## Introduction

This guide shows how to create and submit a Limit Order v4 using the [@1inch/limit-order-sdk](https://github.com/1inch/limit-order-sdk) on Ethereum.

## Before You Start

- You must have a valid **1inch API Key**. You can get one from the [1inch Business](https://business.1inch.com/portal).
- Your wallet must have:
  - USDC on Ethereum (for the maker asset)
  - ETH for the token approval transaction

## Integration Pattern

1. **Approve Tokens** - Grant the Limit Order Protocol contract permission to spend your tokens
2. **Initialize SDK** - Create an SDK instance with your API key and network
3. **Configure Traits** - Set expiration and nonce via `MakerTraits`
4. **Create Order** - Build a properly formatted order with the SDK
5. **Sign Order** - Sign with EIP-712 typed data (no gas required)
6. **Submit Order** - Send the signed order to the 1inch Orderbook API

## Interactive Code Example

Explore the minimal quick-start implementation (~90 lines):

<stackblitz example="limit-order" file="src/quick-start.ts" />

For a more comprehensive example with provider-agnostic design and balance checks, see `src/create-limit-order.ts` in the same project.