# Bytedance Seed Speech Text to Speech API

> Text-to-Speech mat ville Preset-Stëmmen, Steierung vu Geschwindegkeet, Pitch a Volume an Instruktiounen am geschwatene Stil

Konvertéiert bis zu 5000 Zeeche vun `text` an Audio. Wielt eng `voice` a setzt optional eng `language` fest oder loosst d'Automatesch-Erkennung aktiv. `speed` a `volume` leie vun 0.5 bis 2, `pitch` geet vun -12 bis 12 Halleftéin, an `voice_instruction` steiert d'Aussprooch. D'Ausgab ass mp3 oder opus mat Samplingraten vun 8000 bis 48000 Hz.

- Model id: `bytedance/seed-speech/tts/v2`
- Made by: ByteDance
- Category: Text to Speech
- Output: audio
- Price: $0.03 / 1000 characters (cheapest run $0.03 (30 API credits))
- Run: `POST https://api.doitong.com/v1/run/bytedance/seed-speech/tts/v2`
- Quote: `POST https://api.doitong.com/v1/quote/bytedance/seed-speech/tts/v2`
- Docs page: https://doitong.com/lb/developers/models/bytedance/seed-speech/tts/v2

## Pricing

Price: **$0.03 / 1000 characters**. Billed per character of `text` (the price is per 1000 characters).

The full example input below costs $0.002 = 2 API credits (50 characters × 30 API credits / 1000 characters).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). `POST https://api.doitong.com/v1/quote/bytedance/seed-speech/tts/v2` with the same JSON body returns the exact price for that input; the quote is exactly what a run charges. Invalid input is never charged and failed or canceled requests are refunded automatically.

## Input parameters

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `text` |  | string | yes |  | ≤ 5000 characters | Text, deen a synthetiséiert Ried ëmgewandelt gëtt. |
| `voice` |  | enum (string) | no | `stokie_en` | `vivi_mixed_en_zh_ja_es_id`, `mindy_en_es_id_pt_zh`, `stokie_en`, `dacey_en`, `tim_en`, `kian_en_zh`, `cedric_en_zh`, `sophie_en_zh`, `jean_en_zh`, `magnus_en_zh`, `mabel_en_zh`, `nadia_en_zh`, `opal_en_zh`, `pearl_en_zh`, `quentin_en_zh`, `vienna_mixed_en_zh`, `alina_mixed_en_zh`, `corinne_mixed_en_zh`, `esther_mixed_en_zh`, `freya_mixed_en_zh`, `gigi_mixed_en_zh`, `holly_mixed_en_zh`, `lyla_mixed_en_zh`, `daisy_mixed_en_zh`, `tracy_es_zh`, `jess_ja_es_id_pt_en_zh`, `pinky_es_ko_mixed_en_zh`, `sweety_ja_es`, `sandy_es_mixed_en_zh`, `sven_de`, `minimi_ja`, `usseau_fr`, `felipe_es`, `han_id`, `martins_pt`, `enzo_it`, `shane_ko`, `bonnie_zh`, `felix_zh`, `celeste_zh`, `monkey_king_zh` | Preset vun der Synthees-Stëmm, identifizéiert duerch en Numm, deen och ënnerstëtzt Sproochecoden enthält. D'Sproochënnerstëtzung ka separat sinn, wéi bei 'en_zh', oder eng nahtlos Vermëschung vun Englesch a Chinesesch erméiglechen, uginn duerch 'mixed_en_zh'. |
| `output_format` |  | enum (string) | no | `mp3` | `mp3`, `opus` | Audio-Output-Kodéierung: 'mp3' produzéiert MP3, wärend 'opus' Opus an engem Ogg-Container produzéiert. |
| `sample_rate` |  | enum (integer) | no | `24000` | `8000`, `16000`, `22050`, `24000`, `32000`, `44100`, `48000` | Sampling-Frequenz a Hz fir den Output-Audio. |
| `speed` |  | number | no | `1` | 0.5 – 2 | Multiplikator fir d'Riedegeschwindegkeet: 1.0 ass d'Normalgeschwindegkeet, 0.5 d'Hallschent an 2.0 déi duebel Geschwindegkeet. |
| `volume` |  | number | no | `1` | 0.5 – 2 | Lautstäerkt-Multiplikator: 1.0 ass déi normal Lautstäerkt, 0.5 d'Hallschent an 2.0 déi duebel Lautstäerkt. |
| `pitch` |  | integer | no | `0` | -12 – 12 | Upassung vun der Stëmmhéicht, gemooss a Semitonen: 0 ännert d'Héicht net, -12 senkt se ëm eng Oktav an 12 hëlt se ëm eng Oktav erop. |
| `language` |  | enum (string) \| null | no |  | `zh`, `en`, `ja`, `es-mx`, `id`, `pt-br`, `ko`, `it`, `de`, `fr` | Iwwerschreiwe vun der Lies-Sprooch: Wann de Wäert feelt, gëtt d'Sprooch automatesch erkannt, a zweesproocheg Stëmme kënnen Chinesesch an Englesch nahtlos vermëschen; wann e geliwwert gëtt, gëtt d'Erkennung deaktivéiert an d'Liesen op eng Sprooch limitéiert. Wielt Chinesesch mat zh, Englesch mat en, Japanesch mat ja, Mexikanesch Spuenesch mat es-mx, Indonesesch mat id, Brasilianescht Portugisesch mat pt-br, Koreanesch mat ko, Italienesch mat it, Däitsch mat de oder Franséisch mat fr. |
| `voice_instruction` |  | string \| null | no |  |  | Optional Instruktioun an natierlecher Sprooch fir d'Ausliwwerung, wéi 'Speak in a cheerful tone' oder 'Could you speak a bit slower?'. Si kann Toun, Emotioun, Lautstäerkt a Tempo steieren. |

## Example input

Required parameters only:

```json
{
  "text": "Hello from Doitong. This is a short test sentence."
}
```

A fuller example:

```json
{
  "text": "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.com/v1/run/bytedance/seed-speech/tts/v2?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "text": "Hello from Doitong. This is a short test sentence."
  }'

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

### JavaScript

```javascript
const API = "https://api.doitong.com/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/bytedance/seed-speech/tts/v2?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "text": "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.com/v1"
headers = {"Authorization": "Bearer " + os.environ["DOITONG_API_KEY"]}

payload = {
    "text": "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/bytedance/seed-speech/tts/v2", 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.com/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": "bytedance/seed-speech/tts/v2",
      "input": {
        "text": "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": "bytedance/seed-speech/tts/v2",
  "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": 2,
    "usd": "0.002",
    "charged": 2,
    "refunded": 0
  },
  "input": {
    "text": "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.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `audio` | object {url, content_type, file_name, file_size} | Audio-Datei, déi duerch d'Generatioun erstallt gouf. |

## 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
- [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
- [Chatterboxhd · Text to Speech](https://doitong.com/developers/models/resemble-ai/chatterboxhd/text-to-speech.md) (`resemble-ai/chatterboxhd/text-to-speech`): $0.0108 / run

## Links

- HTML page: https://doitong.com/developers/models/bytedance/seed-speech/tts/v2
- 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=bytedance/seed-speech/tts/v2
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/bytedance/seed-speech/tts/v2