> ## Documentation Index
> Fetch the complete documentation index at: https://cinch-api.crex.page/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication

> Authenticate with our API to get started

## Introduction

You'll need to authenticate your requests to access any of the endpoints in the CREX API. In this guide, we'll look at how the authentication works.

## Getting the key

CREX's engineering team will issue you a API key. You need to use this key to make all the requests.

## Using the API key

When making requests, you will need to include the API key in the headers of the request.

```bash Example request with API key theme={null}
curl -G https://api.gocrex.com/api/device-model-emissions
  -H "X-API-Key: {api-token}"
```

Always keep your api key safe and reset it if you suspect it has been compromised.