curl --request POST \
  --url https://api.modellix.ai/api/v1/pixverse/lipsync \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "video": "https://example.com/talk.mp4"
}
'

{
  "code": 0,
  "message": "success",
  "data": {
    "status": "pending",
    "task_id": "task-pixverse-lipsync-001",
    "model_id": "pixverse/lipsync",
    "get_result": {
      "method": "GET",
      "url": "https://api.modellix.ai/api/v1/tasks/task-pixverse-lipsync-001"
    }
  }
}

{
  "code": 400,
  "message": "Invalid parameters: parameter 'video' is required"
}

{
  "code": 401,
  "message": "Authentication failed: invalid API key"
}

{
  "code": 429,
  "message": "Rate limit exceeded: 100 requests per minute, retry after 60 seconds"
}

{
  "code": 500,
  "message": "Internal server error"
}

Lip Sync

[Core Function] PixVerse Lip Sync drives a talking video so the subject’s lips match given audio or text-to-speech. [Strengths] Accurate lip synchronization for talking-head videos; supports either an existing audio track or TTS from a chosen speaker voice. [Best For] Dubbing, virtual presenters, character dialogue, localizing spoken video. [Limitations] Do NOT use this to generate new motion or change content; it only re-times the subject’s lips on an existing video. It requires an input video, and you must provide EITHER audio_url OR (speaker_id + tts_content), not both. [Routing] Use when the user has a video and wants the speaker’s lips to match speech. Use audio_url for an existing voice track; use speaker_id (a named voice code) + tts_content (max 140 chars) to synthesize speech from text.

POST

pixverse

lipsync

curl --request POST \
  --url https://api.modellix.ai/api/v1/pixverse/lipsync \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "video": "https://example.com/talk.mp4"
}
'

{
  "code": 0,
  "message": "success",
  "data": {
    "status": "pending",
    "task_id": "task-pixverse-lipsync-001",
    "model_id": "pixverse/lipsync",
    "get_result": {
      "method": "GET",
      "url": "https://api.modellix.ai/api/v1/tasks/task-pixverse-lipsync-001"
    }
  }
}

{
  "code": 400,
  "message": "Invalid parameters: parameter 'video' is required"
}

{
  "code": 401,
  "message": "Authentication failed: invalid API key"
}

{
  "code": 429,
  "message": "Rate limit exceeded: 100 requests per minute, retry after 60 seconds"
}

{
  "code": 500,
  "message": "Internal server error"
}

Authorizations

Authorization

string

header

required

API Key authentication. Format: Bearer YOUR_API_KEY.

Body

application/json

PixVerse lip sync request. Requires an input video plus a speech source: provide EITHER audio_url, OR speaker_id together with tts_content. audio_url and speaker_id are mutually exclusive; tts_content requires speaker_id.

video

string

required

Input talking video URL (publicly accessible).

Minimum string length: 1

Example:

"https://example.com/talk.mp4"

audio_url

string

Audio track URL to lipsync against. Mutually exclusive with speaker_id/tts_content.

Example:

"https://example.com/voice.mp3"

speaker_id

enum<string>

TTS speaker voice (semantic code; as of 2026-06-26): emily, james, isabella, liam, chloe, adrian, harper, ava, sophia, julia, mason, jack, oliver, ethan, or auto (auto-select). Use together with tts_content. Mutually exclusive with audio_url.

Available options:

emily,

james,

isabella,

liam,

chloe,

adrian,

harper,

ava,

sophia,

julia,

mason,

jack,

oliver,

ethan,

auto

Example:

"emily"

tts_content

string

Text (<=140 chars) to synthesize into speech with speaker_id. Requires speaker_id.

Maximum string length: 140

Example:

"Hello, welcome to our product demo."

Response

Task submitted successfully

code

integer

required

Response code, 0 indicates success

Example:

0

message

string

required

Response message

Example:

"success"

data

object

required

Detailed data about the submitted asynchronous task.

Show child attributes

C1 t2v Motion control