## Introduction

This guide shows how to perform a cross-chain swap between two EVM chains using 1inch Fusion+.

## 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 at least $1 of USDC on the source chain

## Integration Pattern

1. **Initialize SDK** - Create an SDK instance with your API key and blockchain provider
2. **Check Allowance** - Ensure the source token is approved for the Aggregation Router
3. **Fetch Quote** - Get cross-chain pricing for your swap
4. **Generate Secrets** - Create cryptographic secrets for escrow locking
5. **Place Order** - Submit the signed order with hashlock and secret hashes
6. **Monitor & Submit Secrets** - Poll for escrow deployment, then reveal secrets to finalize

## Interactive Code Example

Explore the minimal quick-start implementation:

<stackblitz example="cross-chain-swap" file="src/quick-start.ts" />

For a more comprehensive example with balance checks and config-driven chain selection, see `src/swap-erc20-cross-chain.ts` in the same project.