Python Tool Lets Crypto Users Scan and Revoke Risky ERC-20 Token Approvals

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Every DeFi interaction on platforms like Uniswap requires users to grant ERC-20 token allowances, which permit smart contracts to spend wallet funds — often in unlimited amounts. Over time, these accumulated approvals create a security vulnerability, as a compromised contract with an active allowance can drain a wallet without requiring the owner's private key. A developer tutorial published on DEV Community walks through building an automated allowance scanner using Python and the Web3.py library. The tool queries Etherscan's API to retrieve all past approval events for a given wallet address, then classifies each by risk level based on factors like unlimited spend limits or unverified spender contracts. It also generates ready-to-sign revocation transactions that set allowances back to zero, helping users regain control of their on-chain permissions.

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