The Viem library has first-class support for Abstract by providing a set of extensions to interact with paymasters, smart contract wallets, and more. This page will walk through how to configure Viem to utilize Abstract’s features.

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1. Installation

Install the viem package. 
npm install viem

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2. Client Configuration

Configure your Viem client using abstractTestnet as the chain and extend it with eip712WalletActions. 
import { createPublicClient, createWalletClient, custom, http } from 'viem'
import { abstractTestnet } from 'viem/chains'
import { eip712WalletActions } from 'viem/zksync'

// Create a client from a wallet
const walletClient = createWalletClient({
  chain: abstractTestnet,
  transport: custom(window.ethereum!),
}).extend(eip712WalletActions()) ;

// Create a client without a wallet
const publicClient = createPublicClient({
  chain: abstractTestnet,
  transport: http()
}).extend(eip712WalletActions());
Learn more on the official viem documentation.

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Reading Blockchain Data

Use a public client to fetch data from the blockchain via an RPC. 
const balance = await publicClient.getBalance({
  address: "0x8e729E23CDc8bC21c37a73DA4bA9ebdddA3C8B6d",
});

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Sending Transactions

Use a wallet client to send transactions to the blockchain. 
const transactionHash = await walletClient.sendTransaction({
  to: "0x8e729E23CDc8bC21c37a73DA4bA9ebdddA3C8B6d",
  data: "0x69",
});

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Paymasters

Viem has native support for Abstract paymasters. Provide the paymaster and paymasterInput fields when sending a transaction. View Viem documentation. 
const hash = await walletClient.sendTransaction({
  to: "0x8e729E23CDc8bC21c37a73DA4bA9ebdddA3C8B6d",
  paymaster: "0x5407B5040dec3D339A9247f3654E59EEccbb6391", // Your paymaster contract address
  paymasterInput: "0x", // Any additional data to be sent to the paymaster
});

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Smart Contract Wallets

Viem also has native support for using smart contract wallets. This means you can submit transactions from a smart contract wallet by providing a smart wallet account as the account field to the client. View Viem documentation. 
import { toSmartAccount, eip712WalletActions } from "viem/zksync";
import { createWalletClient, http } from "viem";
import { abstractTestnet } from "viem/chains";

const account = toSmartAccount({
  address: CONTRACT_ADDRESS,
  async sign({ hash }) {
    // ... signing logic here for your smart contract account
  },
});

// Create a client from a smart contract wallet
const walletClient = createWalletClient({
  chain: abstractTestnet,
  transport: http(),
  account: account, // <-- Provide the smart contract wallet account
}).extend(eip712WalletActions());

// ... Continue using the wallet client as usual (will send transactions from the smart contract wallet)