Fix fetching symbols from bitmex and bit.com

AUTHORS.md

@@ -16,4 +16,5 @@ Cryptofeed was originally created by Bryant Moscon, but many others have contrib
 * [Jonggyun Kim](https://github.com/gyunt) - <[email protected]>
 * [QuasarDB](https://quasar.ai/)
 * [Thomas Bouamoud](https://github.com/thomasbs17) - <[email protected]>
-* [Carlo Eugster](https://github.com/carloe) - <[email protected]>
+* [Carlo Eugster](https://github.com/carloe) - <[email protected]>
+* [Marten Schlüter](https://github.com/maschlr)

CHANGES.md

@@ -8,6 +8,8 @@
  * Update: Bybit migrate to API V5 for public streams
  * Bugfix: Handle None ids for Kraken trades in QuestDB
  * Bugfix: Handle OrderChanged event in IndependentReserve
+ * Bugfix: Remove deprecated `USD` currency from bit.com
+ * Bugfix: Make `entry` key optional when retrieving symbols for BitMex  
 
 ### 2.4.0 (2024-01-07)
  * Update: Fix tests

cryptofeed/exchanges/bitdotcom.py

@@ -5,7 +5,7 @@
 import logging
 from decimal import Decimal
 import time
-from typing import Dict, List, Tuple, Union
+from typing import Dict, Tuple
 from collections import defaultdict
 import hashlib
 import hmac
@@ -51,9 +51,9 @@ def __init__(self, *args, **kwargs):
         self._sequence_no = defaultdict(int)
 
     @classmethod
-    def _symbol_endpoint_prepare(cls, ep: RestEndpoint) -> Union[List[str], str]:
+    def _symbol_endpoint_prepare(cls, ep: RestEndpoint) -> str:
         if ep.routes.currencies:
-            return [ep.route('instruments').format(currency) for currency in ('USD', 'USDT')]
+            return ep.route('instruments').format('USDT')
         return ep.route('instruments')
 
     @classmethod

cryptofeed/exchanges/bitmex.py

@@ -58,7 +58,7 @@ def _parse_symbol_data(cls, data: dict) -> Tuple[Dict, Dict]:
             else:
                 LOG.info('Unsupported type %s for instrument %s', entry['typ'], entry['symbol'])
 
-            s = Symbol(base, quote, type=stype, expiry_date=entry['expiry'])
+            s = Symbol(base, quote, type=stype, expiry_date=entry.get('expiry'))
             if s.normalized not in ret:
                 ret[s.normalized] = entry['symbol']
                 info['tick_size'][s.normalized] = entry['tickSize']