API reference · Alibaba

alibaba/wan/2.1/vace/outpainting

Integrate this model through SandBase's unified API, with production-ready schemas and examples.

VIDEOAsyncOpen model

Production endpoint

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OpenAI-compatible endpoint with unified authentication and usage tracking.

POSThttps://api.sandbase.ai/v1/run

Model IDalibaba/wan/2.1/vace/outpainting

Input Schema

10 parameters · 1 required · 9 optional

Parameter	Type	Required	Description
`prompt`	string	Required	The text prompt to guide video generation.
`seed`	integer	Optional	Random seed for reproducibility. If None, a random seed is chosen.
`video`	string	Optional	URL to the source video file. Required for outpainting.
`expand_top`	boolean	Optional	Whether to expand the video to the top. · Default: false
`resolution`	string	Optional	Resolution of the generated video. · Options: auto, 240p, 360p, 480p, 720p · Default: "auto" auto240p360p480p720p
`expand_left`	boolean	Optional	Whether to expand the video to the left. · Default: false
`aspect_ratio`	string	Optional	The aspect ratio of the generated image. · Options: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16 21:916:93:24:35:41:14:53:42:39:16
`expand_ratio`	number	Optional	Amount of expansion. This is a float value between 0 and 1, where 0.25 adds 25% to the original video size on the specified sides. · Min: 0 · Max: 1 · Default: 0.25
`expand_right`	boolean	Optional	Whether to expand the video to the right. · Default: false
`expand_bottom`	boolean	Optional	Whether to expand the video to the bottom. · Default: false

Output Schema

Field	Type	Description
`id`	string	Unique identifier for the generation task
`status`	string	Task status: pending, running, completed, failed, timeout
`model`	string	Model used for the generation
`outputs`	array	Array of output items
`outputs[].url`	string	URL of the generated artifact
`outputs[].content_type`	string	MIME type (e.g. image/png, video/mp4)
`error`	object \| null	Error details if failed, null on success
`error.type`	string	Machine-readable error type code
`error.message`	string	Human-readable error description

Async Workflow

This model uses asynchronous execution. Submit a request and poll for the result.

Submit — POST to /v1/run, receive an id
Poll — GET /v1/run/{id} until status is completed, failed, or timeout
Retrieve — Read outputs from the completed response

Code Examples

Ready-to-run snippets

# Step 1: Submit
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
  "model": "alibaba/wan/2.1/vace/outpainting",
  "video": "https://static.sandbase.ai/examples/alibaba/wan/2.1/vace/outpainting/input_video_0.mp4",
  "prompt": "A lone woman strides through the neon-drenched streets of Tokyo at night.  Her crimson dress, a vibrant splash of color against the deep blues and blacks of the cityscape, flows slightly with each step. A tailored black jacket, crisp and elegant, contrasts sharply with the dress's rich texture. Medium shot:  The city hums around her, blurred lights creating streaks of color in the background. Close-up:  The fabric of her dress catches the streetlight's glow, revealing a subtle silk sheen and the intricate stitching at the hem. Her black jacket’s subtle texture is visible – a fine wool perhaps, with a matte finish. The overall mood is one of quiet confidence and mystery, a vibrant woman navigating a bustling, nocturnal landscape. High resolution 4k.",
  "expand_top": true,
  "resolution": "auto",
  "expand_left": true,
  "expand_ratio": 0.25,
  "expand_right": true,
  "expand_bottom": true
}'

# Step 2: Poll result (replace <id>)
curl https://api.sandbase.ai/v1/run/<id> \
  -H "Authorization: Bearer YOUR_API_KEY"

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