Models/bytedance/seedance-2-fast

Seedance 2.0 Fast

prospolabs/seedance-2-fast

ByteDance's fast-tier unified audio-video model. Generates 4-15s clips at 720p with synchronized audio at no extra cost. Reference mode accepts up to 9 images, 3 videos, and 3 audio clips — compose multi-modal scenes by referencing them in the prompt as @Image1 / @Video1 / @Audio1.

ByteDanceReference to VideoCommercial useAudio incl.text-to-videoimage-to-videoreferenceaudio

Up to 40% off

Starts from

$0.070/ second

Retail $0.117

Pay-as-you-go — no subscription, no tokens.

Call the Seedance 2.0 Fast API on Prospolabs with a single POST to /v1/generate using model id seedance-2-fast and a mode field (one of: text, image, reference). The API and the playground share the same USD price — $0.07/sec (480p) or $0.15/sec (720p) — audio included, 40% off market. Each call returns a generation_id and an output_url valid for 7 days, and failed runs are auto-refunded.

Quickstart

Send a POST request to /v1/generate with your API key. The model id is seedance-2-fast and a mode field selecting which input shape you're sending..

Generate a clip from a text prompt.

curl -X POST "https://api.prospolabs.com/v1/generate" \
  -H "Authorization: Bearer $PROSPOLABS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
        "model": "seedance-2-fast",
        "mode": "text",
        "prompt": "A hummingbird hovering near a sunlit flower, slow motion",
        "resolution": "720p",
        "duration": 5,
        "aspect_ratio": "16:9",
        "generate_audio": true,
        "seed": 0
      }'

Backed by bytedance/seedance-2.0/fast/text-to-video.

Supported parameters for Text → Video

Parameter	Type	Default	Notes
mode	string	text	Required. One of: text, image, reference.
prompt	string	—	Required.
resolution	string	720p	One of: 480p, 720p.
duration	number	5	Range: 4–15.
aspect_ratio	string	16:9	One of: 16:9, 9:16, 1:1, 4:3, 3:4, 21:9.
generate_audio	boolean	true
seed	number	—

Response

{
  "generation_id": "gen_abc123",
  "status": "completed",
  "model": "seedance-2-fast",
  "mode": "text",
  "estimated_cost_usd": 0.60,
  "output_url": "https://cdn.prospolabs.com/...",
  "duration_ms": 2143
}

Output retention: output_url is valid for 7 days after generation. After that, requests return HTTP 410 Gone with { "code": "output_expired" }. Download anything you want to keep.