The Hidden Risk in Your Wallet
Every time you swap tokens on Uniswap or deposit into a DeFi protocol, you grant ERC-20 token allowances — permissions that let smart contracts spend your tokens. Most users accumulate dozens of these approvals over time, many with unlimited amounts, creating a silent attack surface. A compromised contract with an active allowance can drain your wallet without needing your private key.
In this article, well build an automated allowance scanner with Python and Web3.py that audits every approval across your address, identifies risky ones, and generates revocation transactions.
What Were Building
Our tool will:
