Multicall

Multicall simply aggregates multiple contract calls into a single JSON RPC request.

Overview

In order to extract a large amount of data in an efficient way we have used Uniswap Multicall Contract for all JSON RPC requests in adapters.

We have coded a JS wrapper over the contracts and placed it in the abi module of our adapter SDK @spockanalytics/base. You can use it for contract calls in your project adapter.

Multicall.singleContractMultipleData

Execute multiple inputs for a single contract.

Usage

abi.Multicall.singleContractMultipleData<Erc20>({
    address: '0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2',
    chain: 1,
    contractInterface: Erc20_factory.createInterface(),
    fragment: 'balanceOf',
    callInput: ['0xF04a5cC80B1E94C69B48f5ee68a08CD2F09A7c3E','0x2F0b23f53734252Bda2277357e97e1517d6B042A']
});

Argument	Type	Description
address	string	contract address
blockNumber	number optional	Block number at which you want to query
chain	number	Network chainId
contractInterface	Interface	Interface of contract generated through typechain
fragment	string	Method name of contract
callInput	OptionalMethodInputs	Input parameters

Multicall.multipleContractMultipleData

Execute multiple inputs for multiple contracts.

Usage

abi.Multicall.multipleContractMultipleData<Erc20>({
    address: ['0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2','0x37c997b35c619c21323f3518b9357914e8b99525'],
    chain: 1,
    contractInterface: Erc20_factory.createInterface(),
    fragment: 'balanceOf',
    callInput: ['0xF04a5cC80B1E94C69B48f5ee68a08CD2F09A7c3E','0x2F0b23f53734252Bda2277357e97e1517d6B042A']
})

Argument	Type	Description
address	string[]	Contract addresses
blockNumber	number optional	Block at which you want to query
chain	number	Network chainId
contractInterface	Interface	Interface of contract generated through typechain
fragment	string	Method name of contract
callInput	OptionalMethodInputs	Input parameters

Multicall.multipleContractSingleData

Execute single input for multiple contracts.

Usage

abi.Multicall.multipleContractSingleData<Erc20>({
    address: ['0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2','0x37c997b35c619c21323f3518b9357914e8b99525'],
    chain: 1,
    contractInterface: Erc20_factory.createInterface(),
    fragment: 'balanceOf',
    callInput: ['0xF04a5cC80B1E94C69B48f5ee68a08CD2F09A7c3E']
})

Argument	Type	Description
address	string	Contract address
blockNumber	number optional	Block at which you want to query
chain	number	Network chainId
contractInterface	Interface	Interface of contract generated through typechain
fragment	string	Method name of contract
callInput	OptionalMethodInputs optional	Input parameters

Multicall.execute

Execute multiple calls in one request.

Usage

const WETH = '0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2';
const contractInterface = Erc20_factory.createInterface();

const calls = [
  new abi.Call<Erc20>({address:WETH, contractInterface, fragment:"name"}),
  new abi.Call<Erc20>({address:WETH, contractInterface, fragment:"symbol"}),
  new abi.Call<Erc20>({address:WETH, contractInterface, fragment:"decimals"})
];

abi.Multicall.execute({calls, chain:1});

Call

Argument	Type	Description
address	string	Contract address
contractInterface	Interface	Interface of contract generated through typechain.
fragment	string	Method name of contract
callInput	OptionalMethodInputs optional	Input parameters

Execute

Argument	Type	Description
blockNumber	number optional	Block at which you want to query
calls	Call[]	Calls to be executed
chain	number	Network chainId
disableChunk	boolean	Disable chunk calls on out of gas error

Call Params

import { BigNumber } from '@ethersproject/bignumber';

type MethodArg = string | number | BigNumber;
type OptionalMethodInputs =
  | Array<MethodArg | MethodArg[] | undefined>
  | undefined;

Call Result

The return type of each method.

//each method return an array of CallResult promise
// Promise<Array<CallResult>>

interface CallResult {
  call: {
    address: string;
    input: OptionalMethodInputs;
  };
  output: any;
  success: boolean;
}