Kling 2.1 Master API reference
Silent 1080p clips with fine prompt control
Call Kling 2.1 Master 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
- Kuaishou
- Output
- Video
- From
- 32.4 credits per second of output ($0.324)
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
kling/2.1-master/text-to-video
Price
| Option | Credits (per second of output) | US dollars |
|---|---|---|
Default | 32.4 | $0.324 |
Parameters
| Field | Type | Default | Allowed | What it does |
|---|---|---|---|---|
promptRequired | string | — | up to 5,000 characters | Describe the scene, the action and the camera. |
aspect_ratioOptional | string | 16:9 | 16:9, 9:16, 1:1 | Output aspect ratio. |
duration_secondsOptional | integer | 5 | 5, 10 | Output length: 5 or 10 seconds. Billed per second. |
negative_promptOptional | string | — | up to 500 characters | Things the clip should avoid, written as a short list. |
guidance_scaleOptional | number | 0.5 | 0 to 1 | How strictly the clip follows the prompt, from 0 to 1. Higher is more literal, lower gives the model more freedom. |
Example request
This request runs as it is; any field you leave out uses its default. Put your key in POPNOW_API_KEY first.
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": "kling/2.1-master/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
}
}'The response carries a taskId straight away. Read the result with GET /api/v1/jobs/recordInfo, or add callBackUrl to be notified.
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=TASK_ID_FROM_CREATE_TASK" \
-H "Authorization: Bearer $POPNOW_API_KEY"Image to Video
kling/2.1-master/image-to-video
Price
| Option | Credits (per second of output) | US dollars |
|---|---|---|
Default | 32.4 | $0.324 |
Parameters
| Field | Type | Default | Allowed | What it does |
|---|---|---|---|---|
promptRequired | string | — | up to 5,000 characters | Describe what happens after the opening frame: the action, the camera. |
image_urlRequired | string (uri) | — | — | Opening frame. The clip starts from this image. JPEG or PNG only. |
duration_secondsOptional | integer | 5 | 5, 10 | Output length: 5 or 10 seconds. Billed per second. |
negative_promptOptional | string | — | up to 500 characters | Things the clip should avoid, written as a short list. |
guidance_scaleOptional | number | 0.5 | 0 to 1 | How strictly the clip follows the prompt, from 0 to 1. Higher is more literal, lower gives the model more freedom. |
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.
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": "kling/2.1-master/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
}
}'The response carries a taskId straight away. Read the result with GET /api/v1/jobs/recordInfo, or add callBackUrl to be notified.
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=TASK_ID_FROM_CREATE_TASK" \
-H "Authorization: Bearer $POPNOW_API_KEY"