ethcall

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; calling contract.call_func_name will yield a call object.
• all(calls): execute all calls in a single request.
• tryAll(calls): execute all calls in a single request. Ignores reverted calls and returns null value in place of return data.
• calls: list of helper call methods
  • getEthBalance(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();