LTX 2 19B

High-performance video generation with LoRA fine-tuning support

Endpoints

Method	Endpoint	Description
POST	`/api/v1/generateTask/ltx-2-19b`	Create generation task
GET	`/api/v1/statusTask/ltx-2-19b`	Query task status

Authentication

All requests require an API Key in the header:

Authorization: Bearer YOUR_API_KEY

Request Body

{
  "request_type": "async",
  "callback_url": "https://...",
  "provider": "auto",
  "input": {
    "mode": "text-to-video",
    "prompt": "...",
    "resolution": "1080p",
    "duration": 10,
    "aspect_ratio": "16:9",
    "image_urls": ["..."],
    "seed": 12345,
    "loras": [
      {"path": "...", "scale": 1.2}
    ]
  }
}

Parameters

Parameter

Required

Default

Description

request_typestring

—

async

async (polling) or callback (webhook)

callback_urlstring

✱

—

Callback URL, required when request_type=callback

providerstring

—

auto

Routing strategy: auto, value, or official

inputobject

✓

—

Model input parameters

Mode Options:

text-to-video — Generate video from text
image-to-video — Generate video from image
text-to-video-LoRA — Text-to-video with LoRA
image-to-video-LoRA — Image-to-video with LoRA

Example

Text-to-Video

curl -X POST "https://api.apixo.ai/api/v1/generateTask/ltx-2-19b" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "input": {
      "mode": "text-to-video",
      "prompt": "a futuristic city with flying cars at sunset",
      "resolution": "1080p",
      "duration": 10,
      "aspect_ratio": "16:9",
      "seed": 54248617
    }
  }'

Image-to-Video with LoRA

curl -X POST "https://api.apixo.ai/api/v1/generateTask/ltx-2-19b" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "callback",
    "callback_url": "https://your-server.com/callback",
    "provider": "official",
    "input": {
      "mode": "image-to-video-LoRA",
      "prompt": "make it cinematic with slow pan and dramatic lighting",
      "resolution": "720p",
      "duration": 8,
      "image_urls": ["https://example.com/ref.jpg"],
      "loras": [
        {
          "path": "https://huggingface.co/username/model.safetensors?download=true",
          "scale": 1.2
        }
      ]
    }
  }'

Text-to-Video with Multiple LoRAs

curl -X POST "https://api.apixo.ai/api/v1/generateTask/ltx-2-19b" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "input": {
      "mode": "text-to-video-LoRA",
      "prompt": "anime style magical girl transformation sequence",
      "resolution": "720p",
      "duration": 12,
      "aspect_ratio": "9:16",
      "loras": [
        {"path": "https://huggingface.co/user1/anime_style.safetensors?download=true", "scale": 1.5},
        {"path": "https://huggingface.co/user2/magic_effects.safetensors?download=true", "scale": 0.8}
      ]
    }
  }'

Response

POST /api/v1/generateTask/ltx-2-19b

Returns taskId on success for subsequent status queries.

Success:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678"
  }
}

Error:

{
  "code": 400,
  "message": "Insufficient credits",
  "data": null
}

GET /api/v1/statusTask/ltx-2-19b

Query task execution status and results via taskId.

curl -X GET "https://api.apixo.ai/api/v1/statusTask/ltx-2-19b?taskId=task_12345678" \
  -H "Authorization: Bearer YOUR_API_KEY"

Success:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "success",
    "resultJson": "{\"resultUrls\":[\"https://r2.apixo.ai/video.mp4\"]}",
    "createTime": 1767965610929,
    "completeTime": 1767965652317,
    "costTime": 41388
  }
}

Failed:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "failed",
    "failCode": "CONTENT_VIOLATION",
    "failMsg": "Content does not meet safety guidelines"
  }
}

Status Response Fields

Field	Type	Description
`taskId`	string	Unique task identifier
`state`	string	`pending` `processing` `success` `failed`
`resultJson`	string	JSON containing `resultUrls` array (on success)
`failCode`	string	Error code (on failure)
`failMsg`	string	Error message (on failure)
`createTime`	integer	Task creation timestamp (ms)
`completeTime`	integer	Task completion timestamp (ms)
`costTime`	integer	Processing duration (ms)

Error Codes

Code	Description
400	Invalid parameters or request error
401	Invalid or missing API Key
429	Rate limit exceeded

Fail Code	Description
`CONTENT_VIOLATION`	Content violates safety guidelines
`INVALID_IMAGE_URL`	Cannot access provided image URL
`INVALID_LORA_URL`	Cannot download LoRA model

Rate Limits

Limit	Value
Requests	10000 / minute
Concurrent tasks	1000

Exceeding limits returns 429 error. Wait and retry.

Tips

Generation time:
- 480p: ~40-60 seconds
- 720p: ~60-90 seconds
- 1080p: ~90-120 seconds
- LoRA mode adds 10-20 seconds for loading
- Submit task, wait 60 seconds, then poll every 5 seconds
Callback mode: Video generation takes time, strongly recommend using callback mode.
Video expiration: Result URLs are valid for 15 days. Download promptly.
Content moderation: Prompts must comply with content safety guidelines.
LoRA fine-tuning:
- Load custom LoRA models for specific styles or characters
- LoRA URL must be publicly downloadable (HuggingFace, Civitai, etc.)
- URL should include ?download=true or similar download parameters
- Max 3 LoRA models simultaneously
- scale parameter controls LoRA influence, recommended: 0.5-2.0
Resolution selection:
- 480p: Fast generation, for previews
- 720p: Balanced quality and speed
- 1080p: Highest quality, for final output
Duration: Supports flexible 5-20 second duration, billed per second.
Seed reproduction: Same seed + prompt + parameters reproduces identical results.
Image formats: image_urls supports JPG, PNG, WebP, max 10MB per image.
LoRA compatibility: Use video-trained LoRAs; image LoRAs may not work well.

LTX 2 19B

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