Seedance 2.5 API documentation

Integrate Seedance 2.5 with your VezAPI key. The operations below share the same authentication and account balance.

Base URL: https://api.vezapi.com
Send Authorization: Bearer YOUR_VEZAPI_KEY. Use a unique Idempotency-Key for each submission; reuse it only when checking the same request.

Bytedance Seedance 2.5 Draft

POST/api/v1/jobs/createTask

Model IDs: bytedance/seedance-2-5-draft

Parameter	Type	Description & constraints
`model` required	`string`	The model name to use for generation. Required field. - Must be `bytedance/seedance-2-5-draft` for this endpoint Values: `"bytedance/seedance-2-5-draft"` Default: `"bytedance/seedance-2-5-draft"`
`callBackUrl` optional	`string`	The URL to receive generation task completion updates. Optional but recommended for production use. - System will POST task status and results to this URL when generation completes - Callback includes generated content URLs and task information - Your callback endpoint should accept POST requests with JSON payload containing results - Alternatively, use the Get Task Details endpoint to poll task status - To ensure callback security, see [Webhook Verification Guide](/common-api/webhook-verification) for signature verification implementation
`input` required	`object`	Input parameters for the generation task
`input.draft_task_id` required	`string`	task id from model seedance 2.5 generation task. Valid for 7 days from draft creation.
`input.resolution` required	`string`	output video resolution. Values: `"1080p"`
`input.output_format` optional	`string`	ouput video format. Values: `"mp4", "mov"`
`input.return_last_frame` optional	`boolean`	Whether to also return the last frame of the generated video as a JPEG (in resultJson.lastFrameUrl). Default false. Default: `false`
`input.nsfw_checker` optional	`boolean`	Defaults to false. When false, no additional content filtering is applied and results are returned directly by the model.

Request example

curl -X POST 'https://api.vezapi.com/api/v1/jobs/createTask' \
  -H 'Authorization: Bearer YOUR_VEZAPI_KEY' \
  -H 'Idempotency-Key: your-unique-request-id' \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "bytedance/seedance-2-5-draft",
  "input": {
    "draft_task_id": "Your prompt",
    "resolution": "1080p"
  }
}'

Responses and errors

HTTP 200

Request successful

Parameter	Type	Description & constraints
`code` optional	`integer`	Status code of the request. The HTTP status is 200 even when the request fails, so always check this field: 200 means success; any other value means the request failed and msg describes the reason. Common values: 401 invalid or missing API key; 402 insufficient credits; 429 rate limit exceeded; 422 or 500 the request could not be processed (read msg and check your parameters before retrying). Values: `200, 401, 402, 404, 422, 429, 433, 455, 500, 501, 505`
`msg` optional	`string`	Response message, error description upon failure
`data` required	`object`
`data.taskId` required	`string`	The task ID can be used with the "Get Task Details" endpoint to query the task status.

Bytedance Seedance 2.5

POST/api/v1/jobs/createTask

Model IDs: bytedance/seedance-2-5

Parameter	Type	Description & constraints
`model` required	`string`	The model name to use for generation. Required field. - Must be `bytedance/seedance-2-5` for this endpoint Values: `"bytedance/seedance-2-5"` Default: `"bytedance/seedance-2-5"`
`callBackUrl` optional	`string`	The URL to receive generation task completion updates. Optional but recommended for production use. - System will POST task status and results to this URL when generation completes - Callback includes generated content URLs and task information - Your callback endpoint should accept POST requests with JSON payload containing results - Alternatively, use the Get Task Details endpoint to poll task status - To ensure callback security, see [Webhook Verification Guide](/common-api/webhook-verification) for signature verification implementation
`input` required	`object`	Input parameters for the generation task
`input.prompt` optional	`string`	The text prompt used to generate the video.. ( Max length: 20480 characters) `maxLength: 20480`
`input.first_frame_url` optional	`string`	First frame image url or asset://{assetId} (for example: asset://asset-20260404242101-76djj) Cannot be used simultaneously with reference_image_urls, reference_video_urls, or reference_audio_urls.
`input.last_frame_url` optional	`string`	End frame image url or asset://{assetId} (for example: asset://asset-20260404242101-76djj) last_frame_url cannot be passed alone; first_frame_url must be provided together with it.
`input.reference_image_urls` optional	`array`	Enter a list of image URLs or asset://{assetId} (for example: asset://asset-20260404242101-76djj). Single image requirements: Format: jpeg, png, webp. Aspect ratio (width/height): (0.4, 2.5) Width and height (px): (300, 6000) Size: Single image less than 30 MB. Up to 30 images. Mutually exclusive with the first/last-frame scenario; `maxItems: 30`
`input.reference_video_urls` optional	`array`	Enter a list of video URLs or asset://{assetId} (for example: asset://asset-20260404242101-76djj) . Single video requirements: Video format: mp4, mov, mkv. Resolution: 480p, 720p Dimensions: Aspect ratio (width/height): [0.4, 2.5] Width/height (px): [300, 6000] Total pixels: [640×640=409600, 834×1112=927408], i.e., the product of width and height must meet the range requirement of [409600, 927408]. Size: Single video not exceeding 200 MB. Frame rate (FPS): [24, 60] Single video duration: [2, 30] seconds; Mutually exclusive with the first/last-frame scenario; Total duration of reference videos must not exceed 30 seconds. `maxItems: 10`
`input.reference_audio_urls` optional	`array`	Enter a list of audio URLs or asset://{assetId} (for example: asset://asset-20260404242101-76djj) . Single audio requirements: Format: wav, mp3, aac, ogg Size: Single audio file size not exceeding 15 MB. Single audio duration: [2, 30] seconds; mutually exclusive with first/last frames; total duration of reference audio must not exceed 30 seconds. `maxItems: 10`
`input.return_last_frame` optional	`boolean`	Whether to also return the last frame of the generated video as a JPEG (in resultJson.lastFrameUrl). Default false. Default: `false`
`input.generate_audio` optional	`boolean`	Whether to generate audio synchronized with the video. Default: true. Default: `true`
`input.resolution` optional	`string`	Video resolution - 480p for faster generation, 720p for balance. Values: `"480p", "720p", "1080p"` Default: `"720p"`
`input.aspect_ratio` optional	`string`	Video aspect ratio configuration. Values: `"1:1", "4:3", "3:4", "16:9", "9:16", "21:9", "adaptive"` Default: `"adaptive"`
`input.duration` optional	`integer`	Video duration in 4-30 seconds. Special values -1: Pass -1 for automatic duration selection — the model picks a suitable duration itself (for video-editing tasks, it matches the input video's length; for other task types, it selects within the valid range), instead of you specifying an exact value. Default: `5`
`input.output_format` optional	`string`	Video output format. Values: `"mp4", "mov"` Default: `"mp4"`
`input.web_search` optional	`boolean`	Enable online search.
`input.draft` optional	`boolean`	Enable draft mode. When enabled, only 480p resolution is allowed. Draft task ID is valid for 7 days from draft creation. Default: `false`
`input.nsfw_checker` optional	`boolean`	Defaults to false. When false, no additional content filtering is applied and results are returned directly by the model.

Request example

curl -X POST 'https://api.vezapi.com/api/v1/jobs/createTask' \
  -H 'Authorization: Bearer YOUR_VEZAPI_KEY' \
  -H 'Idempotency-Key: your-unique-request-id' \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "bytedance/seedance-2-5",
  "input": {
    "prompt": "A serene beach at sunset with waves gently crashing on the shore, palm trees swaying in the breeze, and seagulls flying across the orange sky",
    "resolution": "720p",
    "aspect_ratio": "adaptive",
    "duration": 5
  }
}'

Responses and errors

HTTP 200

Request successful

Parameter	Type	Description & constraints
`code` optional	`integer`	Status code of the request. The HTTP status is 200 even when the request fails, so always check this field: 200 means success; any other value means the request failed and msg describes the reason. Common values: 401 invalid or missing API key; 402 insufficient credits; 429 rate limit exceeded; 422 or 500 the request could not be processed (read msg and check your parameters before retrying). Values: `200, 401, 402, 404, 422, 429, 433, 455, 500, 501, 505`
`msg` optional	`string`	Response message, error description upon failure
`data` required	`object`
`data.taskId` required	`string`	The task ID can be used with the "Get Task Details" endpoint to query the task status.

Task status and callbacks

For asynchronous tasks, keep the returned taskId. Query GET /api/v1/jobs/recordInfo?taskId=... or provide callBackUrl when creating the task. Only the account that created a task can access it or derive new resources from it.

A timeout can mean the submission was accepted. Inspect the existing request in your dashboard; do not create another task automatically. Callback delivery is retried and may arrive more than once. Deduplicate with X-VezAPI-Event-Id.

Files, logs and billing

Generated media normally follows a 14-day provider lifetime; uploaded files expire after 24 hours. Save the files you need before expiration. VezAPI streams registered files without keeping a permanent media library. Request logs are retained for two calendar months.

Credits are reserved before submission. Final deductions match actual discounted consumption one for one. Unknown usage pauses new paid requests. If available funds cannot cover final usage while protecting other reservations, settlement stays pending until funded; model usage cannot make the wallet negative. Time-based inputs require server-side metadata reads; a failed read prevents submission.