HappyHorse - 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 to use for generation. Required field. - Must be happyhorse/image-to-video for this endpoint Default："happyhorse/image-to-video"。 Allowed values：happyhorse/image-to-video。 Example：happyhorse/image-to-video。
prompt	string	Yes	Prompt required by the ModelFold gateway; at most 2000 characters. Text prompt describing the video to generate (any language). Up to 5,000 characters. maxLength: 2000. Example：A cat running on the grass。
image_urls	array<string>	Yes	First-frame image URL list. Exactly one image is required. Image constraints: Format: JPEG, JPG, PNG, WEBP. Resolution: Width and height must be at least 300 pixels. Aspect ratio: 1:2.5 to 2.5:1. File size: Up to 10 MB. maxItems: 1.
resolution	string	No	Output video resolution: 720p or 1080p (default). 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	integer	No	Output duration in seconds. Must be between 3 and 15. Defaults to 5. Default：5。 minimum: 3. maximum: 15. Example：5。
seed	integer	No	Random seed for reproducibility. Default：0。 minimum: 0. maximum: 2147483647. Example：0。

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/image-to-video",
  "image_urls": [
    "https://example.com/reference.png"
  ],
  "prompt": "A cat running on the grass",
  "resolution": "1080p",
  "duration": 5,
  "seed": 0
}'

{
  "model": "happyhorse/image-to-video",
  "image_urls": [
    "https://example.com/reference.png"
  ],
  "prompt": "A cat running on the grass",
  "resolution": "1080p",
  "duration": 5,
  "seed": 0
}

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": {}
}