---
title: "Kling 3 Motion Control"
description: "Kling 3 Motion Control transfers the movement of a reference video onto the character in a reference image, and it is best when you own a clip whose motion you want a different person to perform."
url: https://docs.roasos.com/models/video/kling-3-motion
---

# Kling 3 Motion Control

<Callout>
  Family 

  `video`

   · model 

  `kling-3-motion`

   · catalog 

  `model-catalog@2026-10-06.v5`

   · pricing 

  `customer-pricing@2026-11-05.v15`

  .
</Callout>

## Endpoint

```http
POST https://api.roasos.com/v1/video/kling-3-motion
```

Send your API key as a bearer token. The key needs the scope `api:write`. Every paid request also needs an `Idempotency-Key` header.

The envelope fields `quote_only`, `quote_id`, `webhook_url` and `wait_timeout_seconds` behave the same on each model endpoint. Refer to [Jobs](/concepts/jobs) and [Quotes and credits](/concepts/quotes-and-credits).

## Good at

The reference image supplies the character, the background and the other visible elements. The reference video supplies the body motion and, with `character_orientation: "video"`, the camera behaviour. Use it for dance, gesture and presenter moves that must match a source clip exactly. The `standard` tier is the cost-effective mode for portraits and simple animations; the `pro` tier is the choice for full-body motion and detailed clothing. Write the prompt about the subject, the wardrobe, the expression and the style, not about the camera, because the reference video already owns the camera. Keep the reference video short: it decides both the output length and the price. It is the only video model on roasOS that takes a reference video as its motion source, and the only one that requires a recorded media-rights attestation. It does not accept a text-only or image-only request, a last frame, or audio input.

## Pricing

The unit is one **clip**. Pricing keys: `kling-3-motion-pro`, `kling-3-motion-standard`.

The catalog has no credit example for this model. Send `quote_only: true` to get the price.

## Modes

* `motion-control`

Provider endpoints: `fal-ai/kling-video/v3/pro/motion-control` · `fal-ai/kling-video/v3/standard/motion-control`.

## Request fields

| Field                     | Type    | Required | Default    | Rule                              |
| ------------------------- | ------- | -------- | ---------- | --------------------------------- |
| `character_orientation`   | enum    | yes      | `image`    | `image`, `video`                  |
| `extend_of_generation_id` | string  | no       | —          | UUID                              |
| `image_url`               | string  | no       | —          | https URL; ≤ 4,096 characters     |
| `keep_original_sound`     | boolean | yes      | —          | —                                 |
| `media_rights`            | object  | yes      | —          | `{ accepted, statement_version }` |
| `prompt`                  | string  | no       | —          | ≥ 1 character; ≤ 2,500 characters |
| `quote_id`                | string  | no       | —          | UUID                              |
| `quote_only`              | boolean | no       | `false`    | —                                 |
| `scene_id`                | string  | no       | —          | UUID                              |
| `tier`                    | enum    | no       | `standard` | `standard`, `pro`                 |
| `video_url`               | string  | yes      | —          | https URL; ≤ 4,096 characters     |
| `wait_timeout_seconds`    | integer | no       | `0`        | 0–60                              |
| `webhook_url`             | string  | no       | —          | https URL; ≤ 4,096 characters     |

The schema is strict. A field that is not in this table gets `400 unsupported_option`. The field names are the roasOS role names. One role has one name in every family.

## Media

This endpoint accepts these media roles:

* `image_url` — first frame (or the single source image)
* `scene_id` — first frame — a scene this workspace owns
* `video_url` — the source video

| Role        | Items | Maximum size | Content types                           | Duration |
| ----------- | ----- | ------------ | --------------------------------------- | -------- |
| `image_url` | ≤ 1   | 10 MB        | `image/jpeg`, `image/png`, `image/webp` | —        |
| `video_url` | ≤ 1   | 100 MB       | `video/mp4`, `video/quicktime`          | —        |

Every other role is refused: `avatar_id`, `elements`, `product_id`, `product_images`, `references`, `reference_images`, `end_image_url`, `scene_image`, `video_urls`, `audio_urls`, `audio_url`, `voice_id`. A refused role gets `400 unsupported_option`.

<Callout>
  Each media URL must be an immutable object on 

  `https://cdn.roasos.com`

   that your workspace owns. Any other URL gets 

  `400 reference_media_not_workspace_owned`

  . Refer to 

  [Reference media and uploads](/concepts/reference-media)

   to learn how to put a file there.
</Callout>

## Prompt

* Limit: 2,500 characters. No roasOS wrapper; the prompt goes verbatim, or the field is omitted when empty.
* No tags: `@Element1` exists at fal only with `elements`, which roasOS does not expose.
* Craft: name the subject and the wardrobe ("woman in a red linen dress, hair tied back"), the expression ("calm, small smile"), and the style ("natural daylight, realistic skin"). Do not describe camera moves or the motion itself; the video owns both. Keep it short: the image and the video carry the information.

## Not exposed

These catalog entries describe omitted inputs, pinned values and source constraints. They do not imply that the provider accepts every listed field.

* `duration_seconds` — pinned to `measured from video_url`.
* `aspect_ratio` — not accepted by this public endpoint.
* `resolution` — pinned to `named by tier`.
* `generate_audio` — not accepted by this public endpoint.
* `negative_prompt` — not accepted by this public endpoint.
* `seed` — not accepted by this public endpoint.
* `references` — not accepted by this public endpoint.
* `elements` — not accepted by this public endpoint.
* `avatar_id` — not accepted by this public endpoint.
* `product_id` — not accepted by this public endpoint.
* `end_image_url` — not accepted by this public endpoint.

## Result

The result kind is `video`. Always present: `url`.

```json
{
  "data": {
    "id": "gen_…",
    "kind": "video",
    "model": "kling-3-motion",
    "status": "completed",
    "result": {
      "url": "https://cdn.roasos.com/workspaces/ws_01/result"
    }
  }
}
```

The files are immutable objects on `https://cdn.roasos.com`. A result URL is a valid media input for your next request.

## Example

The three steps are always the same: quote, run, poll.

<CodeBlockTabs defaultValue="cURL">
  <CodeBlockTabsList>
    <CodeBlockTabsTrigger value="cURL">
      cURL
    </CodeBlockTabsTrigger>

    <CodeBlockTabsTrigger value="JavaScript">
      JavaScript
    </CodeBlockTabsTrigger>

    <CodeBlockTabsTrigger value="Python">
      Python
    </CodeBlockTabsTrigger>
  </CodeBlockTabsList>

  <CodeBlockTab value="cURL">
    ```bash
    # 1. Quote. Nothing is spent.
    curl -X POST https://api.roasos.com/v1/video/kling-3-motion \
      -H "Authorization: Bearer roasos_sk_live_..." \
      -H "Idempotency-Key: 0f1c9e2a-kling-3-motion-0001" \
      -H "Content-Type: application/json" \
      -d '{"quote_only":true,"character_orientation":"image","image_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/image_url.png","keep_original_sound":false,"media_rights":{"accepted":true,"statement_version":1},"video_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"}'
    # 200 { "data": { "kind": "quote", "quote_id": "q_7Hk...", "credits": ..., "expires_at": "...",
    #        "confirmation": { "model": "kling-3-motion" } } }

    # 2. Run. Same body, same Idempotency-Key, quote_id in place of quote_only.
    curl -X POST https://api.roasos.com/v1/video/kling-3-motion \
      -H "Authorization: Bearer roasos_sk_live_..." \
      -H "Idempotency-Key: 0f1c9e2a-kling-3-motion-0001" \
      -H "Content-Type: application/json" \
      -d '{"quote_id":"q_7Hk...","character_orientation":"image","image_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/image_url.png","keep_original_sound":false,"media_rights":{"accepted":true,"statement_version":1},"video_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"}'
    # 201 { "data": { "id": "gen_...", "status": "queued", "credits_reserved": ... } }

    # 3. Poll, then read the result.
    curl https://api.roasos.com/v1/jobs/gen_.../status -H "Authorization: Bearer roasos_sk_live_..."
    curl https://api.roasos.com/v1/jobs/gen_.../result -H "Authorization: Bearer roasos_sk_live_..."
    ```
  </CodeBlockTab>

  <CodeBlockTab value="JavaScript">
    ```javascript
    const key = process.env.ROASOS_API_KEY;
    const url = "https://api.roasos.com/v1/video/kling-3-motion";
    const idempotencyKey = "0f1c9e2a-kling-3-motion-0001";
    const input = {
      "character_orientation": "image",
      "image_url": "https://cdn.roasos.com/workspaces/ws_01/uploads/image_url.png",
      "keep_original_sound": false,
      "media_rights": {
        "accepted": true,
        "statement_version": 1
      },
      "video_url": "https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"
    };

    const post = (payload) =>
      fetch(url, {
        method: "POST",
        headers: {
          Authorization: `Bearer ${key}`,
          "Idempotency-Key": idempotencyKey,
          "Content-Type": "application/json",
        },
        body: JSON.stringify(payload),
      }).then((response) => response.json());

    // 1. Quote. Nothing is spent.
    const quote = await post({ quote_only: true, ...input });
    console.log(quote.data.credits);

    // 2. Run.
    const job = await post({ quote_id: quote.data.quote_id, ...input });

    // 3. Poll, then read the result.
    let status = "queued";
    while (status !== "completed" && status !== "failed" && status !== "canceled") {
      await new Promise((done) => setTimeout(done, 3000));
      const poll = await fetch(`${url.split("/v1")[0]}/v1/jobs/${job.data.id}/status`, {
        headers: { Authorization: `Bearer ${key}` },
      }).then((response) => response.json());
      status = poll.data.status;
    }

    const result = await fetch(`${url.split("/v1")[0]}/v1/jobs/${job.data.id}/result`, {
      headers: { Authorization: `Bearer ${key}` },
    }).then((response) => response.json());
    console.log(result.data.result);
    ```
  </CodeBlockTab>

  <CodeBlockTab value="Python">
    ```python
    import os, time, requests

    key = os.environ["ROASOS_API_KEY"]
    url = "https://api.roasos.com/v1/video/kling-3-motion"
    headers = {
        "Authorization": f"Bearer {key}",
        "Idempotency-Key": "0f1c9e2a-kling-3-motion-0001",
    }
    payload = {
        "character_orientation": "image",
        "image_url": "https://cdn.roasos.com/workspaces/ws_01/uploads/image_url.png",
        "keep_original_sound": False,
        "media_rights": {
            "accepted": True,
            "statement_version": 1
        },
        "video_url": "https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"
    }

    # 1. Quote. Nothing is spent.
    quote = requests.post(url, headers=headers, json={"quote_only": True, **payload}).json()
    print(quote["data"]["credits"])

    # 2. Run.
    job = requests.post(url, headers=headers, json={"quote_id": quote["data"]["quote_id"], **payload}).json()
    job_id = job["data"]["id"]

    # 3. Poll, then read the result.
    jobs = "https://api.roasos.com/v1/jobs"
    status = "queued"
    while status not in ("completed", "failed", "canceled"):
        time.sleep(3)
        status = requests.get(f"{jobs}/{job_id}/status", headers=headers).json()["data"]["status"]

    result = requests.get(f"{jobs}/{job_id}/result", headers=headers).json()
    print(result["data"]["result"])
    ```
  </CodeBlockTab>
</CodeBlockTabs>

## The deprecated path

`POST /v1/generations` still reaches this model for one minor version. It is deprecated. This is how it maps:

Not available on the public API yet. `POST /v1/generations` returns `503 public_model_unavailable` for `model: "kling-3-motion"`, and the alias will stay refused because it cannot carry `media_rights`. The app reaches the model through its internal UGC route (`image`, `referenceVideo`, `characterOrientation`, `keepOriginalSound`, `quality`, `rightsAccepted`, `rightsStatementVersion`, `rightsPolicyVersion`); at v1.1 these become `image_url`, `video_url`, `character_orientation`, `keep_original_sound`, `tier`, `media_rights{}`. The agent does not offer this model.

## See also

* [`llms.txt` for this model](https://docs.roasos.com/models/video/kling-3-motion/llms.txt) — the same facts as one plain-text file for an agent.
* `GET https://api.roasos.com/v1/catalog/kling-3-motion` — the machine-readable form: enums, defaults, limits and prices. Refer to the [API reference](/api-reference/overview).
* [Jobs](/concepts/jobs) — how to poll a job and read its result.
* Provider endpoints: `fal-ai/kling-video/v3/pro/motion-control` · `fal-ai/kling-video/v3/standard/motion-control`.