> For the complete documentation index, see [llms.txt](https://developers.coincircuit.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.coincircuit.io/introduction/quick-start.md).

# Quick Start

## Quick Start

Use this guide to get your CoinCircuit integration running fast.

### What to do first

1. Create sandbox API keys.
2. Use the sandbox base URL.
3. Install an SDK or call the API directly.
4. Authenticate requests with `x-api-key`.
5. Configure webhooks.
6. Test with faucet funds.

### Start here

* Use `https://sandbox-api.coincircuit.io`
* Authenticate with the `x-api-key` header
* Test before switching to production

### Next steps

* Set up authentication
* Install an SDK
* Configure webhooks
* Review error handling and rate limits