# ByteDance Seedance 2.0 Fast Reference to Video API

> ByteDance's most advanced reference-to-video model in its fast tier delivering lower latency and cost without compromising on cinematic output, native audio, multi-shot editing, and director-level camera control for professional-grade video creation.

Source: https://www.sandbase.ai/model/bytedance/seedance/2.0/fast/reference-to-video
API reference: https://www.sandbase.ai/model/bytedance/seedance/2.0/fast/reference-to-video/docs

## Facts

- Provider: ByteDance
- Type: Video model
- Model ID: `bytedance/seedance/2.0/fast/reference-to-video`
- Price: From $0.85 per run (15% off list price)
- Capabilities: reference to video
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

- Unified Run API: `POST https://api.sandbase.ai/v1/run`

```bash
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "bytedance/seedance/2.0/fast/reference-to-video",
  "images": [
    "https://static.sandbase.ai/examples/bfl/flux-1/fill/input_image_0.jpeg",
    "https://static.sandbase.ai/examples/alibaba/wan/2.2/animate/replace/input_image_0.png"
  ],
  "prompt": "Room is slowly getting filled from empty state to fully organized with furnitures. Camera is fixed timelapse.",
  "duration": 5,
  "resolution": "720p",
  "generate_audio": true
}'
```

The response returns a run id; poll `GET https://api.sandbase.ai/v1/run/{id}` until the status is `completed` or `failed`.

## FAQ

### How do I call ByteDance Seedance 2.0 Fast Reference to Video through SandBase?

Create a SandBase API key, then send requests with the model ID "bytedance/seedance/2.0/fast/reference-to-video" to Unified Run API (/v1/run) at https://api.sandbase.ai. The request examples on this page show the exact payload.

### Do I need a separate ByteDance account?

No. One SandBase API key and balance gives you access to ByteDance Seedance 2.0 Fast Reference to Video and the other models in the catalog; you do not need to sign up with ByteDance separately.

## README

### Seedance 2.0 Fast Reference to Video

Seedance 2.0 Fast reference-to-video: combine reference images, up to 3 reference videos, and reference audio to lock a character, set, motion, or voice in a new clip.

#### Fields

| Field | Type | Default | Notes |
|---|---|---|---|
| `prompt` | string, required | — | Up to 50,000 characters. |
| `images` | image URL[] | — | Reference images, Image 1, Image 2, … |
| `videos` | video URL[] (≤3) | — | Reference clips (up to 3), Video 1, Video 2, … |
| `audios` | audio URL[] | — | Reference audio, Audio 1, Audio 2, … |
| `duration` | `auto` / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 | 5 | Output length in seconds (4–15), or `auto` to let the model choose. |
| `aspect_ratio` | `16:9` / `9:16` / `1:1` / `4:3` / `3:4` | — | Output frame shape. |
| `resolution` | `480p` / `720p` | `720p` | Sets the per-second rate. |
| `generate_audio` | boolean | true | Native dialogue, music, and effects. Same price on or off. |
| `seed` | integer -1–4294967295 | random | Fix it to compare prompt changes; `-1` is random. |

#### Billing

Without reference videos you pay for output seconds: $0.10 at 480p, $0.20 at 720p. With reference videos, the input video seconds (at least 2) are added to the output length and billed at a lower rate: $0.065 at 480p, $0.13 at 720p. With `duration: "auto"` the quote assumes 15 seconds and the final charge uses the generated length.

| Output | 480p | 720p |
|---|---|---|
| 5s, images only | $0.50 | $1.00 |
| 10s, images only | $1.00 | $2.00 |
| 5s + 5s reference video | $0.65 | $1.30 |
| 10s + 10s reference video | $1.30 | $2.60 |

Failed runs are not charged.

#### Prompting

- Give each reference a role: “Image 1 is the dancer, Video 1 sets the choreography, Audio 1 is the music”.
- Numbering follows array order within each type.

#### Limits

- Reference video seconds count toward billing (minimum 2, up to 15).

#### Also on SandBase

Other Seedance 2.0 Fast endpoints and tiers: `bytedance/seedance/2.0/fast/text-to-video`, `bytedance/seedance/2.0/fast/image-to-video`, `bytedance/seedance/2.5/reference-to-video`, `bytedance/seedance/2.0/reference-to-video`, `bytedance/seedance/2.0/mini/reference-to-video`.