API reference · Alibaba

alibaba/wan/3.0/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/3.0/video-extend

Input Schema

8 parameters · 2 required · 6 optional

Parameter	Type	Required	Description
`video`	string	Required	URL of the input video (MP4 or MOV; 1-15 seconds, at least 16 fps, 240-4096px per side, under 100MB).
`prompt`	string	Required	Text instruction describing the extension. Refer to the input video as Video 1 and to reference images or audio as Image 1, Audio 1, and so on. · Min length: 1 · Max length: 5000
`seed`	integer	Optional	Random seed (0-2147483647) for reproducible results. Omit for a random seed; the same seed may still produce slightly different results. · Min: 0 · Max: 2147483647
`audios`	string[]	Optional	Up to 5 optional reference audio URLs (WAV or MP3; 1-15s each, 15s total, under 15MB each).
`images`	string[]	Optional	Up to 10 optional reference image URLs (JPEG, PNG, BMP, or WebP; up to 20MB each). Refer to them in the prompt as Image 1, Image 2, and so on.
`duration`	any	Optional	Duration of the extension in seconds (2-30), or `auto` to let the model choose. The input video length plus this duration must not exceed 30 seconds. `auto` is pre-authorized at 30 seconds and billed on the actual output length. · Options: auto, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 · Default: 5 auto23456789101112131415161718192021222324252627282930
`resolution`	string	Optional	Output video resolution tier. · Options: 480p, 720p, 1080p · Default: "720p" 480p720p1080p
`generate_audio`	boolean	Optional	Generate a synchronized audio track. Pricing is the same either way. · Default: true

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/3.0/video-extend",
    "video": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260402/ldnfdf/wan2.7-videoedit-style-change.mp4",
    "duration": 5,
    "resolution": "720p",
    "generate_audio": true
  }),
});

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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