Necessary imports

piker/brokers/deribit/api.py

@@ -19,10 +19,14 @@ Deribit backend.
 
 '''
 import asyncio
+from collections import ChainMap
 from contextlib import (
     asynccontextmanager as acm,
 )
 from datetime import datetime
+from decimal import (
+    Decimal,
+)
 from functools import partial
 import time
 from typing import (
@@ -53,7 +57,16 @@ from cryptofeed.defines import (
 from cryptofeed.symbols import Symbol
 # types for managing the cb callbacks.
 # from cryptofeed.types import L1Book
-from piker.accounting import MktPair
+from .venues import (
+    MarketType,
+    PAIRTYPES,
+    Pair,
+    OptionPair,
+)
+from piker.accounting import (
+    Asset,
+    MktPair,
+)
 from piker.data import (
     def_iohlcv_fields,
     match_from_pairs,