Text to speech

---
title: Text to speech
description: Synthesize English or Chinese speech with doubao-tts-2.0.
lastUpdated: 2026-07-27
---

```text
POST https://api.nexinfer.com/v1/audio/speech
```

The request requires `model`, `input`, and `voice`. Current verified voices include:

| Language | Voice ID |
|---|---|
| Chinese | `zh_female_vv_uranus_bigtts` |
| English | `en_female_jane_uranus_bigtts` |

```bash
curl https://api.nexinfer.com/v1/audio/speech \
  -H "Authorization: Bearer $NEXINFER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-tts-2.0",
    "input": "Welcome to NexInfer.",
    "voice": "en_female_jane_uranus_bigtts",
    "response_format": "mp3",
    "speed": 1
  }' \
  --output speech.mp3
```

Supported response formats are `mp3`, `wav`, and `opus`. `speed` accepts `0.5` through `2.0`, inclusive. An out-of-range speed returns `400 invalid_request` and is not billed.

Billing is based on the accepted text character count. Check the HTTP status, file signature, duration, and usage log; do not rely on the file extension alone. Do not put keys or private input text in reports.

POST https://api.nexinfer.com/v1/audio/speech

The request requires model, input, and voice. Current verified voices include:

Language	Voice ID
Chinese	`zh_female_vv_uranus_bigtts`
English	`en_female_jane_uranus_bigtts`

curl https://api.nexinfer.com/v1/audio/speech \
  -H "Authorization: Bearer $NEXINFER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-tts-2.0",
    "input": "Welcome to NexInfer.",
    "voice": "en_female_jane_uranus_bigtts",
    "response_format": "mp3",
    "speed": 1
  }' \
  --output speech.mp3

Supported response formats are mp3, wav, and opus. speed accepts 0.5 through 2.0, inclusive. An out-of-range speed returns 400 invalid_request and is not billed.

Billing is based on the accepted text character count. Check the HTTP status, file signature, duration, and usage log; do not rely on the file extension alone. Do not put keys or private input text in reports.