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@horizon-protocol/ethcall
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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.
Powered by abi-coder and ethers.js.
npm install ethcall
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 (wrapper on top of tryAggregate
method).tryEach(calls, canFail)
: execute all calls in a single request. Ignores reverted calls and returns null
value in place of return data for the calls that are allowed to fail (wrapper on top of aggregate3
method).calls
: list of helper call methods
getEthBalance(address)
: returns account ether balanceimport { InfuraProvider } from '@ethersproject/providers';
import { Contract, Provider } from 'ethcall';
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();
All Mulitcall contracts are stored in src/multicall.ts
file. There are three getMulticall
methods corresponding to three Multicall versions. To add a new contract, you need to know its version, address, chain id of the underlying chain, and (optionally) block at which the Multicall contract was deployed.
If you query a chain on which Multicall is not deployed, or if you query a historical block before the deployment of the contract, the deployless version will be used instead. In short, deployless Multicall "emulates" the deployed contract and returns the exact same data. Note that you can't query ETH balance using deployless version.
You can read more about deployless Multicall here.
FAQs
ethers.js-compatible wrapper around Multicall
The npm package @horizon-protocol/ethcall receives a total of 18 weekly downloads. As such, @horizon-protocol/ethcall popularity was classified as not popular.
We found that @horizon-protocol/ethcall demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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