# sync-3 Lipsync (lipsync)

> 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.

Status: roasOS API v1.1. Catalog `model-catalog@2026-10-06.v5`, pricing `customer-pricing@2026-11-05.v15`. The endpoint `POST /v1/lipsync/sync-lipsync-v3` is live. `POST /v1/generations` stays for one minor version as a deprecated alias (see "Today").

## Endpoint
POST https://api.roasos.com/v1/lipsync/sync-lipsync-v3
Auth: Authorization: Bearer roasos_sk_… (scope api:write). Idempotency-Key required. quote_only / quote_id / webhook_url as in https://docs.roasos.com/llms.txt.

## 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
Unit: second. Pricing key: `sync-lipsync-v3`.

| request | credits |
|---|---|
| `10s` | 16 |

Credits come from the roasOS pricing table (`MODEL_COSTS`) through the catalog. No other field changes the price.

## 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 returns `400 unsupported_option`. Field names are the roasOS role names, one name per role across every family.

## Media
- `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 | max 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` | — |

- 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 returns `400 unsupported_option`.
- Every URL must be an immutable object on `https://cdn.roasos.com/…` that your workspace owns; any other URL is `400 reference_media_not_workspace_owned`. Upload with `POST /v1/uploads` (direct POST of the bytes to `put_url`, or a `source_url` import), then use the returned CDN URL.

## Prompt
None. The endpoint has no prompt.

## Not exposed
The catalog records no pinned or hidden provider field for this model.

## Result
Result kind `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"} } }
```
Files live on `https://cdn.roasos.com` and are immutable; a result URL can be a media input to the next call. Poll `GET /v1/jobs/{id}/status` → `{ id, status, updated_at }`, then `GET /v1/jobs/{id}/result` (`409 run_not_completed` until the job is `completed`, `failed` or `canceled`). Statuses: `queued → processing → completed | failed | canceled`.

## Example
```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 — the same body and the same Idempotency-Key, quote_id instead 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_…", "kind": "lipsync", "model": "sync-lipsync-v3", "status": "queued", "credits_reserved": 16, "links": { "status": "/v1/jobs/gen_…/status", "result": "/v1/jobs/gen_…/result" } } }

# 3. poll
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_…"
```

## Today
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
https://docs.roasos.com/models/lipsync/sync-lipsync-v3 · https://api.roasos.com/v1/catalog/lipsync/sync-lipsync-v3 · fal-ai/sync-lipsync/v3/image-to-video