One motion clip, six colorways: Kling 3.0 Motion Control, $1.89 each

Applying one 12-second motion video to six colorway stills of the same product costs $11.34 with Kling 3.0 Motion Control on Sume: $1.89 per clip at $0.1575 per second. The motion is identical across the six, which is the point when you sell one sweater in six colors.

The model is not text-to-video. A motion reference video you supply drives the movement of a still image, so the six outputs differ only in what the still shows.

Price arithmetic

The catalog records the Kling 3.0 Motion Control provider list at $0.126 per second, and Sume bills it at the standard 1.25 margin, which is $0.1575 per second. The charge is per whole second of motion video. Output length follows the driving video, from 1 to 30 seconds.

Request shape

Send exactly one visual source, either image_url or a ready avatar, plus motion_video_url and duration_seconds between 1 and 30. The declared duration is the reservation basis only, since the motion video sets the real length. keep_original_sound defaults to true, so set it to false for a silent clip if you will add your own bed. Reserve the same Idempotency-Key pattern per colorway so a retry never double-charges.

curl -X POST https://api.sume.com/v1/kling/3.0/motion-control \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: sweater-red-motion-01" \
  -d '{
    "image_url": "https://example.com/sweater-red.jpg",
    "motion_video_url": "https://example.com/model-turn.mp4",
    "duration_seconds": 12,
    "keep_original_sound": false,
    "character_orientation": "video"
  }'

When this beats text-to-video

Text-to-video re-invents the motion on every call, so six colorways give six different performances and some will be worse. Motion Control fixes the performance and varies the look, so approval is one decision, not six. Your still is the visual source, which helps when a client will compare the clip with the product page.

Caveats

A person in the motion video is the person who moves, so the motion reference should be a clip you have the right to use. The prompt only steers appearance, and the route rejects Video 1.0 vocabulary such as reference_image_urls. Budget a retry per set: one re-render of the 12-second clip is $1.89.