Seedance 2.0 Fast

Use doubao-seedance-2.0-fast to create video output. This page contains the complete request needed for this model.

Model facts

Property	Value
Model ID	`doubao-seedance-2.0-fast`
Endpoint	`POST /api/v1/generation/create`
Output	Video
Modes	text-to-video, image-to-video, video reference, audio reference
Pricing	View current pricing

Minimal request


curl -X POST https://api.api-stock.com/api/v1/generation/create \
  -H "Authorization: Bearer $API_STOCK_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "doubao-seedance-2.0-fast",
  "input": {
    "prompt": "A cinematic scene with soft natural light"
  }
}'

The create response contains a task ID:


{
  "code": 200,
  "data": {
    "taskId": "019ca881-9503-7270-a560-f00fc2b15785",
    "status": "not_started",
    "createdAt": "2026-08-22T12:00:00.000Z"
  }
}

Parameters

Parameters belong inside the top-level input object. Unknown fields are rejected.

Parameter	Type	Required	Default	Description
`prompt`	string	No	—	Video content description. Required unless image or video reference media is provided (maximum 4000 characters). max 4000 chars
`duration`	number	No	`5`	Video duration in seconds (4-15) min 4, max 15
`size`	“adaptive” \| “16:9” \| “9:16” \| “1:1” \| “4:3” \| “3:4” \| “21:9”	No	`"16:9"`	Video aspect ratio. adaptive follows the input image or video.
`seed`	number	No	—	Random seed for controlling randomness
`generateAudio`	boolean	No	`true`	Whether to generate audio
`nsfwCheck`	boolean	No	`false`	Run Apimart prompt/image moderation before generation
`returnLastFrame`	boolean	No	`false`	Whether to return the last frame image
`imageUrls`	string[]	No	—	Public image URLs for image-to-video (maximum 9)
`imageWithRoles`	object[]	No	—	Images with explicit first_frame / last_frame roles. Cannot be combined with other reference-media fields. Each item is { url: string, role: string }.
`videoUrls`	string[]	No	—	Public reference-video URLs (maximum 3; total duration must be more than 1.8s and less than 15.2s). Their duration is probed before charging.
`audioUrls`	string[]	No	—	Public reference-audio URLs (maximum 3; 15 seconds total). Requires imageUrls or videoUrls.
`tools`	object[]	No	—	Optional enhancements such as web search grounding. Each item is { type: “web_search” }.
`resolution`	“480p” \| “720p”	No	`"720p"`	Output resolution and per-second billing tier

Modes

Minimal generation


{
  "model": "doubao-seedance-2.0-fast",
  "input": {
    "prompt": "A cinematic scene with soft natural light"
  }
}

With image urls


{
  "model": "doubao-seedance-2.0-fast",
  "input": {
    "prompt": "A cinematic scene with soft natural light",
    "imageUrls": [
      "https://example.com/input.jpg"
    ]
  }
}

With video urls


{
  "model": "doubao-seedance-2.0-fast",
  "input": {
    "prompt": "A cinematic scene with soft natural light",
    "videoUrls": [
      "https://example.com/input.mp4"
    ]
  }
}

With audio urls


{
  "model": "doubao-seedance-2.0-fast",
  "input": {
    "prompt": "A cinematic scene with soft natural light",
    "imageUrls": [
      "https://example.com/input.jpg"
    ],
    "audioUrls": [
      "https://example.com/input.mp3"
    ]
  }
}

Constraints

prompt: maximum 4000 characters.
duration: minimum 4; maximum 15.
size: allowed: adaptive, 16:9, 9:16, 1:1, 4:3, 3:4, 21:9.
resolution: allowed: 480p, 720p.

Invalid types, unsupported enum values, out-of-range numbers, and missing required fields return HTTP 400 with error.code: "invalid_input". Correct the request rather than retrying it unchanged.

Result

Poll the task or provide a top-level webhook URL in the create request:


curl https://api.api-stock.com/api/v1/task/status/$TASK_ID \
  -H "Authorization: Bearer $API_STOCK_KEY"

A successful media task returns one or more files:


{
  "code": 200,
  "data": {
    "taskId": "019ca881-9503-7270-a560-f00fc2b15785",
    "status": "finished",
    "files": [
      {
        "fileUrl": "https://storage.api-stock.com/result.mp4",
        "fileType": "video"
      }
    ],
    "createdTime": "2026-08-22T12:00:00.000Z"
  }
}

See Tasks and webhooks for terminal statuses, retries and webhook delivery.