# Sync v2 (`sync_v2`)

> Sync Labs v2. Good lip-sync at lower cost.

- Capability: Video (tool `video`) — Lip sync
- Price: from $0.50 per run (1 credit = $0.01). Exact price for a request: POST https://api.varg.ai/v2/estimate
- Typical time: ~2 min
- JSON Schema: https://api.varg.ai/v2/tools/video?model=sync_v2 (public, no key)
- Try it: https://varg.ai/dashboard/tools/playground?model=sync_v2

## Call it

REST: `POST https://api.varg.ai/v2/tools/video/call` with `Authorization: Bearer $VARG_API_KEY` (create a key at https://varg.ai/dashboard/api).
It answers `202` with a job right away. Poll `GET /v2/jobs/{id}` until `status` is `completed`, then read `output.outputs[0].url` — or pass `options.webhook_url` and get the finished job POSTed to you.

```bash
curl -X POST https://api.varg.ai/v2/tools/video/call \
  -H "Authorization: Bearer $VARG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "sync_v2",
  "prompt": "talking head, natural lip sync",
  "files": [
    {
      "url": "https://s3.varg.ai/o/job_1d193dc0.mp4"
    },
    {
      "url": "https://s3.varg.ai/o/job_bd6e717e.mp3"
    }
  ]
}'
```

MCP: the varg server `https://mcp.varg.ai/mcp` (OAuth sign-in, no key) runs it with `call_tool`:

```json
{
  "tool": "video",
  "input": {
    "model": "sync_v2",
    "prompt": "talking head, natural lip sync",
    "files": [
      {
        "url": "https://s3.varg.ai/o/job_1d193dc0.mp4"
      },
      {
        "url": "https://s3.varg.ai/o/job_bd6e717e.mp3"
      }
    ]
  },
  "wait": true
}
```

## Inputs

| field | type | required | default | allowed | description |
|---|---|---|---|---|---|
| `model` | string | yes | — | `sync_v2` or a route key below | Which model runs the job. |
| `prompt` | string | no | — | — | — |
| `files` | array of { url } | no | — | — | — |
| `aspect_ratio` | string | no | — | e.g. 16:9 \| 9:16 \| 1:1 \| 4:3 \| 3:4 \| 21:9 \| auto | — |
| `resolution` | string | no | — | 480p \| 720p \| 1080p \| 4k | Quality tier. Not supported by this model — ignored if sent. |
| `audio` | boolean | no | — | — | Native audio track request. Not supported by this model — ignored if sent. |
| `duration` | integer | no | — | 1–120 | Length in seconds. Not mapped by this model — ignored if sent. |

Media inputs are URLs. Upload a local file first with `POST /v2/files` and pass the returned URL.

## Provider options

Optional, per provider, under `provider_options.<provider>`. Only the options of the provider that runs the job apply — pin a route to choose it.

### provider_options.fal

| field | type | required | default | allowed | description |
|---|---|---|---|---|---|
| `audio_url` | string (URL) | no | — | — | — |
| `image_url` | string (URL) | no | — | — | — |
| `video_url` | string (URL) | no | — | — | — |

## Routes

`"model": "sync_v2"` picks a route automatically (priority order, then the inputs you send). To pin one, pass its key as `model`.

| model key | provider | modality | price from | typical time |
|---|---|---|---|---|
| `fal:sync_lipsync` | fal | lipsync | $0.50 | ~2 min |

## Example output

- video/mp4: https://s3.varg.ai/o/job_476d7eb4.mp4

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Catalog version 2026-11-11T12:59:09.901887+00:00. All models: https://varg.ai/models/llms.txt