Name: Kling 3.0 Motion Control API | Motion Transfer | api.market
Brand: magicapi
SKU: api-magicapi-motion-transfer-api-kwaivgi-kling-v3-motion-control
Availability: InStock
Author: API Market

Shashank Agarwal

# 🎥 Motion Transfer API (Kling 3.0 Motion Control)

## Overview
Kling 3.0 Motion Control is a model from Kuaishou that transfers motion from a reference video to a character image. You send a reference image (the character, background and other elements) and a reference video (the actions to copy). The model returns a video in which the character from your image performs the actions from your video. An optional prompt can add elements to the scene and motion effects.

## Features
- **Motion transfer:** the character actions in the output follow the reference video.
- **Reference image:** .jpg, .jpeg or .png, up to 10MB, dimensions 340px to 3850px, aspect ratio from 1:2.5 to 2.5:1.
- **Reference video:** .mp4 or .mov, up to 100MB, 3 to 30 seconds depending on `character_orientation`.
- **Character orientation:** `image` keeps the orientation of the person in the picture (video up to 10 seconds); `video` follows the orientation of the characters in the video (video up to 30 seconds).
- **Two modes:** `std` (720p) and `pro` (1080p, the default).
- **Original sound:** keep or drop the reference video's audio with `keep_original_sound` (default true).

## Use Cases
- **Dance and trend videos:** put a character or mascot into a dance or gesture clip.
- **Character animation:** animate an illustrated or rendered character from a filmed performance.
- **Marketing content:** make a brand mascot repeat a recorded action for ads and social posts.
- **Previsualization:** test how a character would move in a scene before full production.

## Visual Examples
This is a real request sent through api.market and the file it returned.

Prompt used: "The astronaut walks forward on a wet city street at night"

Other inputs: `mode`: "std" (all other fields at their defaults).

**Input image (`image`):**

![Input reference image of an astronaut character](https://blog.api.market/wp-content/uploads/2026/09/kling-v2-6-motion-control-input-character-api-market.webp)

**Input video (`video`):** [Watch the reference video](https://blog.api.market/wp-content/uploads/2026/10/hailuo-2.3-fast-output-api-market.mp4)

**Output video:** [Watch the example video](https://blog.api.market/wp-content/uploads/2026/10/kling-v3-motion-control-output-api-market.mp4)

## Pricing
- **Pay As You Go (PAYG) pricing:** you only pay for what you use.
- **Price:** $0.088 per API unit.
- **1 API unit** = 1 second of output video, rounded up to the next whole second.
- **mode `std` (720p):** 1 unit per second, so $0.088 per second of output.
- **mode `pro` (1080p):** 1.714 units per second, so about $0.1508 per second of output. The total is rounded up to a whole unit per request.
- **No mode set:** the model default is `pro`, so it bills as `pro` (1.714 units per second).
- **Worked example:** a 5 second output in `std` is 5 units = $0.44. The same 5 second output in `pro` is 5 x 1.714 = 8.57, rounded up to 9 units = $0.792. A 10 second `pro` output is 17.14, rounded up to 18 units = $1.584.
- **Failed or cancelled predictions** are not billed.
- **GET requests** to check prediction status (GET /api/v1/magicapi/motion-transfer-api-kwaivgi-kling-v3-motion-control/predictions/{id}) are free and don't count toward API unit usage.
- **No monthly subscription fee.**

## API Documentation

### Base URL
`https://prod.api.market/api/v1/magicapi/motion-transfer-api-kwaivgi-kling-v3-motion-control`

### Authentication
Send your api.market API key in the `x-api-market-key` header on every request:
```
x-api-market-key: YOUR_API_MARKET_KEY
```

### Asynchronous Processing
**IMPORTANT:** This API is asynchronous.
1. POST `/predictions` with the model `version` and your `input`.
2. The API returns **201 Created** with a prediction `id` and a `status` of `starting` or `processing`. 201 means the request was accepted; it is not an error.
3. Poll GET `/predictions/{id}` until `status` is `succeeded`, `failed` or `canceled`.
4. When `status` is `succeeded`, `output` holds the URL of the generated file.
5. When `status` is `failed`, the `error` field explains why.

### Endpoints

#### Create a Prediction
`POST /predictions`

```bash
curl -X POST "https://prod.api.market/api/v1/magicapi/motion-transfer-api-kwaivgi-kling-v3-motion-control/predictions" \
  -H "Content-Type: application/json" \
  -H "x-api-market-key: YOUR_API_MARKET_KEY" \
  -d '{
    "version": "15430b300f8c044e8f9e3567fd6daadf6d62e9bb0cee23fdb7969d3b26542f40",
    "input": {
      "prompt": "The astronaut walks forward on a wet city street at night",
      "image": "https://blog.api.market/wp-content/uploads/2026/09/kling-v2-6-motion-control-input-character-api-market.webp",
      "video": "https://blog.api.market/wp-content/uploads/2026/10/hailuo-2.3-fast-output-api-market.mp4",
      "mode": "std"
    }
  }'
```

Response (201 Created):
```json
{
  "id": "ufawqhfynnddngldkgtslldrkq",
  "version": "15430b300f8c044e8f9e3567fd6daadf6d62e9bb0cee23fdb7969d3b26542f40",
  "status": "starting",
  "created_at": "2026-10-13T10:22:52.716Z"
}
```

#### Check Prediction Status
`GET /predictions/{id}`

```bash
curl -X GET "https://prod.api.market/api/v1/magicapi/motion-transfer-api-kwaivgi-kling-v3-motion-control/predictions/ufawqhfynnddngldkgtslldrkq" \
  -H "x-api-market-key: YOUR_API_MARKET_KEY"
```

Response (200 OK) once the prediction has finished:
```json
{
  "id": "ufawqhfynnddngldkgtslldrkq",
  "status": "succeeded",
  "input": {
    "prompt": "The astronaut walks forward on a wet city street at night",
    "image": "https://blog.api.market/wp-content/uploads/2026/09/kling-v2-6-motion-control-input-character-api-market.webp",
    "video": "https://blog.api.market/wp-content/uploads/2026/10/hailuo-2.3-fast-output-api-market.mp4",
    "mode": "std"
  },
  "output": "https://blog.api.market/wp-content/uploads/2026/10/kling-v3-motion-control-output-api-market.mp4",
  "error": null,
  "created_at": "2026-10-13T10:22:52.716Z",
  "started_at": "2026-10-13T10:22:53.102Z",
  "completed_at": "2026-10-13T10:23:10.480Z"
}
```

### Input Parameters
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
| `prompt` | string | No | "" (empty) | Text prompt for video generation. You can add elements to the screen and motion effects through the prompt. |
| `image` | string (URL) | Yes | none | URL of the reference image. The characters, backgrounds and other elements in the video are based on it. .jpg/.jpeg/.png, max 10MB, 340px to 3850px, aspect ratio 1:2.5 to 2.5:1. |
| `video` | string (URL) | Yes | none | URL of the reference video. The character actions in the output follow it. .mp4/.mov, max 100MB, 3 to 30 seconds depending on character_orientation. |
| `character_orientation` | string | No | "image" | `image`: same orientation as the person in the picture (max 10 second video). `video`: same orientation as the characters in the video (max 30 second video). |
| `mode` | string | No | "pro" | `std`: standard mode (720p). `pro`: professional mode (1080p). |
| `keep_original_sound` | boolean | No | true | Whether to keep the original sound of the reference video. |

### Output
`output` is a single URL (string) pointing to the generated video.

## Status Codes
- **200 OK:** prediction status returned.
- **201 Created:** prediction accepted. Poll GET `/predictions/{id}` for the result.
- **400 Bad Request:** invalid or missing input fields.
- **401 Unauthorized:** missing or invalid API key.
- **404 Not Found:** unknown prediction ID.
- **429 Too Many Requests:** too many requests in a short time. Wait and retry.
- **500 Internal Server Error:** server-side error. Retry after a short wait.

## Rate Limits

All plans allow 10 requests per second. Requests above that return `429 Too Many Requests`; back off before retrying and honour any `Retry-After` header. Polling a prediction with GET is free but still counts toward the per-second limit, so poll every 1 to 5 seconds rather than in a tight loop.

## Error Handling
- **Request errors (4xx):** check the response body, fix the input fields and send the request again.
- **Failed predictions:** when GET returns `status: "failed"`, read the `error` field. Failed predictions are not billed.
- **Rate limits (429) and server errors (5xx):** retry with exponential backoff.

## Implementation Guide

### JavaScript
```javascript
const apiKey = "YOUR_API_MARKET_KEY";
const baseUrl = "https://prod.api.market/api/v1/magicapi/motion-transfer-api-kwaivgi-kling-v3-motion-control";

async function createPrediction(input) {
  const response = await fetch(`${baseUrl}/predictions`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "x-api-market-key": apiKey
    },
    body: JSON.stringify({
      version: "15430b300f8c044e8f9e3567fd6daadf6d62e9bb0cee23fdb7969d3b26542f40",
      input
    })
  });
  if (response.status !== 201 && response.status !== 200) {
    throw new Error(`API error: ${response.status} ${await response.text()}`);
  }
  return response.json();
}

async function waitForPrediction(id, timeoutMs = 600000, intervalMs = 5000) {
  const start = Date.now();
  while (Date.now() - start < timeoutMs) {
    const response = await fetch(`${baseUrl}/predictions/${id}`, {
      headers: { "x-api-market-key": apiKey }
    });
    if (!response.ok) {
      throw new Error(`API error: ${response.status} ${await response.text()}`);
    }
    const prediction = await response.json();
    if (prediction.status === "succeeded") return prediction.output;
    if (prediction.status === "failed" || prediction.status === "canceled") {
      throw new Error(`Prediction ${prediction.status}: ${prediction.error || "unknown error"}`);
    }
    await new Promise((resolve) => setTimeout(resolve, intervalMs));
  }
  throw new Error("Timed out waiting for the prediction");
}

const prediction = await createPrediction({
  "prompt": "The astronaut walks forward on a wet city street at night",
  "image": "https://blog.api.market/wp-content/uploads/2026/09/kling-v2-6-motion-control-input-character-api-market.webp",
  "video": "https://blog.api.market/wp-content/uploads/2026/10/hailuo-2.3-fast-output-api-market.mp4",
  "mode": "std"
});
const output = await waitForPrediction(prediction.id);
console.log(output);
```

### Python
```python
import time
import requests

API_KEY = "YOUR_API_MARKET_KEY"
BASE_URL = "https://prod.api.market/api/v1/magicapi/motion-transfer-api-kwaivgi-kling-v3-motion-control"

def create_prediction(input_data):
    response = requests.post(
        f"{BASE_URL}/predictions",
        headers={"Content-Type": "application/json", "x-api-market-key": API_KEY},
        json={"version": "15430b300f8c044e8f9e3567fd6daadf6d62e9bb0cee23fdb7969d3b26542f40", "input": input_data},
    )
    if response.status_code not in (200, 201):
        raise Exception(f"API error: {response.status_code} {response.text}")
    return response.json()

def wait_for_prediction(prediction_id, timeout=600, interval=5):
    start = time.time()
    while time.time() - start < timeout:
        response = requests.get(
            f"{BASE_URL}/predictions/{prediction_id}",
            headers={"x-api-market-key": API_KEY},
        )
        if response.status_code != 200:
            raise Exception(f"API error: {response.status_code} {response.text}")
        prediction = response.json()
        if prediction["status"] == "succeeded":
            return prediction["output"]
        if prediction["status"] in ("failed", "canceled"):
            raise Exception(f"Prediction {prediction['status']}: {prediction.get('error') or 'unknown error'}")
        time.sleep(interval)
    raise Exception("Timed out waiting for the prediction")

prediction = create_prediction({
    "prompt": "The astronaut walks forward on a wet city street at night",
    "image": "https://blog.api.market/wp-content/uploads/2026/09/kling-v2-6-motion-control-input-character-api-market.webp",
    "video": "https://blog.api.market/wp-content/uploads/2026/10/hailuo-2.3-fast-output-api-market.mp4",
    "mode": "std"
})
print(wait_for_prediction(prediction["id"]))
```

### cURL
```bash
# Step 1: create the prediction (returns 201 Created with an id)
curl -X POST "https://prod.api.market/api/v1/magicapi/motion-transfer-api-kwaivgi-kling-v3-motion-control/predictions" \
  -H "Content-Type: application/json" \
  -H "x-api-market-key: YOUR_API_MARKET_KEY" \
  -d '{
    "version": "15430b300f8c044e8f9e3567fd6daadf6d62e9bb0cee23fdb7969d3b26542f40",
    "input": {
      "prompt": "The astronaut walks forward on a wet city street at night",
      "image": "https://blog.api.market/wp-content/uploads/2026/09/kling-v2-6-motion-control-input-character-api-market.webp",
      "video": "https://blog.api.market/wp-content/uploads/2026/10/hailuo-2.3-fast-output-api-market.mp4",
      "mode": "std"
    }
  }'

# Step 2: poll with the returned id until status is succeeded, failed or canceled
curl -X GET "https://prod.api.market/api/v1/magicapi/motion-transfer-api-kwaivgi-kling-v3-motion-control/predictions/ufawqhfynnddngldkgtslldrkq" \
  -H "x-api-market-key: YOUR_API_MARKET_KEY"
```

## FAQ
**Q: How long can the reference video be?**  
A: 3 to 30 seconds, depending on `character_orientation`: up to 10 seconds with `image` (the default), up to 30 seconds with `video`. You are billed for the seconds of video the model returns.

**Q: What is the difference between std and pro?**  
A: `std` renders 720p and costs 1 unit per second. `pro` renders 1080p and costs 1.714 units per second. `pro` is the default.

**Q: Can I remove the reference video's audio?**  
A: Yes. Set `keep_original_sound` to false.

**Q: Is POST returning 201 an error?**  
A: No. 201 Created means the prediction was accepted. Use the returned `id` to poll GET `/predictions/{id}` until `status` is `succeeded`, `failed` or `canceled`.

## Contact Us

If you have any questions or need assistance, you can reach out to us through the embedded chat on the bottom right corner of the page or send an email to hello@magicapi.com.


Animate a character image with the motion from a reference video using Kling 3.0 Motion Control. Billed per second of output, from $0.088 per second.