# HeyGen lipsync speed v3

Needs video url and audio url. Served by fal.ai.

Heygen Lipsync - Speed, served by fal.ai. The OpenAPI schema for the fal-ai/heygen/v3/lipsync/speed queue. Price: $0.05 per seconds Actual-cost billing: the initial reservation is an estimate, not a maximum. 30 seconds at $0.05/s; actual input/output duration determines cost. The unique Billing Events receipt for this exact endpoint and request_id is the final USD charge, including usage above the estimate. Missing receipts retain the reservation for reconciliation; no guessed final fee. Asynchronous: returns a request_id; poll fal/status and fetch fal/result with model "fal-ai/heygen" and that request_id. Billed once, when the result is ready; a generation that fails is refunded.

- Tool ID: `fal/heygen-v3-lipsync-speed`
- Name in the catalog: Heygen Lipsync - Speed
- Provider: [fal.ai](/providers/fal.md)
- Capability: [Lip sync](/tools/video-generation/lip-sync.md)
- Price: usage based, the maximum is shown before a run
- Authentication: an authorised Agentik workspace is required for execution, including zero-price tools.

## Pricing contract

Billed at the exact provider cost, without a per-call cap. The initial reservation is an estimate; additional usage is debited and unused funds are refunded.


```json
{
  "model": "reported",
  "costPath": "cost_usd",
  "requireCost": true,
  "costMode": "actual",
  "reservationBasis": "30 seconds at $0.05/s; actual input/output duration determines cost.",
  "maxUsdDefault": 1.5,
  "maxUsdCap": 1.5
}
```

Pricing source: [https://fal.ai/models/fal-ai/heygen/v3/lipsync/speed](https://fal.ai/models/fal-ai/heygen/v3/lipsync/speed). $0.05 per seconds Actual-cost billing: the initial reservation is an estimate, not a maximum. 30 seconds at $0.05/s; actual input/output duration determines cost. The unique Billing Events receipt for this exact endpoint and request_id is the final USD charge, including usage above the estimate. Missing receipts retain the reservation for reconciliation; no guessed final fee..

Price verification date: 2026-10-07.

## Complete input schema


```json
{
  "type": "object",
  "properties": {
    "enable_dynamic_duration": {
      "description": "Allow duration adjustment to match the new audio.",
      "default": true,
      "type": "boolean",
      "title": "Enable Dynamic Duration"
    },
    "enable_caption": {
      "description": "Generate captions in the output video.",
      "default": false,
      "type": "boolean",
      "title": "Enable Caption"
    },
    "audio_url": {
      "type": "string",
      "description": "URL of the replacement audio file.",
      "title": "Audio Url"
    },
    "title": {
      "description": "Optional title for the lipsync job.",
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "title": "Title"
    },
    "video_url": {
      "type": "string",
      "description": "URL of the source video to lip-sync.",
      "title": "Video Url"
    },
    "start_time": {
      "description": "Start time in seconds for partial lipsync.",
      "anyOf": [
        {
          "minimum": 0,
          "type": "number"
        },
        {
          "type": "null"
        }
      ],
      "title": "Start Time"
    },
    "enable_speech_enhancement": {
      "description": "Enhance the replacement audio quality.",
      "default": false,
      "type": "boolean",
      "title": "Enable Speech Enhancement"
    },
    "end_time": {
      "description": "End time in seconds for partial lipsync.",
      "anyOf": [
        {
          "minimum": 0,
          "type": "number"
        },
        {
          "type": "null"
        }
      ],
      "title": "End Time"
    },
    "disable_music_track": {
      "description": "Remove background music from the source video.",
      "default": false,
      "type": "boolean",
      "title": "Disable Music Track"
    }
  },
  "required": [
    "video_url",
    "audio_url"
  ],
  "additionalProperties": false
}
```

## Published example

This is the provider tool’s published example. Replace example values with the user’s requested inputs, respecting the schema; do not execute an example merely to test a connection.


```json
{
  "tool_id": "fal/heygen-v3-lipsync-speed",
  "input": {
    "video_url": "https://v3b.fal.media/files/b/0a9004c7/FM7Q5tK2b59x66Bl8HC0Z_vt-lang-en.mp4",
    "audio_url": "https://v3b.fal.media/files/b/example/new_audio.mp3"
  }
}
```

## Execute and retrieve

Inspect again before execution, explain the price and obtain the required authority. Use MCP run_tool or POST /v1/run with this tool ID, valid input and an idempotency key. Save the returned run ID and follow the actual state. If Agentik answers that the tool is temporarily unavailable, do not retry it blindly; use discovery to propose an alternative.

This tool uses deferred settlement. Follow its returned task/run instructions; preserve the existing reservation until the result is reconciled.

A partial or uncertain result can still have consumed provider resources. Consult [billing](/docs/billing.md), [idempotency](/docs/idempotency.md) and [asynchronous results](/docs/async.md).

[Provider documentation](https://fal.ai/models/fal-ai/heygen/v3/lipsync/speed)

[REST inspection](https://api.agentik.cc/v1/tools/fal/heygen-v3-lipsync-speed) · [OpenAPI](/openapi.json) · [Connection guide](/connect.md)

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[HTML page](/providers/fal/heygen-v3-lipsync-speed) · [Agent index](/llms.txt)