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

# Introduction

> Introduction to using AICaller APIs

## Welcome

AICaller offers standard REST APIs to trigger AI phone calls to your users.
Explore the documentation here and feel free to [chat with us](https://app.aicaller.io/chat-with-us) to get help.

## Authentication

All API endpoints are authenticated using API Key. You can use the [AI Caller dashboard](https://app.aicaller.io/dashboard/api-secret-keys) to generate your API keys. You need to send the API key value in the request header key `aicaller-api-key` like shown below.

```json theme={null}
"headers": {
  "aicaller-api-key": "YOUR_API_KEY"
}
```

## Rate limits

We offer fair usage limits which is sufficient for most users. If you exceed the rate limit you will get status `429` in response to your request.

If you plan to have high volumes, you can [chat with us](https://app.aicaller.io/chat-with-us) to get help.

## Supported languages

We currently support english language. We plan to add support for other languages in the near future.

## Supported countries

We can call more than 100+ countries in the world. we can easily support more countries, please [chat with us](https://app.aicaller.io/chat-with-us) to get help.