> ## 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.

# Implementation Paths

There are three ways to integrate Gelato's Paymaster & Bundler into your application. Choose the approach that best fits your development workflow and requirements.

## Gelato Gasless SDK

The `@gelatocloud/gasless` SDK provides the simplest integration path with built-in abstractions for smart accounts, payment methods, and transaction handling.

* Handles smart account creation and management automatically
* No paymaster configuration required for any payment method
* Built-in support for sponsored, ERC-20, and native token payments
* Automatic gas estimation and transaction polling
* Recommended for new projects and rapid development

## Viem / Permissionless

For developers already using Viem or Permissionless in their stack, Gelato Bundler integrates seamlessly as a standard ERC-4337 bundler endpoint.

* Use your existing smart account setup and tooling
* Compatible with any smart account implementation (Kernel, Light Account, Safe, etc.)
* Requires paymaster configuration for ERC-20 and native token payments
* Full control over transaction construction and gas parameters
* Ideal for projects with existing account abstraction infrastructure

## Direct API

For maximum flexibility or non-JavaScript environments, interact directly with Gelato's JSON-RPC API endpoints.

* Language-agnostic integration via standard HTTP requests
* Full control over request/response handling
* Supports all ERC-4337 bundler methods
* Useful for backend services, mobile apps, or custom implementations
* Requires manual UserOperation construction and signing

## Comparison

| Approach              | Complexity | Flexibility | Paymaster Required       |
| --------------------- | ---------- | ----------- | ------------------------ |
| Gelato Gasless SDK    | Low        | Medium      | No                       |
| Viem / Permissionless | Medium     | High        | Yes (for token payments) |
| Direct API            | High       | Full        | Yes (for token payments) |