erc20lookup

ERC20Lookup

Lookup multiple ERC20 token's metadata and store it in contract.erc20 hash.

import { lookup } from 'erc20lookup';
import { ethers } from 'ethers'; // ethers v6 or v5 supported

const provider = new ethers.JsonRpcProvider('https://cloudflare-eth.com/v1/mainnet');
const usdt = new ethers.Contract('0xdAC17F958D2ee523a2206206994597C13D831ec7', ERC20_ABI, provider);
await lookup(provider, [ usdt ]);

console.log(usdt.erc20.symbol);
console.log(usdt.erc20.name);
console.log(usdt.erc20.decimals);

Usage

See test/erc20lookupTest.mjs

Deployments and networks

Deployment addresses are hardcoded inside index.mjs.

The following networks are currently supported:

chainId	Network	Address
0x01	Ethereum	0x6e7285c3E47c242e3aD62eDD5D0F19886F1e7ef0
0x89	Polygon	0xFe35BC1Ff694883dE8D31f3a87C5a668BCE765B0
0xa4b1	Arbitrum	0x2a20c66948373c7F619b32737c0bFa1dDa94E6E4
0x2105	Base	0x2C923114fC052D93BDda932DAe1a49668C17b0F0
0x38	BNB	0x9a8D6BB3c45E100c8456a8295C8b90b993bE20D4
43114	Avalanche	0xCbCB78054731a6FCCa53920959033810Ff0A7D1d
0xfa	Fantom	0xD07b8Ddbb60aA59648F8697A2faCbDa4C8ed4994
0x0a	Optimistic	0xEF0Bb05F544b8540E538B958257C466dcB7347D0
0x4e454152	Aurora	0x48cF154a086bAB5492A8D150f4d87a74eCf90743
0xa0c71fd	Blast Testnet (Sepolia)	0x529dbe909c6461b6fa5cA85A52DCd09087182675
0x61	BNB Testnet	0x73E068e9c7ffc91F463ca5464E77E6826D84E3A5
0xaa36a7	Ethereum Sepolia	0x746418DB600352A808709f2048E797ab0918C581
0x05	Goerli Testnet	0x1a7f041dDC8919D26dB38E186E00e6E36dCCA0E6

Overriding contract address

Need to use your own deployment? Specify the contract address in the ERC20_LOOKUP_CONTRACT_ADDRESS env variable or supply it as a third argument to lookup:

await lookup(provider, [ usdt ], '0x....');

Ethers support

We support both v5 and v6, but none is listed in this module's dependencies. You'll have to install ethers manually to run tests:

npm install --no-save ethers

Tests

Node module tests

npm install --no-save ethers
npm run test

Solidity tests

npm install
hardhat test