Token Approval & Wallet Drainer Shield
Understand how infinite token approvals (MaxUint256) expose your custodial and non-custodial crypto balances to malicious drainer contracts. Learn how to inspect and revoke permissions.
Simulate Allowance Level
Wallet Drainer Exploitation Potential
Granting infinite approval on USDT invokes approve(spender, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff). If the approved dApp is hacked, or if the website was a phishing clone, attackers can call transferFrom() at any future date to drain all your USDT without prompting for your signature again.
Official Blockchain Approval Revoke Tools
How to Audit and Revoke Active Token Approvals
Connect to Revoke Portal
Navigate to official explorer approval portals (Etherscan, Tronscan, or Revoke.cash) and connect your Web3 wallet.
Identify Unlimited Spenders
Filter by Unlimited/Infinite allowances. Identify dApps you no longer use or suspicious unverified addresses.
Execute Revoke Transaction
Click "Revoke" to broadcast an on-chain transaction setting allowance to 0, completely severing smart contract access.