> ## Documentation Index
> Fetch the complete documentation index at: https://etherspot.fyi/llms.txt
> Use this file to discover all available pages before exploring further.

# ERC4337

## Overview

This page provides a simplified overview of ERC-4337, aiming to help developers grasp the basic concepts of its different components and their integration for application development.

ERC-4337 consists of four main components: UserOperations, Bundlers, EntryPoint, and Contract Accounts. Paymasters and Aggregators can also complement these components.

Components of ERC-4337:

**UserOperations**: These are pseudo-transaction objects generated by your application, facilitating the execution of transactions with contract accounts.

**Bundlers**: These are actors responsible for gathering UserOperations from a mempool and transmitting them to the EntryPoint contract on the blockchain.

**EntryPoint**: This is a singleton smart contract that handles the verification and execution logic for transactions.

**Contract Accounts**: These are smart contract accounts owned by users.

**Paymasters**: These optional smart contract accounts can sponsor transactions for Contract Accounts.

**Aggregators**: These optional smart contracts can validate signatures for multiple Contract Accounts.