# Heygen Lipsync - Precision API

> ᡝᠮᡤᡳᠰᡳ ᠵᠠᡵᡤᠠᠯᠠᠨ ᡩᡝ ᡩᡝᠪᡝᠯᡳᠨ ᠪᡳᠯᠠᠮᡝ ᡤᡝᠮᡠ ᠵᡠᠰᡳ ᡩᡝ ᠠᠮᠠᠯᠠ ᡳ ᡩᠠᠯᠵᡳᠨ ᠵᡠᠰᡳ ᠪᡝ ᠵᠠᡥᡡᠨ ᠵᡠᠰᡳ ᠵᠠᠯᠠᠨ ᠪᡝ ᠪᠠᡳᠨᠠᠮᡝ

ᡝᠮᡤᡳᠰᡳ ᠵᡠᠰᡳ ᡳ ᠵᠠᡵᡤᠠᠯᠠᠨ ᡩᡝ ᡝᠮᡠ ᡤᠠᠯᠠ ᠠᡩᠠᠯᠠᠮᡝ ᠠᠮᠠᠯᠠ ᡳ ᠵᡠᠰᡳ ᠪᡝ ᠵᠠᠯᠠᠨ ᠵᡠᠰᡳ ᡩᡝ ᠠᠴᠠᠮᡝ. `video_url` ᠵᠠᡳ `audio_url` ᡩᡝ ᠵᠠᠯᠠᠨ ᠠᠮᡠᠯᠠᠮᡝ. ᡩᡠᠯᡝᠮᡝ ᠵᠠᡵᡤᠠᠯᠠᠨ ᠪᡝ ᠵᡠᠰᡳᠯᡝᠮᡝ ᡝᠮᡤᡳᠰᡳ ᡩᡝ ᠵᠠᠯᠠᠨ ᠪᠠᠶᠠᠨᠠᠮᡝ, ᡝᠮᡠᠯᡝ ᠵᠠᠯᠠᠨ ᠵᡠᠰᡳ ᡩᡝ ᠠᠴᠠᠮᡝ, ᠮᡠᠰᡳᠨ ᡩᠠᠯᡳ ᠪᡝ ᠠᠯᠠᠮᡝ, ᠵᡠᠰᡳ ᡳ ᡤᡝᠮᡠ ᠵᠠᠯᠠᠨ ᠪᡝ ᠵᠠᡥᡡᠨ ᠪᠠᠶᠠᠨᠠᠮᡝ, ᡳᠨᡠ `start_time` ᠵᠠᡳ `end_time` ᡩᡝ ᠵᠠᠯᠠᠨ ᠪᡝ ᠵᠠᡥᡡᠨ ᠪᠠᠶᠠᠨᠠᠮᡝ. ᡳᠨᡳ ᠵᡠᠰᡳ ᠪᡝ ᠵᠠᡥᡡᠨ ᠵᡠᠰᡳ ᡳ ᠠᠯᡳᠨ ᠪᠠᡳᠨᠠᠮᡝ.

- Model id: `heygen/v3/lipsync/precision`
- Made by: HeyGen
- Category: Lipsync & Avatars
- Output: video
- Price per second of your output video: $0.10 / second of output video (cheapest run $0.10 (100 API credits))
- Run: `POST https://api.doitong.com/v1/run/heygen/v3/lipsync/precision`
- Quote: `POST https://api.doitong.com/v1/quote/heygen/v3/lipsync/precision`
- Docs page: https://doitong.com/mnc/developers/models/heygen/v3/lipsync/precision

## Pricing

Price: **$0.10 / second of output video**. Price per second of your output video: the input files are measured before the run (length, resolution, frame rate). The quote measures the same files and is exactly what the run charges.

The full example input below costs $1.00 = 1000 API credits (10 s output video × $0.10).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). `POST https://api.doitong.com/v1/quote/heygen/v3/lipsync/precision` with the same JSON body returns the exact price for that input; the quote is exactly what a run charges. Invalid input is never charged and failed or canceled requests are refunded automatically.

## Input parameters

Send either the canonical name or the native field name (not both). Canonical names are the same across models.

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `video_url` | `video` | string (video URL) | yes |  |  | ᠮᡠᠰᡝᡳ ᠰᡠᠨᡤᠠᡳ URL ᠪᡝ ᠠᠪᡴᠠᡳ ᠮᡠᠰᡝᡳ ᠠᠰᡳᠮᡝ. |
| `audio_url` | `audio` | string (audio URL) | yes |  |  | ᠰᡳᠯᡤᡳᡩᡝᠮᡝ ᡤᡳᠰᡠᠨᡳ ᡶᡳᠯᡝ URL. |
| `title` |  | string \| null | no |  |  | ᠯᡳᠫ ᠵᠠᠯᠠᠨ ᡳ ᡤᡝᡪᡳᠯᡝᠨ ᡩᡝ ᠵᡠᠯᡝ ᡩᡝᡵᡝᠨ ᡝᠮᡠ ᡤᡡᠯᡳᠨ ᠵᠠᠯᠠᠨ ᠪᡠᡳᠶᡝᠮᡝᠨᡳ ᠨᡳᠶᠠᠯᠮᠠ. |
| `enable_caption` |  | boolean | no | `false` |  | ᠪᡠᠶᡝᠮᡝᠨᡳ ᠰᡠᠨᡤᠠ ᡩᡝ ᠵᡠᡵᡤᠠᠨ ᡳ ᡥᡡᠯᠠᠨ ᠣᠮᠪᡳ ᠣᠮᠪᡳ ᡝᠮᡝ ᡤᠠᠯᠠᡥᠠᠪᡳ ᠣᠮᠪᡳ ᡠᡴᠰᡝ. |
| `enable_dynamic_duration` |  | boolean | no | `true` |  | ᡝᠯᡝᡥᡝ ᡤᡳᠰᡠᠨ ᡳ ᡥᡡᠯᠠᠨ ᡩᡝ ᡥᠠᠴᡳᠨ ᠪᡠᠶᡝᠮᡝᠨᡳ ᠵᠠᠯᠠᠨ ᡳ ᠪᡠᠶᡝᠮᡝ ᠪᡳᠵᡳ ᠣᠮᠪᡳ. |
| `disable_music_track` |  | boolean | no | `false` |  | ᠵᠠᠯᠠᠨ ᡳ ᡩᡠᠮᠪᡳ ᡤᡳᠰᡠᠨ ᡳ ᠠᠰᡠᡥᠠᡳ ᠠᠮᡝᠯᡝ ᡩᡝ ᠠᠰᡠᡥᠠ ᡠᠮᡝᠰᡳ ᠪᡠᠵᠠᡵᠠ. |
| `enable_speech_enhancement` |  | boolean | no | `false` |  | ᡝᠯᡝᡥᡝ ᠵᡠᠯᡝ ᡤᡳᠰᡠᠨ ᡳ ᡴᠠᠮᠪᡠᠯᡝᡥᡝ ᠠᠮᡝᠯᡝ ᠪᡠᠶᡝᠮᡝ. |
| `start_time` |  | number \| null | no |  | ≥ 0 | ᡳᠯᡤᠠᠨ ᡳ ᠪᠠᡳᡨᠠᠯᠠᠨ ᡩᡝ ᠵᠠᠯᠠᠨ ᡳ ᠮᡠᠵᡳᠯᡝᡥᡝ ᠯᡳᠫ ᠪᡠᠶᡝᠮᡝᠨᡳ ᠰᡝᡴᡠᠨᡩ ᠣᠨ. |
| `end_time` |  | number \| null | no |  | ≥ 0 | ᡝᡵᡝᠨ ᡳ ᠪᠠᡳᡨᠠᠯᠠᠨ ᡩᡝ ᠵᠠᠯᠠᠨ ᡳ ᠮᡠᠵᡳᠯᡝᡥᡝ ᠯᡳᠫ ᠪᡠᠶᡝᠮᡝᠨᡳ ᠰᡝᡴᡠᠨᡩ ᠣᠨ. |

File parameters (`video`, `audio`) take a public `https://` URL, a `data:` URI up to 10 MB, or the `file_url` of an upload from `POST /files`.

## Example input

Required parameters only:

```json
{
  "video": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
  "audio": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
}
```

A fuller example:

```json
{
  "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
  "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
}
```

## Run it

Set `DOITONG_API_KEY` to a key from https://doitong.com/developers/dashboard#keys. `?wait=20` returns the finished request in the same call when it is ready within 20 seconds; otherwise poll `GET /requests/{id}` (it also accepts `?wait=`), or pass `webhook_url`.

### curl

```bash
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://api.doitong.com/v1/run/heygen/v3/lipsync/precision?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
  }'

# Still "queued" or "running"? Poll with the id from the response:
curl "https://api.doitong.com/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"
```

### JavaScript

```javascript
const API = "https://api.doitong.com/v1";
const headers = {
  "Authorization": "Bearer " + process.env.DOITONG_API_KEY,
  "Content-Type": "application/json",
};

// Run the model; wait up to 20 s for the finished result in the same call
let res = await fetch(API + "/run/heygen/v3/lipsync/precision?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
  }),
});
let request = await res.json();
if (!res.ok) throw new Error(request.error.code + ": " + request.error.message);

// Not finished yet: long-poll until it is
while (request.status === "queued" || request.status === "running") {
  res = await fetch(API + "/requests/" + request.id + "?wait=20", { headers });
  request = await res.json();
}
if (request.status !== "succeeded") throw new Error(JSON.stringify(request.error));
console.log(request.outputs.map((o) => o.url), request.cost.credits + " API credits ($" + request.cost.usd + ")");
```

### Python

```python
import os
import requests

API = "https://api.doitong.com/v1"
headers = {"Authorization": "Bearer " + os.environ["DOITONG_API_KEY"]}

payload = {
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/heygen/v3/lipsync/precision", params={"wait": 20}, json=payload, headers=headers)
request = r.json()
if not r.ok:
    raise RuntimeError(request["error"]["code"] + ": " + request["error"]["message"])

# Not finished yet: long-poll until it is
while request["status"] in ("queued", "running"):
    request = requests.get(API + "/requests/" + request["id"], params={"wait": 20}, headers=headers).json()
if request["status"] != "succeeded":
    raise RuntimeError(request["error"])
print([o["url"] for o in request["outputs"]], request["cost"]["credits"], "API credits", "$" + request["cost"]["usd"])
```

### MCP

The MCP server at `https://api.doitong.com/v1/mcp` exposes the tools `search_models`, `get_model`, `quote`, `run`, `get_request`, `cancel_request`, `list_requests`, `create_upload` and `get_account`. A `run` call for this model:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "run",
    "arguments": {
      "model_id": "heygen/v3/lipsync/precision",
      "input": {
        "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
        "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
      },
      "wait_seconds": 20
    }
  }
}
```

## Response

Every call returns a request object. `status` is one of `queued`, `running`, `succeeded`, `failed`, `canceled`. `outputs` lists the generated files with URLs on our storage (kept forever, or 7 days with `?storage=temporary`; `storage` says which); `output` is the model's own result object with the same URLs.

```json
{
  "id": "req_8k2m4q7x1z9c3v5b6n0p2r4t",
  "object": "request",
  "model": "heygen/v3/lipsync/precision",
  "status": "succeeded",
  "created_at": "2026-10-20T12:00:00Z",
  "started_at": "2026-10-20T12:00:02Z",
  "completed_at": "2026-10-20T12:00:09Z",
  "queue_position": null,
  "cost": {
    "credits": 1000,
    "usd": "1.00",
    "charged": 1000,
    "refunded": 0
  },
  "input": {
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
  },
  "output": {
    "video": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_name": "0-output.mp4",
      "file_size": 1843200
    },
    "caption_file": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_name": "0-output.mp4",
      "file_size": 1843200
    }
  },
  "outputs": [
    {
      "type": "video",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_size": 1843200,
      "width": 1280,
      "height": 720,
      "duration": 5,
      "stored": true
    }
  ],
  "error": null,
  "metrics": {
    "inference_seconds": 6.8
  },
  "urls": {
    "self": "https://api.doitong.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `video` | object {url, content_type, file_name, file_size} | ᡝᠯᡝᡥᡝ ᡤᡳᠰᡠᠨ ᡩᡝ ᠵᠠᠯᠠᠨ ᡳ ᡥᠠᠮᡳᠨ ᠵᠠᡥᠠ ᠯᡳᠫ ᡳ ᠰᡠᠨᡤᠠ ᡶᡳᠯᡝ. |
| `caption_file` | object {url, content_type, file_name, file_size} \| null | `enable_caption` ᠵᡠᠯᡝᡩᡝ ᠪᡳᠵᡳ ᠮᡝᠨᡳ HeyGen ᡩᡝᡵᡳ ᡶᡳᠯᡝ ᠪᡠᠶᡝᠮᡝᠪᡠᡵᡝ ᡥᡡᠯᠠᠨ ᡳ ᡶᡳᠯᡝ. |

## Related models

- [Heygen Lipsync - Speed](https://doitong.com/developers/models/heygen/v3/lipsync/speed.md) (`heygen/v3/lipsync/speed`): $0.05 / second of output video
- [Kling AI Avatar 2.0 Pro](https://doitong.com/developers/models/kling-video/ai-avatar/v2/pro.md) (`kling-video/ai-avatar/v2/pro`): $0.115 / second of input audio
- [Sync Lipsync 3](https://doitong.com/developers/models/sync-lipsync/v3.md) (`sync-lipsync/v3`): $8.00 / minute of output video
- [VEED Fabric 1.0](https://doitong.com/developers/models/veed/fabric-1.0.md) (`veed/fabric-1.0`): from $0.08 / second of input audio
- [Heygen v5 Digital Twin](https://doitong.com/developers/models/heygen/avatar5/digital-twin.md) (`heygen/avatar5/digital-twin`): $0.10 / second of input audio
- [Heygen · Avatar3 · Digital Twin](https://doitong.com/developers/models/heygen/avatar3/digital-twin.md) (`heygen/avatar3/digital-twin`): $0.034 / second of input audio
- [Heygen · Avatar4 · Digital Twin](https://doitong.com/developers/models/heygen/avatar4/digital-twin.md) (`heygen/avatar4/digital-twin`): $0.10 / second of input audio
- [Heygen · Avatar4 · Image to Video](https://doitong.com/developers/models/heygen/avatar4/image-to-video.md) (`heygen/avatar4/image-to-video`): $0.10 / second of input audio

## Links

- HTML page: https://doitong.com/developers/models/heygen/v3/lipsync/precision
- All models and guides for AI agents: https://doitong.com/developers/llms.txt
- OpenAPI 3.1 with this model's typed request body: https://doitong.com/developers/openapi.json?model=heygen/v3/lipsync/precision
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/heygen/v3/lipsync/precision