Bytedance Seedance 1.5 Pro

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 bytedance/seedance-1.5-pro for this endpoint Default："bytedance/seedance-1.5-pro"。 Allowed values：bytedance/seedance-1.5-pro。 Example：bytedance/seedance-1.5-pro。
prompt	string	Yes	Prompt required by the ModelFold gateway; at most 2000 characters. The text prompt used to generate the video. Required field. (Min length: 3, Max length: 20000 characters) minLength: 3. maxLength: 2000. Example：A serene beach at sunset with waves gently crashing on the shore, palm trees swaying in the breeze, and seagulls flying across the orange sky。
input_urls	array<string>	No	URLs of input images for image-to-video generation. Optional field. - Accepts 0-2 images - If not provided, the model will perform text-to-video generation - File URLs after upload, not file content - Accepted types: image/jpeg, image/png, image/webp - Max size per image: 10.0MB maxItems: 2.
aspect_ratio	string	Yes	Required. One of 1:1, 4:3, 3:4, 16:9, 9:16, 21:9. Allowed values：1:1 / 4:3 / 3:4 / 16:9 / 9:16 / 21:9。 Example：1:1。
resolution	string	No	Video resolution - 480p for faster generation, 720p for balance, 1080p for higher quality Default："720p"。 Allowed values：480p / 720p / 1080p。 Example：720p。
duration	number	Yes	Required. Output length in whole seconds, 4–12. ModelFold minimum: 4 seconds; -1 is not supported.
fixed_lens	boolean	No	Seedance adds dynamic camera movement. Enable this feature to lock the camera for stable, static shots. - true: Lock camera for static shots - false: Allow dynamic camera movement Default：false。 Example：false。
generate_audio	boolean	No	Whether to generate synchronized audio. Default: true. Pass false for a silent video. Audio doubles the per-second price. Default：true。 Example：false。
nsfw_checker	boolean	No	Defaults to false. When false, no additional content filtering is applied and results are returned directly by the model.

Request Example

curl -X POST "https://modelfold.ai/v1/videos/generations" \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "bytedance/seedance-1.5-pro",
  "prompt": "A serene beach at sunset with waves gently crashing on the shore, palm trees swaying in the breeze, and seagulls flying across the orange sky",
  "aspect_ratio": "1:1",
  "duration": 5,
  "resolution": "720p",
  "fixed_lens": false,
  "generate_audio": true
}'

{
  "model": "bytedance/seedance-1.5-pro",
  "prompt": "A serene beach at sunset with waves gently crashing on the shore, palm trees swaying in the breeze, and seagulls flying across the orange sky",
  "aspect_ratio": "1:1",
  "duration": 5,
  "resolution": "720p",
  "fixed_lens": false,
  "generate_audio": true
}

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": {}
}