ethers-multicall
β‘ π Call multiple view functions, from multiple Smart Contracts, in a single RPC query!
Querying an RPC endpoint can be very costly (100+ queries) when loading data from multiple smart contracts. With multicall, batch these queries into a single, on-chain query, without additional over-head!
This is the standalone package of the library formerly created & used by Zapper.
Install
npm install @morpho-labs/ethers-multicall
yarn add @morpho-labs/ethers-multicall
Usage
import { ethers } from "ethers";
import { EthersMulticall } from "@morpho-labs/ethers-multicall";
const provider = new ethers.providers.JsonRpcBatchProvider("...");
// pass the chainId as option (second parameter, defaults to 1 = mainnet)
const multicall = new EthersMulticall(provider);
// if the chainId is unknown, defaults to the provider's network chainId
// const multicall = await EthersMulticall.new(provider)
// if you want to query with overrides (such as a blockTag), pass them as options:
// const multicall = new EthersMulticall(provider, { chainId, overrides: { blockTag } })
// or manually change them:
// multicall.overrides.blockTag = 14999999
const uni = multicall.wrap(
new ethers.Contract("0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984", UniswapAbi)
); // make sure to always wrap contracts to benefit from multicalls
Promise.all([uni.name(), uni.symbol(), uni.decimals()]).then(console.log);
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