# Utilities

zksync-web3 provides some useful utilities for zkSync builders. They can be imported the following way:

import { utils } from "zksync-web3";

Most of the utilities are used internally by the zkSync team. So this document will describe only those which should be helpful for you.

# The "address" of ether

While formally ether is a token with address 0x000000000000000000000000000000000000800a on zkSync, we use the "zero address" as a more user-friendly alias:

export const ETH_ADDRESS = "0x0000000000000000000000000000000000000000";

# ABI of zkSync smart contract

export const ZKSYNC_MAIN_ABI = new utils.Interface(require("../abi/ZkSync.json"));

# IERC20 interface

Convenient when interacting with native tokens on zkSync.

export const IERC20 = new utils.Interface(require("../abi/IERC20.json"));

# Encoding paymaster params

Utility method that returns the correctly formed paymasterParams object for the common paymaster flows.

export function getPaymasterParams(paymasterAddress: Address, paymasterInput: PaymasterInput): PaymasterParams;

The definition of the PaymasterInput can be found here.

# Default pubdata price limit

Currently, there is no method to accurately estimate the required ergsPerPubdataLimit. That's why for now, it is highly recommended to provide the DEFAULT_ERGS_PER_PUBDATA_LIMIT. Users are not charged more by providing it. Later on it will be possible to query the current recommended limit.

Last Updated: 8/30/2022, 2:33:15 PM