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

# Introduction

> Simple AI API reference

## Base URL

All API requests are made to:

```text theme={null}
https://api.usesimple.ai/api/v1
```

## Authentication

All API endpoints require authentication using an API key. You can find your API key in the Simple AI dashboard under **Settings > API Keys**.

Include your API key in the `Authorization` header as a Bearer token:

```bash theme={null}
Authorization: Bearer YOUR_API_KEY
```

### Example Request

```bash theme={null}
curl -X GET "https://api.usesimple.ai/api/v1/calls" \
  -H "Authorization: Bearer sk_live_12345abcdef"
```

## Response Format

All responses are returned as JSON. Successful requests return a 2xx status code. Error responses include a message describing what went wrong.

## Rate Limits

API requests are rate limited. If you exceed the limit, you will receive a `429 Too Many Requests` response. Back off and retry with exponential backoff.

## Need Help?

If you run into issues with the API, reach out to [support@usesimple.ai](mailto:support@usesimple.ai).