> ## Documentation Index > Fetch the complete documentation index at: https://docs.shuyou.ai/llms.txt > Use this file to discover all available pages before exploring further. # Doubao Seedance 2.0 Fast > Create asynchronous video tasks with doubao-seedance-2.0-fast via POST /v1/predictions. ## OpenAPI ````yaml en/api-reference/video-series/seedance/doubao-seedance-2.0-fast-video-generate.json POST /v1/predictions openapi: 3.1.0 info: title: Doubao Seedance 2.0 Fast Video Generation version: 1.0.0 servers: - url: https://api.shuyou.ai security: - bearerAuth: [] paths: /v1/predictions: post: tags: - Video Generation summary: Doubao Seedance 2.0 Fast description: >- Doubao Seedance 2.0 Fast (`doubao-seedance-2.0-fast`) supports text-to-video and reference-guided generation. Async mode: poll with Get a prediction using `data.task_id`, or use top-level `webhook`. operationId: createDoubaoSeedance20FastVideoPrediction requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/DoubaoSeedance20FastVideoPredictionRequest' examples: text_to_video: summary: Text to video (minimal) value: model: doubao-seedance-2.0-fast input: prompt: >- A cinematic shot of a majestic lion in the savannah at golden hour text_to_video_full: summary: Text to video (full params) value: model: doubao-seedance-2.0-fast input: prompt: A futuristic city skyline at dusk with flying vehicles aspect_ratio: '16:9' resolution: 720P duration: 15 generate_audio: true first_last_frame: summary: First / last frame value: model: doubao-seedance-2.0-fast input: prompt: Smooth transition between the two keyframes aspect_ratio: '16:9' resolution: 480P duration: 8 first_frame_url: https://example.com/first-frame.png last_frame_url: https://example.com/last-frame.png webhook: https://your-domain.com/webhook/video-done with_references: summary: Reference media value: model: doubao-seedance-2.0-fast input: prompt: >- A character walking through a neon-lit street, consistent appearance aspect_ratio: '9:16' resolution: 720P duration: 10 generate_audio: false reference_image_urls: - https://example.com/character-ref.png reference_video_urls: [] reference_audio_urls: [] responses: '200': description: Async task created content: application/json: schema: $ref: '#/components/schemas/PredictionTaskResponse' example: data: task_id: 2c4d50261173430290971a2395a3b607 task_status: processing '400': description: Invalid request content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '402': description: Insufficient quota content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '403': description: Model access denied content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '429': description: Rate limit exceeded content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' components: schemas: DoubaoSeedance20FastVideoPredictionRequest: type: object required: - model - input properties: model: type: string description: Model ID. Use `doubao-seedance-2.0-fast` for this endpoint. enum: - doubao-seedance-2.0-fast default: doubao-seedance-2.0-fast example: doubao-seedance-2.0-fast input: $ref: '#/components/schemas/DoubaoSeedance20FastVideoInput' webhook: type: string format: uri description: >- Optional HTTPS callback URL when the task completes, fails, or is cancelled (Predictions API). PredictionTaskResponse: type: object properties: data: type: object properties: task_id: type: string description: Async task ID. Use with Get a prediction or webhook correlation. example: 2c4d50261173430290971a2395a3b607 task_status: type: string description: Current task status, e.g. `processing`. example: processing required: - task_id - task_status required: - data ErrorResponse: type: object properties: error: type: object properties: code: type: string message: type: string type: type: string DoubaoSeedance20FastVideoInput: type: object required: - prompt properties: prompt: type: string description: Text prompt describing the video to generate. maxLength: 1000 example: A cinematic shot of a majestic lion in the savannah at golden hour aspect_ratio: type: string description: >- Aspect ratio of the generated video. Default `16:9`. Note: only `16:9` and `9:16` are supported at runtime; other values may be rejected. enum: - '16:9' - '9:16' - '1:1' - '3:4' - '4:3' - '21:9' default: '16:9' example: '16:9' resolution: type: string description: Resolution of the generated video. Default `720P`. enum: - 480P - 720P default: 720P example: 720P duration: type: integer description: Duration of the generated video in seconds. Default `15`. enum: - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 default: 15 example: 15 generate_audio: type: boolean description: Whether to generate audio for the video. Default `true`. default: true example: true first_frame_url: type: string format: uri description: URL of the first frame of the video. last_frame_url: type: string format: uri description: URL of the last frame of the video. reference_image_urls: type: array description: >- Reference image URLs for consistent subject appearance. Up to 9 images. items: type: string format: uri maxItems: 9 default: [] reference_video_urls: type: array description: >- Reference video URLs for consistent subject appearance. Up to 3 videos. items: type: string format: uri maxItems: 3 default: [] reference_audio_urls: type: array description: >- Reference audio URLs for consistent subject appearance. Up to 3 audios. items: type: string format: uri maxItems: 3 default: [] securitySchemes: bearerAuth: type: http scheme: bearer description: '`Authorization: Bearer YOUR_API_KEY`' ````