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

# Overview

The Gelato Paymaster & Bundler provides infrastructure for Account Abstraction, supporting both ERC-4337 and EIP-7702 standards. Sponsor gas fees, enable ERC-20 payments, and integrate with any smart account provider.

## What is ERC-4337?

ERC-4337 implements account abstraction without requiring protocol changes. Instead of users sending transactions directly, they sign **UserOperations** that are collected by **Bundlers** and submitted to the network through an **EntryPoint** contract.

| Component         | Description                                                                       |
| ----------------- | --------------------------------------------------------------------------------- |
| **UserOperation** | A pseudo-transaction containing the user's intent, gas parameters, and signature  |
| **Bundler**       | Collects UserOperations and submits them as a single transaction (Gelato Bundler) |
| **EntryPoint**    | Singleton contract that validates and executes UserOperations                     |
| **Paymaster**     | Sponsors transaction fees on behalf of users (Gelato Gas Tank)                    |
| **Smart Account** | Contract wallet that validates UserOperations (Kernel, Safe, etc.)                |

<Note>
  EIP-7702 is complementary to ERC-4337. It upgrades EOAs to smart accounts that can then use ERC-4337 infrastructure for gas sponsorship and batching.
</Note>

## Gelato Bundler Features

<Columns cols={2}>
  <Card title="Payment Methods" icon="credit-card" href="/paymaster-&-bundler/features/paymnet-methods">
    Sponsor gas, pay with ERC-20 tokens, or use native tokens
  </Card>

  <Card title="Implementation Paths" icon="code" href="/paymaster-&-bundler/features/implementation-paths">
    Gelato SDK, Viem/Permissionless, or direct API
  </Card>

  <Card title="Smart Accounts" icon="wallet" href="/paymaster-&-bundler/features/smart-accounts">
    Gelato, Kernel, Safe, Alchemy, Biconomy, and more
  </Card>

  <Card title="Embedded Wallets" icon="user" href="/paymaster-&-bundler/features/embedded-wallets">
    Dynamic, Privy, Web3Auth, Turnkey integrations
  </Card>

  <Card title="EIP-7702 Support" icon="bolt" href="/paymaster-&-bundler/features/EIP-7702 support">
    Use your EOA as a smart account - no asset transfers needed
  </Card>

  <Card title="How-To Guides" icon="book" href="/paymaster-&-bundler/how-to-guides/create-a-api-key">
    Step-by-step implementation guides
  </Card>
</Columns>