Do you want to swap 10 DAI for ETH? Sure thing, we'll just need your approval to spend a BAJILLION DOLLARS!
Do you ever feel uneasy about the different dapps that you gave approval to spend ERC20 tokens from your account? revoke.cash allows you to inspect all the contracts you've approved to spend money on your behalf, and revoke their access for the ones you no longer need. If you don't want to completely revoke access, it's also possible to update the amount they are allowed to spend instead.
This repository also includes the dapp-contract-list, which is a mapping of smart contract addresses to the corresponding application. This allows revoke.cash to display application names like Aave or Compound instead of their smart contract addresses. This list can be used by any other application. The name mapping for an address can be accessed through either of these URLs:
https://raw.githubusercontent.com/rkalis/revoke.cash/master/public/dapp-contract-list/{chainId}/{address}.jsonhttps://revoke.cash/dapp-contract-list/{chainId}/{address}.json
Revoke.cash natively supports Ethereum (mainnet and testnets), Gnosis Chain, Metis, SmartBCH, Syscoin and Ethereum Classic.
It also supports Avalanche, Polygon, BSC, Arbitrum, Optimism, RSK, Fantom, Harmony and several other chains through a backend integration with Etherscan, Blockscout, CovalentHQ & Alchemy. Performance for these chains may be slower due to rate limits.
If you want to learn more about (unlimited) ERC20 allowances, I wrote an article on my blog: Unlimited ERC20 allowances considered harmful.
git clone [email protected]:rkalis/revoke.cash.git
cd revoke.cash
yarn
yarn dev
An .example.env file is provided that needs to be copied into a .env file and filled out.
Some of these variables are integral to the functioning of Revoke.cash. NEXT_PUBLIC_INFURA_API_KEY which is used for reading data from Ethereum Mainnet + Testnets. NODE_URLS is used for reading data from Optimism Mainnet + Testnet. COVALENT_API_KEYS is used for certain chains such as RSK and Harmony. ETHERSCAN_API_KEYS is used for many of the other chains such as Polygon or Avalanche. If you omit any of these variables, Revoke.cash will not work for the chains you omitted.
Then there are a few less essential variables. IRON_SESSION_PASSWORD is used for encrypting session cookies and can be filled with any random 32-character string. NEXT_PUBLIC_ALCHEMY_API_KEY is used for ENS and UNS name resolutions - if omitted those resolutions will not work. NEXT_PUBLIC_AMPLITUDE_API_KEY is used for Analytics - if omitted, no Analytics are collected. UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN are used for queueing third-party API calls - these are only necessary when hosting in a serverless environment such as Vercel.
Website created by Rosco Kalis after discussing the idea with Paul Berg at Devcon 5 in Osaka. Uses ethers.js for all Ethereum-related operations and Etherscan, CovalentHQ & Alchemy for extended multichain support. Built with Next.js, Tailwind and TypeScript. Uses Upstash for queueing.