API reference · Alibaba

alibaba/wan/2.7/video-extend

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/2.7/video-extend

Input Schema

6 parameters · 2 required · 4 optional

Parameter	Type	Required	Description
`video`	string	Required	URL of the source clip to continue (MP4 or MOV, 2-10 seconds, 240-4096px per side, up to 100MB).
`prompt`	string	Required	What happens after the source clip ends: action, camera movement, scene progression, and sound. Up to 5,000 characters. · Min length: 3 · Max length: 5000
`seed`	integer	Optional	Random seed (0-2147483647) for reproducible results. Omit for a random seed. · Min: 0 · Max: 2147483647
`duration`	integer	Optional	Total length of the output in seconds, including the source clip (2-15). For a 3-second source and duration 10, the model adds 7 seconds. Must be longer than the source clip. · Options: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 · Default: 5 23456789101112131415
`end_image`	string	Optional	Optional last frame the continuation should end on (JPEG, PNG, BMP, or WebP; 240-8000px per side, up to 20MB).
`resolution`	string	Optional	The resolution of the video to generate. · Options: 720p, 1080p · Default: "720p" 720p1080p

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

const apiKey = process.env.SANDBASE_API_KEY;
const response = await fetch("https://api.sandbase.ai/v1/run", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${apiKey}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "alibaba/wan/2.7/video-extend",
    "video": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260129/hfugmr/wan-r2v-role1.mp4",
    "prompt": "A girl takes a selfie in the mirror, then picks up her backpack and walks out of the room.",
    "duration": 5,
    "resolution": "720p"
  }),
});

if (!response.ok) throw new Error(await response.text());
let result = await response.json();
for (let attempt = 0; attempt < 120 && !["completed", "failed", "timeout"].includes(result.status); attempt++) {
  await new Promise((resolve) => setTimeout(resolve, 2_000));
  const poll = await fetch(`https://api.sandbase.ai/v1/run/${result.id}`, {
    headers: { Authorization: `Bearer ${apiKey}` },
  });
  if (!poll.ok) throw new Error(await poll.text());
  result = await poll.json();
}
if (result.status !== "completed") throw new Error(`Generation ended: ${result.status}`);
console.log(result);

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