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LTX-2 19B API reference

20-second clips with voices, music and effects

Call LTX-2 19B from your own code with one PopNow API key. Below are the exact model IDs to send, every input field the model accepts, what each request costs in credits, and a request you can paste into a terminal.

At a glance

Made by
Lightricks
Output
Video
From
2.16 credits per second of output ($0.0216)
Typical time
about 68 s
Model IDs

1 credit = $0.01. A task holds the highest possible charge when it is accepted and settles the real amount when it finishes, rounded up to whole credits; failed tasks are not charged. Ask POST /api/v1/jobs/quote for the exact figure before you run.

Create Video

lightricks/ltx-2-19b/text-to-video

Price

OptionCredits (per second of output)US dollars
480p2.16$0.0216
720p2.88$0.0288
1080p4.32$0.0432

Parameters

FieldTypeDefaultAllowedWhat it does
promptRequiredstring——Describe the scene, the action, the camera and the sound. Put the soundtrack on its own Audio: line.
aspect_ratioOptionalstring16:916:9, 9:16Output aspect ratio.
resolutionOptionalstring720p480p, 720p, 1080pOutput resolution.
duration_secondsOptionalinteger55 to 20Requested output length in whole seconds, from 5 to 20.
seedOptionalinteger—0 to 2147483647Random seed for controlled comparisons, not a frame-identical guarantee.

Example request

This request runs as it is; any field you leave out uses its default. Put your key in POPNOW_API_KEY first.

POST /api/v1/jobs/createTask
curl -X POST "https://api.popnow.ai/api/v1/jobs/createTask" \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "model": "lightricks/ltx-2-19b/text-to-video",
  "input": {
    "prompt": "A paper boat drifts down a rain-soaked street at dusk, neon signs reflecting in the water, slow tracking shot at ground level",
    "duration_seconds": 5,
    "resolution": "720p"
  }
}'

The response carries a taskId straight away. Read the result with GET /api/v1/jobs/recordInfo, or add callBackUrl to be notified.

GET /api/v1/jobs/recordInfo
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=TASK_ID_FROM_CREATE_TASK" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

Image to Video

lightricks/ltx-2-19b/image-to-video

Price

OptionCredits (per second of output)US dollars
480p2.16$0.0216
720p2.88$0.0288
1080p4.32$0.0432

Parameters

FieldTypeDefaultAllowedWhat it does
promptRequiredstring——Describe what happens after the opening frame: the action, the camera and the sound.
image_urlRequiredstring (uri)——Opening frame. The clip starts from this image and keeps its aspect ratio.
resolutionOptionalstring720p480p, 720p, 1080pOutput resolution.
duration_secondsOptionalinteger55 to 20Requested output length in whole seconds, from 5 to 20.
seedOptionalinteger—0 to 2147483647Random seed for controlled comparisons, not a frame-identical guarantee.

Example request

This request runs as it is; any field you leave out uses its default. Put your key in POPNOW_API_KEY first.

The example uses PopNow sample files in image_url. Replace them with your own public HTTPS links, uploads or saved assets.

POST /api/v1/jobs/createTask
curl -X POST "https://api.popnow.ai/api/v1/jobs/createTask" \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "model": "lightricks/ltx-2-19b/image-to-video",
  "input": {
    "prompt": "He lands softly on the rooftop, laughs and turns toward the camera while the balloons sway in the evening breeze; slow push-in",
    "image_url": "https://media.popnow.ai/influencer/examples/marco.webp",
    "duration_seconds": 5,
    "resolution": "720p"
  }
}'

The response carries a taskId straight away. Read the result with GET /api/v1/jobs/recordInfo, or add callBackUrl to be notified.

GET /api/v1/jobs/recordInfo
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=TASK_ID_FROM_CREATE_TASK" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

Extend Video

lightricks/ltx-2-19b/video-extend

Price

OptionCredits (per second of output)US dollars
480p2.16$0.0216
720p2.88$0.0288
1080p4.32$0.0432

Parameters

FieldTypeDefaultAllowedWhat it does
promptRequiredstring——Describe what happens next: the action that follows, the camera move and the sound on an Audio: line.
video_urlRequiredstring (uri)——The clip to continue: MP4, MOV or WebM, up to 60 seconds. Its last frame opens the new segment, and the result is your clip with the new segment joined on.
resolutionOptionalstring720p480p, 720p, 1080pResolution of the new segment. It sets how sharp the new part is generated; match your source clip.
duration_secondsOptionalinteger55 to 20Length of the new segment in whole seconds, from 5 to 20. The source clip is added on top and is not billed.
seedOptionalinteger—0 to 2147483647Random seed for controlled comparisons, not a frame-identical guarantee.

Example request

This request runs as it is; any field you leave out uses its default. Put your key in POPNOW_API_KEY first.

The example uses PopNow sample files in video_url. Replace them with your own public HTTPS links, uploads or saved assets.

POST /api/v1/jobs/createTask
curl -X POST "https://api.popnow.ai/api/v1/jobs/createTask" \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "model": "lightricks/ltx-2-19b/video-extend",
  "input": {
    "prompt": "The flowers keep opening while the camera slowly pulls back to reveal a sunlit meadow",
    "video_url": "https://media.popnow.ai/effects/flower-bloom-1abd6efb.mp4",
    "duration_seconds": 5,
    "resolution": "720p"
  }
}'

The response carries a taskId straight away. Read the result with GET /api/v1/jobs/recordInfo, or add callBackUrl to be notified.

GET /api/v1/jobs/recordInfo
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=TASK_ID_FROM_CREATE_TASK" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

Next steps

On this page

At a glanceCreate VideoImage to VideoExtend VideoNext steps