Installation and Basic Usage

Installation

You can install the UserOpSDK directly from GitHub:

npm install github:nerochain/aa-userop-sdk

Or using yarn:

yarn add github:nerochain/aa-userop-sdk

Basic Usage

This section covers the essential steps to start using the UserOpSDK.

Importing the SDK

import { Client, Presets } from 'userop';

Configuration Constants

Set up your configuration with the necessary contract addresses and service endpoints:

// Chain configuration
const NERO_RPC_URL = "https://rpc-testnet.nerochain.io";
const BUNDLER_URL = "https://bundler.service.nerochain.io";
const PAYMASTER_URL = "https://paymaster-testnet.nerochain.io";
 
// Contract addresses
const ENTRYPOINT_ADDRESS = "0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789";
const ACCOUNT_FACTORY_ADDRESS = "0x9406Cc6185a346906296840746125a0E44976454";

Initializing the Client

// Initialize the AA Client
const client = await Client.init(NERO_RPC_URL, {
  overrideBundlerRpc: BUNDLER_URL,
  entryPoint: ENTRYPOINT_ADDRESS,
});

Creating a SimpleAccount Builder

The SimpleAccount builder helps you create and configure UserOperations:

// accountSigner is the EOA wallet that will own the AA wallet
const builder = await Presets.Builder.SimpleAccount.init(
  accountSigner,
  NERO_RPC_URL,
  {
    overrideBundlerRpc: BUNDLER_URL,
    entryPoint: ENTRYPOINT_ADDRESS,
    factory: ACCOUNT_FACTORY_ADDRESS,
  }
);

Next Steps

Now that you’ve installed, initialized the client and builder, you can:

Overview Working with AA Wallets