Remove unused USDC var and lint

Author: kylexqian

tee_gateway/__main__.py

@@ -27,8 +27,12 @@
 from x402.http.types import RouteConfig
 from x402.mechanisms.evm.exact import ExactEvmServerScheme
 from x402.mechanisms.evm.upto import UptoEvmServerScheme
-from x402.extensions.eip2612_gas_sponsoring import declare_eip2612_gas_sponsoring_extension
-from x402.extensions.erc20_approval_gas_sponsoring import declare_erc20_approval_gas_sponsoring_extension
+from x402.extensions.eip2612_gas_sponsoring import (
+    declare_eip2612_gas_sponsoring_extension,
+)
+from x402.extensions.erc20_approval_gas_sponsoring import (
+    declare_erc20_approval_gas_sponsoring_extension,
+)
 from x402.schemas import AssetAmount
 from x402.server import x402ResourceServerSync
 from x402.session import SessionStore
@@ -186,7 +190,7 @@ def _shutdown_heartbeat():
                     },
                 ),
                 network=BASE_MAINNET_NETWORK,
-           ),
+            ),
         ],
         extensions={
             **declare_eip2612_gas_sponsoring_extension(),

tee_gateway/definitions.py

@@ -53,7 +53,6 @@
 
 # Maps lowercase contract address → number of decimals for unit conversion.
 ASSET_DECIMALS_BY_ADDRESS: dict[str, int] = {
-    USDC_ADDRESS.lower(): 6,  # USDC / OUSDC standard: 6 decimals
     BASE_TESTNET_OPG_ADDRESS.lower(): 18,  # OPG: 18 decimals (ERC-20 standard)
     BASE_MAINNET_OPG_ADDRESS.lower(): 18,  # OPG: 18 decimals (ERC-20 standard)
 }

tests/test_pricing.py

@@ -11,7 +11,7 @@
 import unittest
 from decimal import Decimal
 
-from tee_gateway.definitions import BASE_TESTNET_OPG_ADDRESS, USDC_ADDRESS
+from tee_gateway.definitions import BASE_TESTNET_OPG_ADDRESS
 from tee_gateway.model_registry import (
     _MODEL_LOOKUP,
     get_model_config,