Use Seedance 2.0 Fast through Rivya Public API v1 with model id seedance-2-fast, supported inputs, parameters, Files API rules, credits, and response examples.

Available via APIText or URL ready; reference modes use Files APIVideo

API model id

seedance-2-fast

Inputs

text, file

Files API

Required for reference modes

Base credits

per_input_and_output_second · 480p_with_video=6.8 · 480p_without_video=11.7 · 720p_with_video=15 · 720p_without_video=24.8 · ⌈total⌉

Capability

Video

Billing

METERED

Prompt limit

20000 characters

Request contract

Send the model id at the top level. Model-specific controls belong in params.

Key	Type	Required	Default	Description
model	string	Yes	seedance-2-fast	Use the seedance-2-fast API model id.
prompt	string	Yes	-	Maximum 20000 characters for this model.
params	object	No	-	Model-specific parameter object. Use the rows below for allowed keys.
client_request_id	string	No	-	Optional client-side id for tracing requests in your system.

Model parameters

Key	Type	Required	Default	Range	Options	Description
seedance_scene	select	No	text	-	text, frames, reference	Selects which Seedance 2 path to run: pure text-to-video, first-frame / first-last-frame guidance, or multimodal reference generation.
resolution	select	No	720p	-	480p, 720p	Resolution
aspect_ratio	select	No	16:9	-	1:1, 4:3, 3:4, 16:9, 9:16, 21:9, adaptive	Aspect ratio
duration	number	No	5	min 4 / max 15	-	Duration
generate_audio	select	No	true	-	true, false	Generate audio
return_last_frame	select	No	false	-	false, true	Also returns the final frame as a still image, which is useful for covers, follow-up runs, or later editing.
web_search	select	No	false	-	false, true	Web search
nsfw_checker	select	No	false	-	false, true	NSFW checker

Upload policy

Upload reference files first, then place the returned URL and duration token inside params.referenceMediaItems.

Reference rule

Multimodal reference: Frames: 1–2 signed images. Reference: up to 9 JPEG/PNG/WebP/BMP/TIFF/GIF images under 30 MB each, 3 MP4/MOV videos of 2–15 seconds under 50 MB each, and 3 MP3/WAV audio clips of 2–15 seconds under 15 MB each. Video and audio each have a separate 15-second total limit.

Max files

Accepted file kinds

image, video, audio

Duration token

Video and audio references should carry durationToken from /api/v1/files when duration verification is required.

kind	Max size	MIME types
image	30 MB	image/jpeg, image/png, image/webp, image/bmp, image/gif, image/tiff
video	50 MB	video/mp4, video/quicktime
audio	15 MB	audio/mpeg, audio/wav, audio/x-wav

Minimal request

{
  "model": "seedance-2-fast",
  "prompt": "A cinematic product reveal with smooth camera movement",
  "params": {
    "seedance_scene": "text",
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "duration": 5,
    "generate_audio": "true",
    "return_last_frame": "false",
    "web_search": "false",
    "nsfw_checker": "false"
  }
}

Reference-file request

{
  "model": "seedance-2-fast",
  "prompt": "A cinematic product reveal with smooth camera movement",
  "params": {
    "seedance_scene": "reference",
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "duration": 5,
    "generate_audio": "true",
    "return_last_frame": "false",
    "web_search": "false",
    "nsfw_checker": "false",
    "seedance_reference_videos": [
      {
        "url": "https://cdn.example.com/reference-video.mp4",
        "durationSeconds": 8,
        "durationToken": "video_duration_token_from_files_api",
        "sizeBytes": 8388608,
        "mimeType": "video/mp4"
      }
    ],
    "videoMetadata": [
      {
        "url": "https://cdn.example.com/reference-video.mp4",
        "token": "video_metadata_token_from_files_api",
        "sizeBytes": 8388608
      }
    ]
  }
}

Create response

The create endpoint returns a public task id. Poll the status endpoint until the task succeeds or fails.

{
  "id": "task_seedance_2_fast_example",
  "status": "queued",
  "model": "seedance-2-fast",
  "reserved_credits": 124,
  "final_credits": 0,
  "settlement_status": "RESERVED",
  "created_at": "2026-05-11T00:00:00.000Z",
  "updated_at": "2026-05-11T00:00:00.000Z",
  "result": null,
  "error": null
}

Common errors

validation_failed, insufficient_credits, idempotency_conflict, rate_limited, not_found

Some modes require Files API reference uploads.

Seedance 2.0 Fast API Integration