---
name: 9router-tts
description: Text-to-speech via 9Router /v1/audio/speech using OpenAI / ElevenLabs / Deepgram / Edge TTS / Google TTS / Hyperbolic / Inworld voices. Use when the user wants to convert text to speech, generate audio, voiceover, narrate, or read text aloud.
---

# 9Router — Text-to-Speech

Requires `NINEROUTER_URL` (and `NINEROUTER_KEY` if auth enabled). See main 9router skill for setup.

## Discover

```bash
curl $NINEROUTER_URL/v1/models/tts | jq '.data[].id'
curl "$NINEROUTER_URL/v1/models/info?id=el/eleven_multilingual_v2"
curl "$NINEROUTER_URL/v1/audio/voices?provider=edge-tts&lang=vi" | jq '.data[].model'
```

## Endpoint

`POST $NINEROUTER_URL/v1/audio/speech`

| Field | Required | Notes |
|---|---|---|
| `model` | yes | voice ID from `/v1/models/tts` |
| `input` | yes | text to speak |

Query `?response_format=mp3` (default, raw bytes) or `?response_format=json` (`{audio: base64, format}`).

## Provider quirks (model format)

| Provider | `model` format | Notes |
|---|---|---|
| `openai` | `tts-1/alloy` (model/voice) or just voice | Default model `gpt-4o-mini-tts` |
| `elevenlabs` | `<model_id>/<voice_id>` or `<voice_id>` | Default model `eleven_flash_v2_5` |
| `openrouter` | `openai/gpt-4o-mini-tts/alloy` | Streamed via chat-completions audio modality |
| `edge-tts` | voice id e.g. `vi-VN-HoaiMyNeural` | **noAuth** |
| `google-tts` | language code e.g. `en`, `vi` | **noAuth** |
| `deepgram` | `aura-asteria-en` etc | Token auth |
| `nvidia`, `inworld`, `cartesia`, `playht` | `model/voice` | Provider-specific auth header |
| `coqui`, `tortoise` | speaker / voice id | Localhost noAuth |
| `hyperbolic` | model id | Body = `{text}` only |