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

# Audio Narration API - Listen to the Urantia Book

> Access multi-voice TTS audio for every paragraph of the Urantia Book. 6 voices, 2 models, full coverage of 14,500+ paragraphs.

Every paragraph includes an `audio` field — a nested object keyed by TTS model and voice, or `null` if no audio exists.

## Response shape

```json theme={null}
{
  "audio": {
    "tts-1-hd": {
      "nova": {
        "format": "mp3",
        "url": "https://audio.urantia.dev/tts-1-hd-nova-3:119.1.5.mp3"
      },
      "echo": {
        "format": "mp3",
        "url": "https://audio.urantia.dev/tts-1-hd-echo-3:119.1.5.mp3"
      }
    },
    "tts-1": {
      "alloy": {
        "format": "mp3",
        "url": "https://audio.urantia.dev/tts-1-alloy-3:119.1.5.mp3"
      }
    }
  }
}
```

## Available models and voices

Coverage varies per paragraph. The `tts-1-hd` / `nova` combination has full coverage across all 14,500+ paragraphs.

| Model      | Voices                                              |
| ---------- | --------------------------------------------------- |
| `tts-1-hd` | `nova`, `echo`, `onyx`, `alloy`, `fable`, `shimmer` |
| `tts-1`    | `alloy`                                             |

## Accessing audio

Audio URLs are included in responses from all paragraph-returning endpoints: `/search`, `/paragraphs/*`, `/papers/:id`, and the dedicated `/audio/:ref` endpoint.

```bash theme={null}
# Get just the audio info for a paragraph
curl https://api.urantia.dev/audio/119:1.5
```

All audio files are served from `audio.urantia.dev` via Cloudflare CDN.