Blockchain Utils

The TypeScript utility package designed for addressing multicall problems in dApp development. Built upon the foundation of the 1inch multicall library.

Install

Node

npm install utils-blockchain

Yarn

yarn add utils-blockchain

Multicall contract addresses

⚠️ The MultiCall contract was not audited yet, so use at your OWN RISK! Syndika does not provide any guarantees or assurances!!!

Mainnet

Name	Address
Ethereum	0x8d035edd8e09c3283463dade67cc0d49d6868063
BSC	0x804708de7af615085203fa2b18eae59c5738e2a9
Polygon	0xe38D748a07a6e3f9911Ec53ed434af2aB65716bc

Testnet

Name	Address
Sepolia	0x069C02e7fF41Fd3d3f0c3fa80Ce0cB3b368aCc31
Goerli	0x20B136D01e87C99F2866f71C2d6Cc027E724AAF7
Mumbai	0xe38D748a07a6e3f9911Ec53ed434af2aB65716bc

Motivation

The purpose of this utility library is to efficiently execute multiple view calls simultaneously. It accomplishes this by taking a list of requests, dividing them into manageable chunks, and making batched calls to the provider. By reducing the number of requests and optimizing the request-response flow, the library significantly speeds up the process.

For instance, when comparing the time taken for 50 balanceOf requests, the difference in request time between a naive approach and the batch approach is substantial.

$ npm run benchmark

> utils-blockchain@0.0.0-development benchmark
> ts-node benchmark/multicall.benchmark.ts

Time spent to make 50 requests using Multicall: 219 ms
----------------------------------------------------------
Time spent to make 50 requests using Promise.all(): 1620 ms
Multicall saved 1401 ms
----------------------------------------------------------
Time spent to make 50 requests using separate calls: 9753 ms
Multicall saved 9534 ms

You can play with various parameters by modifying the benchmark script from benchmark/multicall.banchmark.ts directory and observing the difference.

The default multicall parameters are set as follows:

• maxChunkSize: 500
• retriesLimit: 3
• blockNumber: 'latest'
• gasBuffer: 100000

For better understanding of how requests are packed and all trade-offs made when splitting in batches, please refer to 1inch algorithm visualisation.

Library Usage

Initializing multicall service

import { Multicall } from 'utils-blockchain';

const providerURL = 'https://eth-mainnet.g.alchemy.com/v2/YOUR_API_KEY';
const multicallService = await Multicall.init(providerURL);

Request batch generation

import { Contract } from 'ethers';

const contract = new Contract(
  '0xdAC17F958D2ee523a2206206994597C13D831ec7', // address of the requested contract
  ABI, // abi of the requested contract
  new JsonRpcProvider(providerURL) // JSON-RPC or Web3 provider
);
const functionName = 'balanceOf';
const targetTokenOwners = [
  '0x1212121212121212121212121212121212121212',
  '0x3434343434343434343434343434343434343434',
  '0xabcabcabcabcabcabcabcabcabcabcabcabcabca',
];
const batch = await Promise.all(
  targetTokenOwners.map(address => {
    return multicall.getRequestObject(contract, functionName, [address]);
  })
);

The batch array is formatted in the following way:

[
  {
    to: '0xdAC17F958D2ee523a2206206994597C13D831ec7',
    data: '0x70a082310000000000000000000000001212121212121212121212121212121212121212',
    gas: 146999999
  },
  {
    to: '0xdAC17F958D2ee523a2206206994597C13D831ec7',
    data: '0x70a082310000000000000000000000003434343434343434343434343434343434343434',
    gas: 146999999
  },
  {
    to: '0xdAC17F958D2ee523a2206206994597C13D831ec7',
    data: '0x70a08231000000000000000000000000abcabcabcabcabcabcabcabcabcabcabcabcabca',
    gas: 146999999
  }
]

Multicall request execution

const res = await multicallService.multicall(batch);

The response array denotes the balances of the users specified in the request batch.

[
  '0x000000000000000000000000000000000000000000000000000000000002528f',
  '0x0000000000000000000000000000000000000000000000000000000000000000',
  '0x0000000000000000000000000000000000000000000000000000000000000000'
]