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

# Neuphonic TTS

> Configure Neuphonic text-to-speech with WebSocket streaming in assistant-api.

Neuphonic delivers streaming speech synthesis via WebSocket with multilingual support and adjustable speech speed. Audio is streamed directly into the voice pipeline for low-latency assistant responses.

**Provider identifier:** `neuphonic`

***

## Vault Credential

| Key   | Description                                                   |
| ----- | ------------------------------------------------------------- |
| `key` | Neuphonic API key from [neuphonic.com](https://neuphonic.com) |

***

## Setup

<Steps>
  <Step title="Get a Neuphonic API key">
    Sign in at [neuphonic.com](https://neuphonic.com) → **Dashboard → API Keys** → create a new key.
  </Step>

  <Step title="Add to Rapida vault">
    In the Rapida dashboard → **Credentials → Create Credential**, select provider **Neuphonic**, enter `key` = your API key.
  </Step>

  <Step title="Configure the assistant">
    In the assistant settings → **TTS Provider**, select **Neuphonic**.

    | Option     | Example                                | Description                                                                         |
    | ---------- | -------------------------------------- | ----------------------------------------------------------------------------------- |
    | `voice_id` | `e564ba7e-aa8d-46a2-96a8-8dffedade48f` | Neuphonic voice ID                                                                  |
    | `language` | `en`                                   | Language code: `en`, `de`, `es`, `fr`, `pt`, `it`, `nl`, `pl`, `ru`, `zh`, and more |
    | `speed`    | `1.0`                                  | Speech speed multiplier (0.1–3.0; default `1.0`)                                    |

    Browse available voices in the [Neuphonic voice library](https://neuphonic.com/voices).
  </Step>
</Steps>

***

<CardGroup cols={2}>
  <Card title="Rime TTS" icon="microphone" href="/opensource/services/assistant-api/tts/rime">
    Ultra-low-latency WebSocket TTS alternative
  </Card>

  <Card title="TTS Overview" icon="volume" href="/opensource/services/assistant-api/tts/overview">
    All TTS providers
  </Card>
</CardGroup>