PixVerse C1 Transition

POST/v1/run

C1 Transition is PixVerse's image-to-video AI model. Bring static images to life with fluid animation, consistent character motion, and professional-grade video output.

Request body

Submit an async generation request. The model field selects the model; other fields are model-specific input parameters.

stringmodelrequired

Model identifier. Set to pixverse/c1/transition.

Default: pixverse/c1/transition

stringpromptrequired

The prompt for the transition

Optional<string>aspect_ratio

The aspect ratio of the generated image.

Allowed values: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16

Optional<string>end_image

URL of the image to use as the last frame

Optional<string>resolution

The resolution of the generated video

Allowed values: 360p, 540p, 720p, 1080p

Default: 720p

Optional<integer>duration

The duration of the generated video in seconds (1-15)

Range: 1 to 15

Default: 5

Optional<integer>seed

The same seed and the same prompt given to the same version of the model will output the same video every time.

Optional<boolean>generate_audio_switch

Enable audio generation (BGM, SFX, dialogue)

Default: false

Optional<string>first_image_url

URL of the image to use as the first frame

Response Schema

The submit endpoint returns an accepted generation task. Poll the result endpoint with the returned id for terminal outputs or errors.

Optional<string>error

Error message if the task failed. Empty on success.

stringidrequired

Unique identifier for the generation task.

Optional<string>model

Model ID used for the prediction.

Optional<array>outputs

Array of generated content. Empty when status is not completed.

stringstatusrequired

Status of the task: pending, running, completed, failed, or timeout.

Allowed values: pending, running, completed, failed, timeout

Model capabilities

array<string>capability_tagsrequired

Capabilities declared by the model registry.

Default: image-to-video

stringexecution_moderequired

Execution mode declared by the model registry.

Default: async

# 1. Submit a generation request
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "pixverse/c1/transition",
  "prompt": "Scene slowly transition into cat swimming under water",
  "aspect_ratio": "21:9",
  "duration": 5
}'

# 2. If the response is still running, poll the returned id
curl https://api.sandbase.ai/v1/run/run_abc123 \
  -H "Authorization: Bearer $SANDBASE_API_KEY"

Response202 Accepted

{
  "id": "run_abc123",
  "model": "pixverse/c1/transition",
  "status": "running",
  "outputs": []
}