> ## Documentation Index
> Fetch the complete documentation index at: https://docs.evolink.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Seedance 2.0 Text-to-Video

> - Generate videos from text prompts, supports web search for enhanced timeliness
- **Now supports AIGC realistic human materials**
- Asynchronous processing mode, use the returned task ID to [query status](/en/api-manual/task-management/get-task-detail)
- Generated video links are valid for 24 hours, please save them promptly



## OpenAPI

````yaml /en/api-manual/video-series/seedance2.0/seedance-2.0-text-to-video.json POST /v1/videos/generations
openapi: 3.1.0
info:
  title: Seedance 2.0 Text-to-Video API
  description: >-
    Seedance 2.0 text-to-video API, supports generating videos from text prompts
    with web search for enhanced timeliness
  license:
    name: MIT
  version: 1.0.0
servers:
  - url: https://api.evolink.ai
    description: Production
security:
  - bearerAuth: []
tags:
  - name: Video Generation
    description: AI video generation endpoints
paths:
  /v1/videos/generations:
    post:
      tags:
        - Video Generation
      summary: Seedance 2.0 Text-to-Video
      description: >-
        - Generate videos from text prompts, supports web search for enhanced
        timeliness

        - **Now supports AIGC realistic human materials**

        - Asynchronous processing mode, use the returned task ID to [query
        status](/en/api-manual/task-management/get-task-detail)

        - Generated video links are valid for 24 hours, please save them
        promptly
      operationId: createSeedance20TextToVideo
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VideoGenerationRequest'
            examples:
              basic:
                summary: Basic text-to-video
                value:
                  model: seedance-2.0-text-to-video
                  prompt: >-
                    A macro lens focuses on a green glass frog on a leaf. The
                    focus gradually shifts from its smooth skin to its
                    completely transparent abdomen, where a bright red heart is
                    beating powerfully and rhythmically.
                  duration: 8
                  quality: 720p
                  aspect_ratio: '16:9'
                  generate_audio: true
              web_search:
                summary: Text-to-video with web search
                value:
                  model: seedance-2.0-text-to-video
                  prompt: >-
                    Today's New York weather forecast, with city skyline
                    animation and temperature overlay display
                  duration: 8
                  aspect_ratio: '16:9'
                  model_params:
                    web_search: true
      responses:
        '200':
          description: Video generation task created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VideoGenerationResponse'
        '400':
          description: Invalid request parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: invalid_request
                  message: Invalid request parameters
                  type: invalid_request_error
        '401':
          description: Unauthenticated, token invalid or expired
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: unauthorized
                  message: Invalid or expired token
                  type: authentication_error
        '402':
          description: Insufficient quota, top-up required
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: insufficient_quota
                  message: Insufficient quota. Please top up your account.
                  type: insufficient_quota
        '403':
          description: Access denied
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: model_access_denied
                  message: >-
                    Token does not have access to model:
                    seedance-2.0-text-to-video
                  type: invalid_request_error
        '429':
          description: Rate limit exceeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: rate_limit_exceeded
                  message: Too many requests, please try again later
                  type: rate_limit_error
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: internal_error
                  message: Internal server error
                  type: api_error
components:
  schemas:
    VideoGenerationRequest:
      type: object
      required:
        - model
        - prompt
      properties:
        model:
          type: string
          description: Video generation model name
          enum:
            - seedance-2.0-text-to-video
          default: seedance-2.0-text-to-video
          example: seedance-2.0-text-to-video
        prompt:
          type: string
          description: >-
            Text prompt describing the desired video. Supports both Chinese and
            English, recommended no more than 500 characters for Chinese or 1000
            words for English


            **Note:**

            - This model is text-to-video only and does not support
            `image_urls`, `video_urls`, or `audio_urls` input
          example: >-
            A macro lens focuses on a green glass frog on a leaf. The focus
            gradually shifts from its smooth skin to its completely transparent
            abdomen, where a bright red heart is beating powerfully and
            rhythmically.
        duration:
          type: integer
          description: |-
            Video duration (seconds), defaults to `5` seconds

            **Details:**
            - Supports any integer value between `4`–`15` seconds
            - Duration directly affects billing
          default: 5
          minimum: 4
          maximum: 15
          example: 8
        quality:
          type: string
          description: |-
            Video resolution, defaults to `720p`

            **Options:**
            - `480p`: Lower clarity, lower cost
            - `720p`: Standard clarity, this is the default
            - `1080p`: Ultra HD clarity
          enum:
            - 480p
            - 720p
            - 1080p
          default: 720p
          example: 720p
        aspect_ratio:
          type: string
          description: >-
            Video aspect ratio, defaults to `16:9`


            **Options:**

            - `16:9` (landscape), `9:16` (portrait), `1:1` (square), `4:3`,
            `3:4`, `21:9` (ultrawide)

            - `adaptive`: The model intelligently selects the best aspect ratio
            based on the prompt


            **Pixel values per resolution:**


            | Aspect Ratio | 480p | 720p |

            |:------:|:----:|:----:|

            | 16:9 | 864×496 | 1280×720 |

            | 4:3 | 752×560 | 1112×834 |

            | 1:1 | 640×640 | 960×960 |

            | 3:4 | 560×752 | 834×1112 |

            | 9:16 | 496×864 | 720×1280 |

            | 21:9 | 992×432 | 1470×630 |
          enum:
            - '16:9'
            - '9:16'
            - '1:1'
            - '4:3'
            - '3:4'
            - '21:9'
            - adaptive
          default: '16:9'
          example: '16:9'
        generate_audio:
          type: boolean
          description: >-
            Whether to generate synchronized audio, defaults to `true`


            **Options:**

            - `true`: Video includes synchronized audio (voice, sound effects,
            background music) at no additional charge. It is recommended to
            place dialogue within double quotes to optimize audio generation

            - `false`: Output silent video
          default: true
          example: true
        model_params:
          type: object
          description: Model extension parameters
          properties:
            web_search:
              type: boolean
              description: >-
                Web search, defaults to `false`


                **Details:**

                - When enabled, the model autonomously decides whether to search
                internet content (e.g., products, weather) based on the prompt,
                improving timeliness

                - May increase latency

                - Fees are only charged when searches are actually triggered;
                multiple searches may occur once enabled
              default: false
              example: false
        callback_url:
          type: string
          description: >-
            HTTPS callback URL for task completion


            **Callback timing:**

            - Triggered when the task is completed, failed, or cancelled

            - Sent after billing confirmation is complete


            **Security restrictions:**

            - Only HTTPS protocol is supported

            - Callbacks to private IP addresses are prohibited (127.0.0.1,
            10.x.x.x, 172.16-31.x.x, 192.168.x.x, etc.)

            - URL length must not exceed `2048` characters


            **Callback mechanism:**

            - Timeout: `10` seconds

            - Up to `3` retries after failure (at `1`/`2`/`4` seconds after
            failure respectively)

            - Callback response body format is consistent with the task query
            endpoint response format

            - A 2xx status code is considered successful; other status codes
            trigger retries
          format: uri
          example: https://your-domain.com/webhooks/video-task-completed
    VideoGenerationResponse:
      type: object
      properties:
        created:
          type: integer
          description: Task creation timestamp
          example: 1761313744
        id:
          type: string
          description: Task ID
          example: task-unified-1774857405-abc123
        model:
          type: string
          description: Actual model name used
          example: seedance-2.0-text-to-video
        object:
          type: string
          enum:
            - video.generation.task
          description: Specific type of the task
        progress:
          type: integer
          description: Task progress percentage (0-100)
          minimum: 0
          maximum: 100
          example: 0
        status:
          type: string
          description: Task status
          enum:
            - pending
            - processing
            - completed
            - failed
          example: pending
        task_info:
          $ref: '#/components/schemas/VideoTaskInfo'
          description: Video task details
        type:
          type: string
          enum:
            - text
            - image
            - audio
            - video
          description: Output type of the task
          example: video
        usage:
          $ref: '#/components/schemas/VideoUsage'
          description: Usage and billing information
    ErrorResponse:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
              description: Error code identifier
            message:
              type: string
              description: Error description message
            type:
              type: string
              description: Error type
    VideoTaskInfo:
      type: object
      properties:
        can_cancel:
          type: boolean
          description: Whether the task can be cancelled
          example: true
        estimated_time:
          type: integer
          description: Estimated completion time (seconds)
          minimum: 0
          example: 165
        video_duration:
          type: integer
          description: Video duration (seconds)
          example: 8
    VideoUsage:
      type: object
      description: Usage and billing information
      properties:
        billing_rule:
          type: string
          description: Billing rule
          enum:
            - per_call
            - per_token
            - per_second
          example: per_second
        credits_reserved:
          type: number
          description: Estimated credits consumed
          minimum: 0
          example: 50
        user_group:
          type: string
          description: User group category
          example: default
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        ##All endpoints require Bearer Token authentication##


        **Get API Key:**


        Visit the [API Key Management Page](https://evolink.ai/dashboard/keys)
        to obtain your API Key


        **Add to request header:**

        ```

        Authorization: Bearer YOUR_API_KEY

        ```

````




> ## Documentation Index
> Fetch the complete documentation index at: https://docs.evolink.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Query Task Status

> Query the status, progress, and result information of asynchronous tasks by task ID



## OpenAPI

````yaml en/api-manual/task-management/get-task-detail.json get /v1/tasks/{task_id}
openapi: 3.1.0
info:
  title: Get Task Details API
  description: >-
    Query the status, progress, and result information of asynchronous tasks by
    task ID
  license:
    name: MIT
  version: 1.0.0
servers:
  - url: https://api.evolink.ai
    description: Production environment
security:
  - bearerAuth: []
tags:
  - name: Task Management
    description: Asynchronous task management related APIs
paths:
  /v1/tasks/{task_id}:
    get:
      tags:
        - Task Management
      summary: Query Task Status
      description: >-
        Query the status, progress, and result information of asynchronous tasks
        by task ID
      operationId: getTaskDetail
      parameters:
        - name: task_id
          in: path
          required: true
          schema:
            type: string
          description: >-
            Task ID, ignore {} when querying, append the id from the async task
            response body at the end of the path
          example: task-unified-1756817821-4x3rx6ny
      responses:
        '200':
          description: Task status details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TaskDetailResponse'
        '400':
          description: Request parameter error, format error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: invalid_task_id
                  message: Invalid task ID format, must start with 'task-unified-'
                  type: invalid_request_error
                  param: task_id
        '401':
          description: Unauthenticated, token invalid or expired
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: unauthorized
                  message: Authentication required
                  type: authentication_error
        '402':
          description: Insufficient quota, recharge required
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: quota_exceeded
                  message: Insufficient quota. Please top up your account.
                  type: insufficient_quota
        '403':
          description: No permission to access
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: permission_denied
                  message: You don't have permission to access this task
                  type: invalid_request_error
        '404':
          description: Resource does not exist
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: task_not_found
                  message: The requested task could not be found
                  type: invalid_request_error
        '429':
          description: Request rate limit exceeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: rate_limit_exceeded
                  message: Rate limit exceeded
                  type: evo_api_error
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                error:
                  code: internal_error
                  message: Failed to retrieve task status
                  type: api_error
components:
  schemas:
    TaskDetailResponse:
      type: object
      properties:
        created:
          type: integer
          description: Task creation timestamp
          example: 1756817821
        id:
          type: string
          description: Task ID
          example: task-unified-1756817821-4x3rx6ny
        model:
          type: string
          description: Model used
          example: gemini-3.1-flash-image-preview
        object:
          type: string
          description: Task type
          enum:
            - image.generation.task
            - video.generation.task
            - audio.generation.task
          example: image.generation.task
        progress:
          type: integer
          minimum: 0
          maximum: 100
          description: Task progress percentage
          example: 100
        results:
          type: array
          items:
            type: string
            format: uri
          description: Task result list (provided when completed)
          example:
            - http://example.com/image.jpg
        status:
          type: string
          description: Task status
          enum:
            - pending
            - processing
            - completed
            - failed
          example: completed
        error:
          type: object
          nullable: true
          description: >-
            Error information when the task fails (only present when status is
            "failed"). Note: error.code here is a string-type business error
            code, different from HTTP status codes. See the Error Codes
            Reference for the complete list.
          properties:
            code:
              type: string
              description: Business error code (string type)
              example: content_policy_violation
            message:
              type: string
              description: User-friendly error description with troubleshooting tips
              example: |-
                Content policy violation.
                Your request was blocked by safety filters.
            type:
              type: string
              description: Error type identifier, always "task_error"
              example: task_error
        task_info:
          type: object
          description: Task detailed information
          properties:
            can_cancel:
              type: boolean
              description: Whether the task can be cancelled
              example: false
        type:
          type: string
          description: Task type
          enum:
            - image
            - video
            - audio
            - text
          example: image
    ErrorResponse:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
              description: Error code (string type)
              example: invalid_task_id
            message:
              type: string
              description: Error description message
              example: Invalid task ID format
            type:
              type: string
              description: Error type
              example: invalid_request_error
            param:
              type: string
              description: Related parameter name
              example: task_id
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        ##All APIs require Bearer Token authentication##


        **Get API Key:**


        Visit [API Key Management Page](https://evolink.ai/dashboard/keys) to
        get your API Key


        **Add to request header:**

        ```

        Authorization: Bearer YOUR_API_KEY

        ```

````