LTX 2.3 Reframe

Endpoint

POST https://api.roasos.com/v1/reframe/ltx-2.3

Send your API key as a bearer token. The key needs the scope api:write. Every paid request also needs an Idempotency-Key header.

The envelope fields quote_only, quote_id, webhook_url and wait_timeout_seconds behave the same on each model endpoint. Refer to Jobs and Quotes and credits.

Good at

Take a 16:9 ad to 9:16 without letterboxing it. The model re-frames the shot and paints in what the new edges expose.

The price is billed on the INPUT duration: $0.10 per second at 720p and $0.20 per second at 1080p. A 10-second source costs 12 credits at 720p and 24 at 1080p. The source is capped at 60 seconds, and roasOS measures it before it quotes.

Pricing

The unit is one source_second. Pricing key: ltx-2.3.

The credits come from the roasOS pricing table. No other field changes the price. To get the exact price of your request, send it with quote_only: true first.

Modes

• reframe

Provider endpoints: fal-ai/ltx-2.3/reframe.

Request fields

The schema is strict. A field that is not in this table gets 400 unsupported_option. The field names are the roasOS role names. One role has one name in every family.

Media

This endpoint accepts these media roles:

• video_url — the source video

Every other role is refused: avatar_id, elements, product_id, product_images, references, reference_images, image_url, end_image_url, scene_id, scene_image, video_urls, audio_urls, audio_url, voice_id. A refused role gets 400 unsupported_option.

Prompt

None. This model takes no prompt.

resolution is required and has no default here, although the provider defaults it to 1080p — at twice the 720p rate. Choose it deliberately: a silent default would be a surprise in one direction or the other.

resolution is the OUTPUT tier. It does not change the seconds you are billed for, which are always the seconds of the source.

Not exposed

These catalog entries describe omitted inputs, pinned values and source constraints. They do not imply that the provider accepts every listed field.

• resolution — pinned to required, with no default: fal defaults it to 1080p at twice the rate.

Result

The result kind is video. Always present: url.

{
  "data": {
    "id": "gen_…",
    "kind": "video",
    "model": "ltx-2.3",
    "status": "completed",
    "result": {
      "url": "https://cdn.roasos.com/workspaces/ws_01/result"
    }
  }
}

The files are immutable objects on https://cdn.roasos.com. A result URL is a valid media input for your next request.

Example

The three steps are always the same: quote, run, poll.

# 1. Quote. Nothing is spent.
curl -X POST https://api.roasos.com/v1/reframe/ltx-2.3 \
  -H "Authorization: Bearer roasos_sk_live_..." \
  -H "Idempotency-Key: 0f1c9e2a-ltx-2.3-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_only":true,"aspect_ratio":"1:1","resolution":"720p","video_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"}'
# 200 { "data": { "kind": "quote", "quote_id": "q_7Hk...", "credits": 12, "expires_at": "...",
#        "confirmation": { "model": "ltx-2.3", "example": "10s_source_720p" } } }

# 2. Run. Same body, same Idempotency-Key, quote_id in place of quote_only.
curl -X POST https://api.roasos.com/v1/reframe/ltx-2.3 \
  -H "Authorization: Bearer roasos_sk_live_..." \
  -H "Idempotency-Key: 0f1c9e2a-ltx-2.3-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_id":"q_7Hk...","aspect_ratio":"1:1","resolution":"720p","video_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"}'
# 201 { "data": { "id": "gen_...", "status": "queued", "credits_reserved": 12 } }

# 3. Poll, then read the result.
curl https://api.roasos.com/v1/jobs/gen_.../status -H "Authorization: Bearer roasos_sk_live_..."
curl https://api.roasos.com/v1/jobs/gen_.../result -H "Authorization: Bearer roasos_sk_live_..."

Today

The endpoint is POST /v1/reframe/ltx-2.3.

It is live.

See also

• llms.txt for this model — the same facts as one plain-text file for an agent.
• GET https://api.roasos.com/v1/catalog/ltx-2.3 — the machine-readable form: enums, defaults, limits and prices. Refer to the API reference.
• Jobs — how to poll a job and read its result.
• Provider endpoints: fal-ai/ltx-2.3/reframe.