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