Add Bittrex subclass to correctly handle L2 orderbook

freqtrade/exchange/__init__.py

@@ -5,6 +5,7 @@ from freqtrade.exchange.exchange import Exchange
 # isort: on
 from freqtrade.exchange.bibox import Bibox
 from freqtrade.exchange.binance import Binance
+from freqtrade.exchange.bittrex import Bittrex
 from freqtrade.exchange.exchange import (available_exchanges, ccxt_exchanges,
                                          get_exchange_bad_reason, is_exchange_bad,
                                          is_exchange_known_ccxt, is_exchange_officially_supported,

freqtrade/exchange/bittrex.py

@@ -0,0 +1,23 @@
+""" Bittrex exchange subclass """
+import logging
+from typing import Dict
+
+from freqtrade.exchange import Exchange
+
+
+logger = logging.getLogger(__name__)
+
+
+class Bittrex(Exchange):
+    """
+    Bittrex exchange class. Contains adjustments needed for Freqtrade to work
+    with this exchange.
+
+    Please note that this exchange is not included in the list of exchanges
+    officially supported by the Freqtrade development team. So some features
+    may still not work as expected.
+    """
+
+    _ft_has: Dict = {
+        "l2_limit_range": [1, 25, 500],
+    }