token-approval-checker

name	token-approval-checker
description	Check ERC20 token approvals for a wallet address, identify unlimited approvals and risky spenders, and suggest revocations.
version	1.0.0
author	aidamidami
tags	["web3","security","approval","erc20","allowance","revoke"]
triggers	[{"type":"keyword","keywords":["token approval","allowance","revoke","revoke approval","unlimited approval"],"priority":85}]
parameters	[{"name":"address","type":"string","required":true,"description":"Wallet address to check"},{"name":"chain","type":"string","required":false,"description":"Chain (ethereum, polygon, arbitrum, optimism, base)"}]
prerequisites	{"env_vars":["ETHERSCAN_API_KEY"]}
scripts	{"enabled":true,"working_directory":"./scripts","definitions":[{"name":"approval_checker","description":"Scan ERC20 approvals for an address and assess risk","type":"python","file":"approval_checker.py","timeout":60}]}

Token Approval Checker

Check ERC20 token approvals for a wallet address: identify unlimited approvals and unknown spenders, and get revocation suggestions.

Features

• Scan Approval events for tokens the address has interacted with
• Flag unlimited approvals
• Distinguish known safe spenders (e.g. Uniswap routers) from unknown ones
• Output actionable revocation recommendations

Environment Variables

Variable	Required	Description
ETHERSCAN_API_KEY	Recommended	Etherscan API Key; rate limits apply without it

Input Example

{
  "address": "0x...",
  "chain": "ethereum"
}

Best Practices

1. Review approvals periodically and revoke unused ones
2. Prioritize revoking unlimited approvals and unknown spenders
3. Use Revoke.cash or call approve(spender, 0) on the token contract to revoke