# Seedance 2.0 Fast Reference to Video API

> El modo más rápido y económico de Seedance 2.0 con varias referencias, en 480p o 720p y con sonido.

Referencia hasta 9 imágenes, 3 vídeos y 3 clips de audio como @Image1, @Video1 y @Audio1 en el prompt para obtener una escena de 4 a 15 segundos con sonido sincronizado en 480p o 720p. Se requiere al menos una imagen o vídeo y se admiten como máximo 12 archivos en total; los vídeos de referencia deben sumar entre 2 y 15 segundos y el audio de referencia, como máximo 15 segundos. Los vídeos de referencia se cobran también por su propia duración, por lo que los clips con referencias de vídeo cuestan más por segundo.

- Model id: `bytedance/seedance-2.0/fast/reference-to-video`
- Made by: ByteDance
- Category: Reference to Video
- Output: video
- Price: from $0.113 / second (4 s ≈ $0.452) (cheapest run $0.452 (452 API credits))
- Run: `POST https://api.doitong.ru/v1/run/bytedance/seedance-2.0/fast/reference-to-video`
- Quote: `POST https://api.doitong.ru/v1/quote/bytedance/seedance-2.0/fast/reference-to-video`
- Docs page: https://doitong.com/es-ES/developers/models/bytedance/seedance-2.0/fast/reference-to-video

## Pricing

Price: **from $0.113 / second (4 s ≈ $0.452)** (the lowest tier; the quote prices your exact input). Billed per second of output (`duration`, default 15).

Price rules (the first rule that matches the input wins; a parameter you leave out counts as its default):

- When `video_urls` is set and `duration` ≤ 4: by `resolution`, 480p: $0.113, 720p: $0.243 / second
- When `video_urls` is set and `duration` ≤ 5: by `resolution`, 480p: $0.113, 720p: $0.243 / second
- When `video_urls` is set and `duration` ≤ 6: by `resolution`, 480p: $0.113, 720p: $0.243 / second
- When `video_urls` is set and `duration` ≤ 7: by `resolution`, 480p: $0.113, 720p: $0.243 / second
- When `video_urls` is set and `duration` ≤ 8: by `resolution`, 480p: $0.113, 720p: $0.243 / second
- When `video_urls` is set and `duration` ≤ 9: by `resolution`, 480p: $0.113, 720p: $0.243 / second
- When `video_urls` is set and `duration` ≤ 10: by `resolution`, 480p: $0.113, 720p: $0.243 / second
- When `video_urls` is set and `duration` ≤ 11: by `resolution`, 480p: $0.113, 720p: $0.243 / second
- When `video_urls` is set and `duration` ≤ 12: by `resolution`, 480p: $0.113, 720p: $0.243 / second
- When `video_urls` is set and `duration` ≤ 13: by `resolution`, 480p: $0.113, 720p: $0.243 / second
- When `video_urls` is set and `duration` ≤ 14: by `resolution`, 480p: $0.113, 720p: $0.243 / second
- When `video_urls` is set: by `resolution`, 480p: $0.113, 720p: $0.243 / second

The full example input below costs $0.565 = 565 API credits (5 s × 113 API credits).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). `POST https://api.doitong.ru/v1/quote/bytedance/seedance-2.0/fast/reference-to-video` 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

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 |
|---|---|---|---|---|---|---|
| `prompt` |  | string | yes |  |  | Prompt de texto que guía la generación de vídeo. |
| `image_urls` | `images` | array of image URL | no |  | ≤ 9 items | Referencias de imagen para guiar el vídeo, limitadas a 9 imágenes y sujetas a un máximo de 12 archivos entre todas las modalidades. Cada imagen puede ocupar como máximo 30 MB y debe usar JPEG, PNG o WebP. Usa @Image1, @Image2 y las etiquetas numeradas posteriores para identificar estas referencias en el prompt. |
| `video_urls` | `videos` | array of video URL | no |  | ≤ 3 items | Referencias de vídeo para la generación, proporcionadas como archivos MP4 o MOV e identificadas en el prompt mediante @Video1, @Video2 y las etiquetas numeradas posteriores. Cada una debe tener una resolución desde aproximadamente 480p (640x640) hasta aproximadamente 720p (834x1112). El conjunto está limitado a 3 vídeos que sumen menos de 50 MB, con una duración total de 2 a 15 segundos. |
| `audio_urls` | `audios` | array of audio URL | no |  | ≤ 3 items | Las referencias de audio para guiar el vídeo requieren al menos una referencia de imagen o vídeo complementaria. Proporciona archivos MP3 o WAV de un máximo de 15 MB cada uno, con no más de 3 archivos y una duración total máxima de 15 segundos. Identifícalos en el prompt mediante @Audio1, @Audio2 y las etiquetas numeradas posteriores. |
| `resolution` |  | enum (string) | no | `720p` | `480p`, `720p` | Resolución de salida: 480p prioriza la velocidad de generación, mientras que 720p ofrece una opción equilibrada. |
| `duration` |  | enum (string) | no | `auto` | `auto`, `4`, `5`, `6`, `7`, `8`, `9`, `10`, `11`, `12`, `13`, `14`, `15` | Selección de la duración del vídeo: `auto` delega la elección al modelo mediante el prompt, mientras que una duración explícita debe estar entre 4 y 15 segundos. |
| `aspect_ratio` |  | enum (string) | no | `auto` | `auto`, `21:9`, `16:9`, `4:3`, `1:1`, `3:4`, `9:16` | Relación de aspecto de salida: 16:9 produce formato apaisado, 9:16 formato vertical, 1:1 formato cuadrado y 21:9 formato panorámico cinematográfico. Selecciona `auto` para que el modelo elija la relación. |
| `generate_audio` |  | boolean | no | `true` |  | Activa esta opción para acompañar el vídeo con audio sincronizado. El audio generado incluye habla sincronizada con los movimientos de los labios, ambiente y efectos de sonido. |
| `bitrate_mode` |  | enum (string) | no | `standard` | `standard`, `high` | Elige la tasa de bits de codificación de salida: 'standard' conserva el valor predeterminado, mientras que 'high' solicita al modelo mejorar la calidad de codificación a costa de un archivo más grande. |
| `codec` |  | enum (string) | no | `auto` | `auto`, `H264`, `H265` | Selección del códec de vídeo: `auto` mantiene sin cambios el comportamiento del códec predeterminado, `H264` selecciona H.264 y `H265` selecciona H.265. |

File parameters (`images`, `videos`, `audios`) 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
{
  "prompt": "@Image1 The white sneaker spins slowly on a wet neon street, puddle splashes in slow motion, punchy beat"
}
```

A fuller example:

```json
{
  "prompt": "@Image1 The white sneaker spins slowly on a wet neon street, puddle splashes in slow motion, punchy beat",
  "images": [
    "https://content.doitong.com/images/showcase/v3/gen_sneaker_ad.jpg"
  ],
  "duration": 5,
  "resolution": "480p"
}
```

## 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/bytedance/seedance-2.0/fast/reference-to-video?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "@Image1 The white sneaker spins slowly on a wet neon street, puddle splashes in slow motion, punchy beat",
    "images": [
      "https://content.doitong.com/images/showcase/v3/gen_sneaker_ad.jpg"
    ],
    "duration": 5,
    "resolution": "480p"
  }'

# 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/bytedance/seedance-2.0/fast/reference-to-video?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "@Image1 The white sneaker spins slowly on a wet neon street, puddle splashes in slow motion, punchy beat",
    "images": [
      "https://content.doitong.com/images/showcase/v3/gen_sneaker_ad.jpg"
    ],
    "duration": 5,
    "resolution": "480p"
  }),
});
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 = {
    "prompt": "@Image1 The white sneaker spins slowly on a wet neon street, puddle splashes in slow motion, punchy beat",
    "images": [
        "https://content.doitong.com/images/showcase/v3/gen_sneaker_ad.jpg",
    ],
    "duration": 5,
    "resolution": "480p",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/bytedance/seedance-2.0/fast/reference-to-video", 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": "bytedance/seedance-2.0/fast/reference-to-video",
      "input": {
        "prompt": "@Image1 The white sneaker spins slowly on a wet neon street, puddle splashes in slow motion, punchy beat",
        "images": [
          "https://content.doitong.com/images/showcase/v3/gen_sneaker_ad.jpg"
        ],
        "duration": 5,
        "resolution": "480p"
      },
      "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/seedance-2.0/fast/reference-to-video",
  "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": 565,
    "usd": "0.565",
    "charged": 565,
    "refunded": 0
  },
  "input": {
    "prompt": "@Image1 The white sneaker spins slowly on a wet neon street, puddle splashes in slow motion, punchy beat",
    "images": [
      "https://content.doitong.com/images/showcase/v3/gen_sneaker_ad.jpg"
    ],
    "duration": 5,
    "resolution": "480p"
  },
  "output": {
    "video": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_name": "0-output.mp4",
      "file_size": 1843200
    },
    "seed": 42
  },
  "outputs": [
    {
      "type": "video",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_size": 1843200,
      "width": 1280,
      "height": 720,
      "duration": 5,
      "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 |
|---|---|---|
| `video` | object {url, content_type, file_name, file_size} | Archivo de vídeo producido por la generación. |
| `seed` | integer | Valor de semilla aplicado durante la generación. |

## Related models

- [Seedance 2.0 Fast Text to Video](https://doitong.com/developers/models/bytedance/seedance-2.0/fast/text-to-video.md) (`bytedance/seedance-2.0/fast/text-to-video`): from $0.113 / second
- [Seedance 2.0 Mini Text to Video](https://doitong.com/developers/models/bytedance/seedance-2.0/mini/text-to-video.md) (`bytedance/seedance-2.0/mini/text-to-video`): from $0.0721 / second
- [Seedance 2.0 Text to Video](https://doitong.com/developers/models/bytedance/seedance-2.0/text-to-video.md) (`bytedance/seedance-2.0/text-to-video`): from $0.141 / second
- [Seedance 2.0 Fast Image to Video](https://doitong.com/developers/models/bytedance/seedance-2.0/fast/image-to-video.md) (`bytedance/seedance-2.0/fast/image-to-video`): from $0.113 / second
- [Seedance 2.0 Image to Video](https://doitong.com/developers/models/bytedance/seedance-2.0/image-to-video.md) (`bytedance/seedance-2.0/image-to-video`): from $0.141 / second
- [Seedance 2.0 Mini Image to Video](https://doitong.com/developers/models/bytedance/seedance-2.0/mini/image-to-video.md) (`bytedance/seedance-2.0/mini/image-to-video`): from $0.0721 / second
- [Seedance 2.0 Mini](https://doitong.com/developers/models/bytedance/seedance-2.0/mini/reference-to-video.md) (`bytedance/seedance-2.0/mini/reference-to-video`): $0.007 / 1000 tokens
- [Seedance 2.0 Reference to Video](https://doitong.com/developers/models/bytedance/seedance-2.0/reference-to-video.md) (`bytedance/seedance-2.0/reference-to-video`): from $0.141 / second

## Links

- HTML page: https://doitong.com/developers/models/bytedance/seedance-2.0/fast/reference-to-video
- 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/seedance-2.0/fast/reference-to-video
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.ru/v1/models/bytedance/seedance-2.0/fast/reference-to-video