HeyGen Lip Sync API

Connect in three steps

1. Get a keyCreate a key in the dashboard after you confirm your email. One key opens every model.
2. Check the pricePOST /v1/price shows the cost of a run in advance, without charging you.
3. Run a task and collect the resultPOST /v1/tasks starts a task, GET /v1/tasks/{id} shows its status and files.

Ready-to-use code

Replace YOUR_API_KEY with your key. The code starts a task and waits for the result. In cURL, repeat the second request with the id from the first response instead of TASK_ID until status becomes succeeded.

curl -X POST "https://api.cyhub.ai/v1/tasks" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  --data '{
  "model": "heygen",
  "settings": {
    "video_url": [
      "https://example.com/speaker.mp4"
    ],
    "audio_url": [
      "https://example.com/new_voice.mp3"
    ]
  }
}'

curl "https://api.cyhub.ai/v1/tasks/TASK_ID" \
  -H "Authorization: Bearer YOUR_API_KEY"

import time

import requests

API = "https://api.cyhub.ai/v1"
HEADERS = {"Authorization": "Bearer YOUR_API_KEY"}

body = {
    "model": "heygen",
    "settings": {
        "video_url": [
            "https://example.com/speaker.mp4",
        ],
        "audio_url": [
            "https://example.com/new_voice.mp3",
        ],
    },
}

response = requests.post(f"{API}/tasks", json=body, headers=HEADERS, timeout=60)
response.raise_for_status()
task = response.json()
while task["status"] in ("queued", "running"):
    time.sleep(5)
    task = requests.get(f"{API}/tasks/{task['id']}", headers=HEADERS, timeout=30).json()
print(task["status"], task["result"])

const API = "https://api.cyhub.ai/v1";
const HEADERS = { Authorization: "Bearer YOUR_API_KEY", "Content-Type": "application/json" };

const body = {
  "model": "heygen",
  "settings": {
    "video_url": [
      "https://example.com/speaker.mp4"
    ],
    "audio_url": [
      "https://example.com/new_voice.mp3"
    ]
  }
};

async function main() {
  let response = await fetch(`${API}/tasks`, { method: "POST", headers: HEADERS, body: JSON.stringify(body) });
  if (!response.ok) throw new Error(await response.text());
  let task = await response.json();
  while (task.status === "queued" || task.status === "running") {
    await new Promise((resolve) => setTimeout(resolve, 5000));
    response = await fetch(`${API}/tasks/${task.id}`, { headers: HEADERS });
    task = await response.json();
  }
  console.log(task.status, task.result);
}

main();

Price before the run

Prices as of 15.10.2026: from 3 ₽. POST /v1/price shows the exact price of your settings.

Send the same settings to POST /v1/price: the response shows the price of the run without charging you.

curl -X POST "https://api.cyhub.ai/v1/price" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  --data '{
  "model": "heygen",
  "settings": {
    "video_url": [
      "https://example.com/speaker.mp4"
    ],
    "audio_url": [
      "https://example.com/new_voice.mp3"
    ]
  }
}'

• amount_minor: the price of the run in minor units (kopecks for rubles)
• currency: the wallet currency
• available_minor: how much your balance has for new tasks right now

Parameters

Model parameters go inside settings. Omitted optional fields take their default values.

modeOptional

Quality. Speed suits a face that barely moves. Precision handles head turns, movement and a partly covered face better, takes longer and costs more.

Type: StringAllowed values: speedprecisionDefault: "speed"

video_urlRequired

One URL of the source video. The speaker's face must be clearly visible, and the video must have its own audio track with speech.

Type: List (String, uri)Maximum items: 1

audio_urlRequired

One URL of the new audio track: the lips move to it.

Type: List (String, uri)Maximum items: 1

enable_dynamic_durationOptional

Fit the length of the finished video to the audio. On: the audio and video lengths must differ by at most 15%, otherwise HeyGen refuses. Off: the video keeps its own length.

Type: BooleanDefault: true

disable_music_trackOptional

Remove the background music from the source video.

Type: BooleanDefault: false

enable_speech_enhancementOptional

Improve how the speech sounds in the finished video.

Type: BooleanDefault: false

keep_the_same_formatOptional

Keep the resolution and bitrate of the source video.

Type: BooleanDefault: true

enable_watermarkOptional

Put a HeyGen watermark on the finished video.

Type: BooleanDefault: false

Parameters not listed here are not accepted: the response is 422 unknown_setting.

Input

• The video is a URL of an MP4, MOV or WebM file up to 200 MB, the audio is a URL of an MP3, WAV, M4A, OGG or FLAC file up to 50 MB. The video is at most 10 minutes long, the audio at most 10 minutes.
• The URLs must be public and start with https://: HeyGen downloads the files itself.
• The source video needs its own audio track with speech: HeyGen uses it to find who speaks and when. It does not accept a video without sound or with silence.
• The video goes to HeyGen whole, and the price follows its full length in seconds.

Request example

Send this JSON to POST /v1/tasks with your API key. To check the price first, send the same JSON to POST /v1/price.

{
  "model": "heygen",
  "settings": {
    "video_url": [
      "https://example.com/speaker.mp4"
    ],
    "audio_url": [
      "https://example.com/new_voice.mp3"
    ]
  }
}

{
  "model": "heygen",
  "settings": {
    "mode": "precision",
    "video_url": [
      "https://example.com/interview.mov"
    ],
    "audio_url": [
      "https://example.com/dub.wav"
    ],
    "enable_dynamic_duration": false,
    "disable_music_track": true
  }
}

The price is calculated when the task is accepted, currency RUB.

Output

• One video with the new audio track.
• Processing usually takes a few minutes, occasionally up to half an hour.

A finished task as GET /v1/tasks/{id} returns it (some fields left out). The caption may sit on the task or on a single file and may be empty; the model picks the file name.

{
  "id": "7c9e6679-7425-40de-944b-e07fc1f90ae7",
  "status": "succeeded",
  "finished_at": "2026-10-01T12:03:41+00:00",
  "result": {
    "caption": "Caption of the result: the model and its settings",
    "texts": [],
    "files_expire_at": "2026-10-08T12:03:41+00:00",
    "files_expired": false,
    "artifacts": [
      {
        "index": 0,
        "kind": "video",
        "filename": "video.mp4",
        "size": 12582912,
        "caption": "",
        "download_path": "/v1/tasks/7c9e6679-7425-40de-944b-e07fc1f90ae7/artifacts/0"
      }
    ]
  }
}

See also

• HeyGen Lip Sync: features and prices
• Similar models: Seedance 2.5 API, Kling 3.0 API, Kling Motion 3.0 API, Veo 3.1 API, Wan 3.0 API, MiniMax H3 (Hailuo 03) API
• API documentation
• API errors and how to handle them