ShengshuTutorial
ShengshuHow to Use Vidu Q3 Pro API
A step-by-step Vidu Q3 Pro API tutorial with Node.js, Python and cURL: submit a text to video job, poll it or receive a webhook, and download the video. The example below costs $0.38.
- Endpoints
- 2
- Text to Video · Image to Video
- Example request
- $0.38
- Text to Video
- Languages
- 3
- Node.js · Python · cURL
- Failed runs
- $0
- refunded automatically
Get an API key
Create an account, add credits and create a key in Dashboard → API keys. Store it as CHEAPERGEN_API_KEY on your server. Every request sends it as a bearer token.
Choose a Vidu Q3 Pro endpoint
Each task has its own endpoint. All of them take a JSON body and return a generation you can poll.
| Task | Endpoint | Required | From |
|---|---|---|---|
| Text to Video | shengshu/vidu-q3-pro/text-to-video | prompt | $0.0337/s |
| Image to Video | shengshu/vidu-q3-pro/image-to-video | prompt, image_url | $0.0337/s |
Submit a text to video job
This program submits the job, polls every 3 seconds until it finishes and prints the video URL. Swap the prompt and settings for your own.
const API = "https://cheapergen.com/api/v1";
const headers = {
Authorization: `Bearer ${process.env.CHEAPERGEN_API_KEY}`,
"Content-Type": "application/json",
};
// 1. Submit the job
let job = await fetch(`${API}/run/shengshu/vidu-q3-pro/text-to-video`, {
method: "POST",
headers,
body: JSON.stringify({
"prompt": "A lighthouse keeper climbs the spiral stairs during a storm, lightning through the windows, the beam sweeping the waves; cut to the lamp room as she lights it",
"aspect_ratio": "16:9",
"resolution": "720p",
"duration": 5
}),
}).then((r) => r.json());
// 2. Poll until it finishes (or pass webhook_url and skip polling)
while (job.status === "queued" || job.status === "running") {
await new Promise((r) => setTimeout(r, 3000));
job = await fetch(`${API}/generations/${job.id}`, { headers }).then((r) => r.json());
}
console.log(job.status === "succeeded" ? job.output.video.url : job.error);Set the parameters that matter
The settings for shengshu/vidu-q3-pro/text-to-video, with what each one does to the price.
| Parameter | Type · default | What it does | Price effect |
|---|---|---|---|
| aspect_ratio | string (enum) · 16:9 | Output frame shape. 16:9 · 9:16 · 1:1 · 4:3 · 3:4 | Yes |
| resolution | string (enum) · 720p | Output resolution. Higher resolutions cost more per second. 540p · 720p · 1080p | 540p: $0.0337/s 720p: $0.0748/s 1080p: $0.0897/s |
| duration | integer · 5 | Length of the generated clip in seconds (1–16s). You pay per second. | Billed per second |
| generate_audio | boolean · true | Generate synchronized dialogue and sound effects. Included in the price. | None |
| seed | integer | Use the same seed and settings to reproduce a result. Leave empty for random. | None |
Other Vidu Q3 Pro endpoints take the same shape with their own inputs:
POST /api/v1/run/shengshu/vidu-q3-pro/image-to-video
{
"prompt": "The dancer spins once and freezes in a pose as the stage lights flare; slow push-in, applause rises",
"image_url": "https://cdn.cheapergen.com/samples/portrait.jpg",
"resolution": "720p",
"duration": 5
}Get the result
A job moves from queued to running to succeeded, failed or canceled. Poll GET /api/v1/generations/{id}, or pass webhook_url and we POST the result to you. Download the output and store it yourself.
200 — succeeded
{
"id": "gen_8c2QmX1nq0k4",
"object": "generation",
"model": "shengshu/vidu-q3-pro",
"endpoint": "shengshu/vidu-q3-pro/text-to-video",
"mode": "text-to-video",
"status": "succeeded",
"input": {
"prompt": "A lighthouse keeper climbs the spiral stairs during a storm, lightning through the windows, the beam sweeping the waves; cut to the lamp room as she lights it",
"aspect_ratio": "16:9",
"resolution": "720p",
"duration": 5
},
"output": {
"video": {
"url": "https://cdn.cheapergen.com/outputs/gen_8c2Q.mp4",
"content_type": "video/mp4",
"duration": 5,
"width": 1280,
"height": 720
}
},
"error": null,
"cost": {
"amount_usd": 0.2255,
"currency": "usd",
"estimated": false,
"official_usd": 0.264,
"list_price_source": "official",
"list_price_label": "Official",
"saved_usd": 0.0385
},
"source": "api",
"created_at": "2026-10-15T09:21:04Z",
"started_at": "2026-10-15T09:21:06Z",
"completed_at": "2026-10-15T09:22:31Z"
}Price a request before you run it
The quote endpoint is free and needs no key. It returns the price, the official price and your discount for exactly the input you send.
curl -X POST https://cheapergen.com/api/v1/quote/shengshu/vidu-q3-pro/text-to-video \
-H "Content-Type: application/json" \
-d '{"prompt":"A lighthouse keeper climbs the spiral stairs during a storm, lightning through the windows, the beam sweeping the waves; cut to the lamp room as she lights it","aspect_ratio":"16:9","resolution":"720p","duration":5}'| Status | Code | Meaning |
|---|---|---|
| 400 | invalid_request | A parameter is missing or out of range — the message names it. |
| 401 | unauthorized | Missing, malformed or revoked API key. |
| 402 | insufficient_balance | Not enough credits for the quoted price; top up or enable auto top-up. |
| 429 | rate_limited | Too many requests or generations in progress; back off and retry. |
| 502 | upstream_error | The model provider failed; the hold is refunded and you can retry. |
| 503 | model_unavailable | No healthy route right now; retry later or pick another model. |
FAQ
Vidu Q3 Pro API questions
No. The API is plain HTTPS with JSON, so the Node.js (fetch) and Python (requests) examples on this page are complete programs. Any language that can send an HTTP request works.
Yes. Add "webhook_url" to the request body and we POST the finished generation to it, signed with a CheaperGen-Signature header (HMAC-SHA256 of the timestamp and raw body). Polling GET /api/v1/generations/{id} works too.
Pass public URLs in "image_url", "end_image_url". Files without a public URL can be uploaded first with POST /api/v1/uploads, which returns a URL to use in the request.
Text to Video starts at $0.0337/s; the example request on this page costs $0.38, 25% below the official price. Failed generations are refunded automatically.