Revoke.cash comes in as a preventative tool to manage your token allowances and practice proper wallet hygiene. By regularly revoking active allowances, users reduce the chances of becoming victims of allowance exploits. Revoke.cash was created by Rosco Kalis in 2019 and has since grown to be a staple in web3 security. For the Ethereum chain and several other chains, allowance data is retrieved directly from the blockchain. For most other chains, a combination of Etherscan and Covalent APIs are used.