Package Exports

@thinkanddev/ethcall
@thinkanddev/ethcall/lib/index.js

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Readme

ethcall

Utility library to make calls to Ethereum blockchain. Forked from https://github.com/Destiner/ethcall

Uses MakerDAO's Multicall contracts to make multiple requests in a single HTTP query. Encodes and decodes data automatically. For RSK see Think and Dev Multicall contracts

Inspired and powered by ethers.js.

npm install @thinkanddev/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.
sendAll(calls, signer): executes all send transactions to the blockchain in a single request. Remember that the msg.sender will be the multicall contract address)
calls: list of helper call methods
- getEthBalance(address): returns account ether balance

Example

import { Contract, Provider } from '@thinkanddev/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();
    const chainId = (await provider.getNetwork()).chainId
    await ethcallProvider.init(provider, chainId);

    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();