],
                      [1000000.0, '0.5']],
 
-    }})
+    })
     exchange = get_patched_exchange(mocker, default_conf, api_mock, id="binance")
 
     assert exchange._leverage_brackets == {
diff --git a/tests/exchange/test_exchange.py b/tests/exchange/test_exchange.py
index 710b70afe..a5e9f6d4c 100644
--- a/tests/exchange/test_exchange.py
+++ b/tests/exchange/test_exchange.py
@@ -2998,8 +2998,8 @@ def test_set_leverage(mocker, default_conf, exchange_name, collateral):
         exchange_name,
         "set_leverage",
         "set_leverage",
-        symbol="XRP/USDT",
-        collateral=collateral
+        pair="XRP/USDT",
+        leverage=5.0
     )
 
 
@@ -3021,6 +3021,6 @@ def test_set_margin_mode(mocker, default_conf, exchange_name, collateral):
         exchange_name,
         "set_margin_mode",
         "set_margin_mode",
-        symbol="XRP/USDT",
+        pair="XRP/USDT",
         collateral=collateral
     )
diff --git a/tests/exchange/test_kraken.py b/tests/exchange/test_kraken.py
index eddef08b8..90c032679 100644
--- a/tests/exchange/test_kraken.py
+++ b/tests/exchange/test_kraken.py
@@ -274,7 +274,7 @@ def test_get_max_leverage_kraken(default_conf, mocker, pair, nominal_value, max_
 
 def test_fill_leverage_brackets_kraken(default_conf, mocker):
     api_mock = MagicMock()
-    api_mock.load_markets = MagicMock(return_value={{
+    api_mock.load_markets = MagicMock(return_value={
         "ADA/BTC": {'active': True,
                     'altname': 'ADAXBT',
                     'base': 'ADA',
@@ -483,7 +483,7 @@ def test_fill_leverage_brackets_kraken(default_conf, mocker):
                                         [5000000, 0.0012],
                                         [10000000, 0.0001]]}}
 
-    }})
+    })
     exchange = get_patched_exchange(mocker, default_conf, api_mock, id="kraken")
 
     assert exchange._leverage_brackets == {