HappyHorse-1-1 image-to-video

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 used for generation. This endpoint must use happyhorse-1-1/image-to-video. Default："happyhorse-1-1/image-to-video"。 Allowed values：happyhorse-1-1/image-to-video。 Example：happyhorse-1-1/image-to-video。
prompt	string	Yes	Prompt required by the ModelFold gateway; at most 2000 characters. Describes the video content to generate. Supports any language. Maximum: 5,000 non-Chinese characters or 2,500 Chinese Default：""。 maxLength: 2000. Example：``。
image_urls	array<string>	Yes	The URL of the first frame image. Image constraints: 1. Formats: JPEG, JPG, PNG, WEBP. 2. Resolution: Width and height must both be at least 300 pixels. 3. Aspect ratio: Between 1:2.5 and 2.5:1. 4. File size: Up to 20 MB. maxItems: 1.
resolution	string	No	The resolution of the generated video. Options: 720p; 1080p The output keeps the aspect ratio of the input image; 720p / 1080p set the resolution tier. Default："1080p"。 Allowed values：720p / 1080p。 Example：1080p。
duration	number	No	The duration of the generated video, in seconds. The value must be an integer in the range [3, 15]. Default: 5 Default：5。 minimum: 3. maximum: 15. Example：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": "happyhorse-1-1/image-to-video",
  "image_urls": [
    "https://example.com/reference.png"
  ],
  "prompt": "A paper boat drifting down a rainy street.",
  "resolution": "1080p",
  "duration": 5
}'

{
  "model": "happyhorse-1-1/image-to-video",
  "image_urls": [
    "https://example.com/reference.png"
  ],
  "prompt": "A paper boat drifting down a rainy street.",
  "resolution": "1080p",
  "duration": 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": {}
}