Kling V2.1 Standard

Endpoint

POST /videos/generations

Full URL: https://modelfold.ai/v1/videos/generations

Authentication: every request must include the Authorization: Bearer <API_KEY> header.

Send model parameters directly in the JSON body. Do not wrap them in input. This request waits for generation to finish and returns data[].url; supported media models also offer async jobs, polling and callbacks. Replace example media URLs with your own publicly accessible files. See API gateway for billing and errors.

Input parameters for the generation task

Request Parameters

Body (application/json)

Parameter	Type	Required	Description
model	string	Yes	The model name to use for generation. Required field. - Must be kling/v2-1-standard for this endpoint Default："kling/v2-1-standard"。 Allowed values：kling/v2-1-standard。 Example：kling/v2-1-standard。
prompt	string	Yes	Prompt required by the ModelFold gateway; at most 2000 characters. Text prompt describing the desired video content (Max length: 5000 characters) maxLength: 2000. Example：Begin with the uploaded image as the first frame. Gradually animate the scene: steam rises and drifts upward from the train; lantern lights flicker subtly; cloaked figures begin to move slowly — walking, turning, adjusting their belongings. Floating dust or magical particles catch the light. The text “KLING 2.1 STANDARD API — Now on modelfold.ai” softly pulses with a golden glow. The camera pushes forward slightly, then slowly fades to black.。
image_url	string	Yes	URL of the image to be used for the video (File URL after upload, not file content; Accepted types: image/jpeg, image/png; Max size: 10.0MB) Example：https://example.com/your-image.png。
duration	string	Yes	Required. "5" or "10" (seconds). Allowed values：5 / 10。 Example：5。
negative_prompt	string	No	Description of elements to avoid in the generated video (Max length: 500 characters) maxLength: 500. Example：blur, distort, and low quality。
cfg_scale	number	No	The CFG (Classifier Free Guidance) scale is a measure of how close you want the model to stick to your prompt (Min: 0, Max: 1, Step: 0.1) (step: 0.1) Default：0.5。 minimum: 0. maximum: 1. Example：0.5。

Request Example

curl -X POST "https://modelfold.ai/v1/videos/generations" \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "kling/v2-1-standard",
  "prompt": "Begin with the uploaded image as the first frame. Gradually animate the scene: steam rises and drifts upward from the train; lantern lights flicker subtly; cloaked figures begin to move slowly — walking, turning, adjusting their belongings. Floating dust or magical particles catch the light. The text “KLING 2.1 STANDARD API — Now on ModelFold” softly pulses with a golden glow. The camera pushes forward slightly, then slowly fades to black.",
  "image_url": "https://example.com/your-image.png",
  "duration": "5",
  "cfg_scale": 0.5
}'

{
  "model": "kling/v2-1-standard",
  "prompt": "Begin with the uploaded image as the first frame. Gradually animate the scene: steam rises and drifts upward from the train; lantern lights flicker subtly; cloaked figures begin to move slowly — walking, turning, adjusting their belongings. Floating dust or magical particles catch the light. The text “KLING 2.1 STANDARD API — Now on ModelFold” softly pulses with a golden glow. The camera pushes forward slightly, then slowly fades to black.",
  "image_url": "https://example.com/your-image.png",
  "duration": "5",
  "cfg_scale": 0.5
}

Response

200 — Generation completed. usage contains actual billing details; result URLs are illustrative.

{
  "ok": true,
  "created": 1792134000,
  "data": [
    {
      "url": "https://modelfold.ai/uploads/outputs/result.mp4"
    }
  ],
  "usage": {}
}