ethcall
Utility library to make calls to Ethereum blockchain.
Uses MakerDAO's Multicall contracts to make multiple requests in a single HTTP query. Encodes and decodes data automatically.
Inspired and powered by ethers.js.
npm install ethcall
API
Contract(address, abi): create contract instance; callingcontract.call_func_namewill yield acallobject.all(calls): execute all calls in a single request.tryAll(calls): execute all calls in a single request. Ignores reverted calls and returnsnullvalue in place of return data.calls: list of helper call methodsgetEthBalance(address): returns account ether balance
Example
import { Contract, Provider } from 'ethcall';
import { InfuraProvider } from '@ethersproject/providers';
import erc20Abi from './abi/erc20.json';
const infuraKey = 'INSERT_YOUR_KEY_HERE';
const provider = new InfuraProvider('mainnet', infuraKey);
const daiAddress = '0x6b175474e89094c44da98b954eedeac495271d0f';
async function call() {
const ethcallProvider = new Provider();
await ethcallProvider.init(provider);
const daiContract = new Contract(daiAddress, erc20Abi);
const uniswapDaiPool = '0x2a1530c4c41db0b0b2bb646cb5eb1a67b7158667';
const ethBalanceCall = ethcallProvider.getEthBalance(uniswapDaiPool);
const daiBalanceCall = daiContract.balanceOf(uniswapDaiPool);
const data = await ethcallProvider.all([ethBalanceCall, daiBalanceCall]);
const ethBalance = data[0];
const daiBalance = data[1];
console.log('eth balance', ethBalance.toString());
console.log('dai balance', daiBalance.toString());
}
call();
