---
title: "sync-3 Lipsync"
description: "sync-3 turns a single still into a talking character from a voice track. It works with photos, illustrations and animated frames, and it has no creative controls."
url: https://docs.roasos.com/models/lipsync/sync-lipsync-v3
---

# sync-3 Lipsync

<Callout>
  Family 

  `lipsync`

   · model 

  `sync-lipsync-v3`

   · catalog 

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

   · pricing 

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

  .
</Callout>

## Endpoint

```http
POST https://api.roasos.com/v1/lipsync/sync-lipsync-v3
```

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

Drawn, cartoon or stylized faces paired with a voice track. The output matches the duration of the audio. Send an image and an audio file, nothing else. It has no prompt and no aspect ratio control. Use /v1/lipsync/ltx-lipsync when you want a prompt-driven motion, and /v1/lipsync/veed-lipsync-v2 when the source is a video.

## Pricing

The unit is one **second**. Pricing key: `sync-lipsync-v3`.

| Request | Credits |
| ------- | ------- |
| `10s`   | 16      |

The credits come from the roasOS pricing table. No other field changes the price. To get the exact price of your request, send it with `quote_only: true` first.

## Modes

* `image-audio-to-video`

Provider endpoints: `fal-ai/sync-lipsync/v3/image-to-video`.

## Request fields

| Field                  | Type    | Required | Default | Rule                          |
| ---------------------- | ------- | -------- | ------- | ----------------------------- |
| `audio_url`            | string  | yes      | —       | https URL; ≤ 4,096 characters |
| `avatar_id`            | string  | no       | —       | UUID                          |
| `image_url`            | string  | no       | —       | https URL; ≤ 4,096 characters |
| `quote_id`             | string  | no       | —       | UUID                          |
| `quote_only`           | boolean | no       | `false` | —                             |
| `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:

* `avatar_id` — identity; the saved character reference sheet, with a derived portrait only where the model requires a single face or source frame
* `image_url` — first frame (or the single source image)
* `audio_url` — the driving audio track

| Role        | Items | Maximum size | Content types                                                       | Duration |
| ----------- | ----- | ------------ | ------------------------------------------------------------------- | -------- |
| `audio_url` | ≤ 1   | 15 MB        | `audio/mp3`, `audio/mpeg`, `audio/wav`, `audio/wave`, `audio/x-wav` | 0–60 s   |
| `image_url` | ≤ 1   | 10 MB        | `image/jpeg`, `image/png`, `image/webp`                             | —        |

Every other role is refused: `elements`, `product_id`, `product_images`, `references`, `reference_images`, `end_image_url`, `scene_id`, `scene_image`, `video_urls`, `video_url`, `audio_urls`, `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

None. The endpoint has no prompt.

## Not exposed

roasOS pins no provider field for this model.

## Result

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

```json
{
  "data": {
    "id": "gen_…",
    "kind": "lipsync",
    "model": "sync-lipsync-v3",
    "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/lipsync/sync-lipsync-v3 \
      -H "Authorization: Bearer roasos_sk_live_..." \
      -H "Idempotency-Key: 0f1c9e2a-sync-lipsync-v3-0001" \
      -H "Content-Type: application/json" \
      -d '{"quote_only":true,"audio_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/audio_url.mp3","image_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/image_url.png"}'
    # 200 { "data": { "kind": "quote", "quote_id": "q_7Hk...", "credits": 16, "expires_at": "...",
    #        "confirmation": { "model": "sync-lipsync-v3", "example": "10s" } } }

    # 2. Run. Same body, same Idempotency-Key, quote_id in place of quote_only.
    curl -X POST https://api.roasos.com/v1/lipsync/sync-lipsync-v3 \
      -H "Authorization: Bearer roasos_sk_live_..." \
      -H "Idempotency-Key: 0f1c9e2a-sync-lipsync-v3-0001" \
      -H "Content-Type: application/json" \
      -d '{"quote_id":"q_7Hk...","audio_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/audio_url.mp3","image_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/image_url.png"}'
    # 201 { "data": { "id": "gen_...", "status": "queued", "credits_reserved": 16 } }

    # 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/lipsync/sync-lipsync-v3";
    const idempotencyKey = "0f1c9e2a-sync-lipsync-v3-0001";
    const input = {
      "audio_url": "https://cdn.roasos.com/workspaces/ws_01/uploads/audio_url.mp3",
      "image_url": "https://cdn.roasos.com/workspaces/ws_01/uploads/image_url.png"
    };

    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/lipsync/sync-lipsync-v3"
    headers = {
        "Authorization": f"Bearer {key}",
        "Idempotency-Key": "0f1c9e2a-sync-lipsync-v3-0001",
    }
    payload = {
        "audio_url": "https://cdn.roasos.com/workspaces/ws_01/uploads/audio_url.mp3",
        "image_url": "https://cdn.roasos.com/workspaces/ws_01/uploads/image_url.png"
    }

    # 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:

The endpoint is `POST /v1/lipsync/sync-lipsync-v3` with `image_url` (or `avatar_id`) and `audio_url`.

The deprecated alias does not carry this model: `POST /v1/generations` `{ "type": "lipsync" }` returns 503 `lipsync_public_authority_unavailable` for every lipsync model except `ltx-lipsync`.

## See also

* [`llms.txt` for this model](https://docs.roasos.com/models/lipsync/sync-lipsync-v3/llms.txt) — the same facts as one plain-text file for an agent.
* `GET https://api.roasos.com/v1/catalog/sync-lipsync-v3` — 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/sync-lipsync/v3/image-to-video`.