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

# Introduction

> ThunderPhone runs production voice agents over real phone calls and embeddable web widgets. Start here.

ThunderPhone lets you build AI voice agents that place and answer
real phone calls and power mic-driven conversations on your website.
This documentation set covers three audiences:

<CardGroup cols={3}>
  <Card title="Guides" icon="book" href="/quickstart">
    Concepts, how-tos, and end-to-end tutorials. **Start here** if
    you're new.
  </Card>

  <Card title="API Reference" icon="code" href="/api-reference/introduction">
    Every endpoint, request field, and response shape.
  </Card>

  <Card title="Webhooks" icon="bolt" href="/webhooks/overview">
    Real-time events, signing, and delivery semantics.
  </Card>
</CardGroup>

## What you can build

<CardGroup cols={2}>
  <Card title="Inbound phone support" icon="phone">
    Answer calls to a number you own with an AI agent that follows your
    prompt, uses your tools, and hands off to humans when needed.
  </Card>

  <Card title="Outbound campaigns" icon="arrow-up-right">
    Place programmatic calls from your code — survey, follow-up, or
    confirmation flows.
  </Card>

  <Card title="In-browser voice" icon="microphone">
    Drop our embeddable [web widget](/guides/widget) onto your site for
    customers to click-to-talk. No phone number required.
  </Card>

  <Card title="Test-driven agents" icon="flask">
    Run canned scenarios through your agent in [batches](/api-reference/test-calls)
    so regressions get caught before customers hear them.
  </Card>
</CardGroup>

## Five-minute path

<Steps>
  <Step title="Read the concepts">
    [Concepts](/guides/concepts) — agents, phone numbers, calls, widgets,
    webhooks, tools. 10 minutes.
  </Step>

  <Step title="Run the quickstart">
    [Quickstart](/quickstart) — four API calls to take your first call
    with an AI agent.
  </Step>

  <Step title="Pick a guide">
    Follow a [how-to guide](/guides/handle-inbound-calls) for your
    scenario, or dive into the [API reference](/api-reference/introduction).
  </Step>
</Steps>

## Base URL

```
https://api.thunderphone.com/v1
```

Authentication uses the standard OAuth 2.0 Bearer scheme with an
`sk_live_` organization API key. Your key identifies the target
organization automatically — there is no org id in URL paths. See
[Authentication](/api-reference/introduction) for details.

<Note>
  Need help? Email [support@thunderphone.com](mailto:support@thunderphone.com).
</Note>