add etherscan api key as optional parameter

main.py

@@ -21,7 +21,8 @@ async def main():
     monitor = EventMonitor(
         config={
             "infura_url": config['infura_url'],
-            "pool_address": config['pool_address']
+            "pool_address": config['pool_address'],
+            "etherscan_key": config['etherscan_key']
         },
         queue=queue
     )

monitor.py

@@ -15,7 +15,7 @@ class EventMonitor:
         self.web3 = Web3(Web3.HTTPProvider(self.config['infura_url']))
 
         pool_address = self.config['pool_address']
-        pool_abi = fetch_abi(pool_address)
+        pool_abi = fetch_abi(pool_address, key=self.config['etherscan_key'])
         self.contract = self.web3.eth.contract(
             address=pool_address,
             abi=pool_abi
@@ -37,7 +37,7 @@ class EventMonitor:
 
     def fetch_token_info(self, token_address):
         try:
-            token_abi = fetch_abi(token_address)
+            token_abi = fetch_abi(token_address, key=self.config['etherscan_key'])
         except Exception as err:
             logger.warning(f"Failed to fetch info for {token_address}: {err}")
             return {

util.py

@@ -6,8 +6,8 @@ from web3.types import ChecksumAddress
 
 
 def fetch_abi(address: ChecksumAddress, headers: Optional[Dict[str, Any]] = None,
-              params: Optional[Dict[str, Any]] = None) -> Optional[Dict[str, Any]]:
-    url = f'https://api.etherscan.io/api?module=contract&action=getabi&address={address}'
+              params: Optional[Dict[str, Any]] = None, key: Optional[str] = None) -> Optional[Dict[str, Any]]:
+    url = f'https://api.etherscan.io/api?module=contract&action=getabi&address={address}&apikey={key}'
     response = requests.get(url, headers=headers, params=params)
     response.raise_for_status()
     data = response.json()