# Index TTS 2.0 API

> Tổng hợp giọng nói từ đoạn giọng tham chiếu và văn bản, với khả năng điều khiển cảm xúc qua âm thanh, lời nhắc hoặc cường độ cho từng cảm xúc

Tạo giọng nói cho văn bản trong `prompt`, sử dụng giọng từ đoạn tham chiếu được cung cấp qua `audio_url`. Có thể lấy phong cách cảm xúc từ đoạn thứ hai bằng `emotional_audio_url`, điều chỉnh theo `strength` (0 đến 1), hoặc đặt qua `emotional_strengths`. Ngoài ra, bật `should_use_prompt_for_emotion`, tùy chọn kèm `emotion_prompt` riêng. Âm thanh được trả về dưới dạng đối tượng base64.

- Model id: `index-tts-2/text-to-speech`
- Made by: bilibili
- Category: Text to Speech
- Output: audio
- Charged by usage (up to $0.06 per run, typical $0.016; the rest of the hold is refunded): $0.002 / second of generated audio (cheapest run $0.016 (16 API credits))
- Run: `POST https://api.doitong.ru/v1/run/index-tts-2/text-to-speech`
- Quote: `POST https://api.doitong.ru/v1/quote/index-tts-2/text-to-speech`
- Docs page: https://doitong.com/vi/developers/models/index-tts-2/text-to-speech

## Pricing

Price: **$0.002 / second of generated audio**. Charged by actual usage at $0.002 / second of generated audio: up to $0.06 per run (the quote gives the maximum for your input), the rest is refunded automatically after the run. A typical run costs $0.016.

The full example input below holds up to $0.06 = 60 API credits (up to 30 s of generated audio × $0.002) when it starts; a typical run costs $0.016 (16 API credits).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). This model is charged by usage: `POST https://api.doitong.ru/v1/quote/index-tts-2/text-to-speech` with the same JSON body returns the most the run can cost for that input (`credits`, debited when the run starts); after the run you pay the usage the model reports and the rest is refunded automatically. An input whose maximum would exceed the per-run limit is refused with 422. Invalid input is never charged and failed or canceled requests are refunded automatically.

## Input parameters

Send either the canonical name or the native field name (not both). Canonical names are the same across models.

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `audio_url` | `audio` | string (audio URL) | yes |  |  | Tệp âm thanh nguồn dùng để tạo giọng nói. |
| `prompt` |  | string | yes |  |  | Lời nhắc cho giọng nói cần tạo. |
| `emotional_audio_url` |  | string (audio URL) \| null | no |  |  | Tệp âm thanh tham chiếu dùng để trích xuất phong cách cảm xúc. |
| `strength` |  | number | no | `1` | 0 – 1 | Ảnh hưởng cảm xúc áp dụng trong chuyển đổi phong cách tăng theo thiết lập cường độ này. |
| `emotional_strengths` |  | object {happy, angry, sad, afraid, disgusted, melancholic, surprised, calm} \| null | no |  |  | Các giá trị cường độ theo từng cảm xúc để điều chỉnh chi tiết. |
| `emotional_strengths.happy` |  | number | no | `0` | 0 – 1 | Cường độ của cảm xúc hạnh phúc. |
| `emotional_strengths.angry` |  | number | no | `0` | 0 – 1 | Cường độ của sự tức giận. |
| `emotional_strengths.sad` |  | number | no | `0` | 0 – 1 | Cường độ của sự buồn bã. |
| `emotional_strengths.afraid` |  | number | no | `0` | 0 – 1 | Cường độ của sự sợ hãi. |
| `emotional_strengths.disgusted` |  | number | no | `0` | 0 – 1 | Cường độ của sự ghê tởm. |
| `emotional_strengths.melancholic` |  | number | no | `0` | 0 – 1 | Cường độ của sự u sầu. |
| `emotional_strengths.surprised` |  | number | no | `0` | 0 – 1 | Cường độ của sự ngạc nhiên. |
| `emotional_strengths.calm` |  | number | no | `0` | 0 – 1 | Cường độ của sự bình tĩnh. |
| `should_use_prompt_for_emotion` |  | boolean \| null | no | `false` |  | Khi được bật, tính toán cảm xúc dựa trên lời nhắc sẽ thay thế `emotional_strengths` rõ ràng. Phong cách cảm xúc lấy từ `emotion_prompt` nếu được cung cấp, nếu không sẽ lấy từ `prompt`. |
| `emotion_prompt` |  | string \| null | no |  |  | Chỉ dẫn về phong cách cảm xúc, đồng thời yêu cầu sử dụng `should_use_prompt_for_emotion`. |
| `enable_safety_checker` |  | boolean | no | `true` |  | Có thể nới lỏng việc kiểm duyệt bằng cách đặt thành false, nếu người gọi được cấp quyền. |

File parameters (`audio`, `emotional_audio_url`) take a public `https://` URL, a `data:` URI up to 10 MB, or the `file_url` of an upload from `POST /files`.

## Example input

Required parameters only:

```json
{
  "audio": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
  "prompt": "Hello from Doitong. This is a short test sentence."
}
```

A fuller example:

```json
{
  "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
  "prompt": "Hello from Doitong. This is a short test sentence."
}
```

## Run it

Set `DOITONG_API_KEY` to a key from https://doitong.com/developers/dashboard#keys. `?wait=20` returns the finished request in the same call when it is ready within 20 seconds; otherwise poll `GET /requests/{id}` (it also accepts `?wait=`), or pass `webhook_url`.

### curl

```bash
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://api.doitong.ru/v1/run/index-tts-2/text-to-speech?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
    "prompt": "Hello from Doitong. This is a short test sentence."
  }'

# Still "queued" or "running"? Poll with the id from the response:
curl "https://api.doitong.ru/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"
```

### JavaScript

```javascript
const API = "https://api.doitong.ru/v1";
const headers = {
  "Authorization": "Bearer " + process.env.DOITONG_API_KEY,
  "Content-Type": "application/json",
};

// Run the model; wait up to 20 s for the finished result in the same call
let res = await fetch(API + "/run/index-tts-2/text-to-speech?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
    "prompt": "Hello from Doitong. This is a short test sentence."
  }),
});
let request = await res.json();
if (!res.ok) throw new Error(request.error.code + ": " + request.error.message);

// Not finished yet: long-poll until it is
while (request.status === "queued" || request.status === "running") {
  res = await fetch(API + "/requests/" + request.id + "?wait=20", { headers });
  request = await res.json();
}
if (request.status !== "succeeded") throw new Error(JSON.stringify(request.error));
console.log(request.outputs.map((o) => o.url), request.cost.credits + " API credits ($" + request.cost.usd + ")");
```

### Python

```python
import os
import requests

API = "https://api.doitong.ru/v1"
headers = {"Authorization": "Bearer " + os.environ["DOITONG_API_KEY"]}

payload = {
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
    "prompt": "Hello from Doitong. This is a short test sentence.",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/index-tts-2/text-to-speech", params={"wait": 20}, json=payload, headers=headers)
request = r.json()
if not r.ok:
    raise RuntimeError(request["error"]["code"] + ": " + request["error"]["message"])

# Not finished yet: long-poll until it is
while request["status"] in ("queued", "running"):
    request = requests.get(API + "/requests/" + request["id"], params={"wait": 20}, headers=headers).json()
if request["status"] != "succeeded":
    raise RuntimeError(request["error"])
print([o["url"] for o in request["outputs"]], request["cost"]["credits"], "API credits", "$" + request["cost"]["usd"])
```

### MCP

The MCP server at `https://api.doitong.ru/v1/mcp` exposes the tools `search_models`, `get_model`, `quote`, `run`, `get_request`, `cancel_request`, `list_requests`, `create_upload` and `get_account`. A `run` call for this model:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "run",
    "arguments": {
      "model_id": "index-tts-2/text-to-speech",
      "input": {
        "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
        "prompt": "Hello from Doitong. This is a short test sentence."
      },
      "wait_seconds": 20
    }
  }
}
```

## Response

Every call returns a request object. `status` is one of `queued`, `running`, `succeeded`, `failed`, `canceled`. `outputs` lists the generated files with URLs on our storage (kept forever, or 7 days with `?storage=temporary`; `storage` says which); `output` is the model's own result object with the same URLs.

```json
{
  "id": "req_8k2m4q7x1z9c3v5b6n0p2r4t",
  "object": "request",
  "model": "index-tts-2/text-to-speech",
  "status": "succeeded",
  "created_at": "2026-10-20T12:00:00Z",
  "started_at": "2026-10-20T12:00:02Z",
  "completed_at": "2026-10-20T12:00:09Z",
  "queue_position": null,
  "cost": {
    "credits": 60,
    "usd": "0.06",
    "charged": 60,
    "refunded": 0
  },
  "input": {
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
    "prompt": "Hello from Doitong. This is a short test sentence."
  },
  "output": {
    "audio": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp3",
      "content_type": "audio/mpeg",
      "file_name": "0-output.mp3",
      "file_size": 1843200
    }
  },
  "outputs": [
    {
      "type": "audio",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp3",
      "content_type": "audio/mpeg",
      "file_size": 1843200,
      "duration": 12,
      "stored": true
    }
  ],
  "error": null,
  "metrics": {
    "inference_seconds": 6.8
  },
  "urls": {
    "self": "https://api.doitong.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `audio` | object {url, content_type, file_name, file_size} | Âm thanh được tạo và mã hóa ở định dạng base64. |

## Related models

- [Eleven v4 Text to Speech](https://doitong.com/developers/models/elevenlabs/tts/eleven-v4.md) (`elevenlabs/tts/eleven-v4`): $0.08 / 1000 characters
- [MiniMax Speech 2.8 HD](https://doitong.com/developers/models/minimax/speech-2.8-hd.md) (`minimax/speech-2.8-hd`): $0.10 / 1000 characters
- [Async Text to Speech Pro V1.0](https://doitong.com/developers/models/async/tts-pro/v1.0.md) (`async/tts-pro/v1.0`): $0.01 / 1000 characters
- [Bytedance Seed Speech Text to Speech](https://doitong.com/developers/models/bytedance/seed-speech/tts/v2.md) (`bytedance/seed-speech/tts/v2`): $0.03 / 1000 characters
- [Chatterbox · Speech to Speech](https://doitong.com/developers/models/chatterbox/speech-to-speech.md) (`chatterbox/speech-to-speech`): $0.015 / minute of input audio
- [Chatterbox · Text to Speech](https://doitong.com/developers/models/chatterbox/text-to-speech.md) (`chatterbox/text-to-speech`): $0.025 / 1000 characters
- [Chatterbox · Text to Speech · Multilingual](https://doitong.com/developers/models/chatterbox/text-to-speech/multilingual.md) (`chatterbox/text-to-speech/multilingual`): $0.025 / 1000 characters
- [Chatterboxhd · Speech to Speech](https://doitong.com/developers/models/resemble-ai/chatterboxhd/speech-to-speech.md) (`resemble-ai/chatterboxhd/speech-to-speech`): $0.02 / minute of input audio

## Links

- HTML page: https://doitong.com/developers/models/index-tts-2/text-to-speech
- All models and guides for AI agents: https://doitong.com/developers/llms.txt
- OpenAPI 3.1 with this model's typed request body: https://doitong.com/developers/openapi.json?model=index-tts-2/text-to-speech
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.ru/v1/models/index-tts-2/text-to-speech