> ## Documentation Index
> Fetch the complete documentation index at: https://docs.meru.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication

> Authentication process

# API Key Authentication

Meru APIs use **API key authentication** to secure access to our services. This is a simple and secure method where you include your unique API key in the request headers.

## API Environments

Meru provides two environments for API access:

### Production Environment

```
https://stablecoin-api.getmeru.com
```

### Sandbox Environment

```
https://stablecoin-api.sandbox.getmeru.com
```

Use the **sandbox environment** for testing and development, and the **production environment** for live transactions.

## How It Works

1. **Obtain your API key** from your Meru dashboard or account settings
2. **Include the API key** in the `api-key` header of your HTTP requests
3. **The server validates** your API key and grants access to the requested resources

## Implementation

### Request Header Format

Include your API key in the `api-key` header using this format:

```js theme={null}
'api-key': '<api-key>'
```

**Note:** All API endpoints use API key authentication only.