Google - Nano Banana Edit

Endpoint

POST /images/generations

Full URL: https://modelfold.ai/v1/images/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 google/nano-banana-edit for this endpoint Default："google/nano-banana-edit"。 Allowed values：google/nano-banana-edit。 Example：google/nano-banana-edit。
prompt	string	Yes	Prompt required by the ModelFold gateway; at most 2000 characters. The prompt for image editing (Max length: 20000 characters) maxLength: 2000. Example：turn this photo into a character figure. Behind it, place a box with the character’s image printed on it, and a computer showing the Blender modeling process on its screen. In front of the box, add a round plastic base with the character figure standing on it. set the scene indoors if possible。
image_urls	array<string>	Yes	List of URLs of input images for editing,up to 10 images. (File URL after upload, not file content; Accepted types: image/jpeg, image/png, image/webp; Max size: 10.0MB) maxItems: 10.
output_format	string	No	Output format for the images Default："png"。 Allowed values：png / jpeg。 Example：png。
aspect_ratio	string	No	Aspect ratio of the output image. Set this field explicitly. Allowed values：1:1 / 9:16 / 16:9 / 3:4 / 4:3 / 3:2 / 2:3 / 5:4 / 4:5 / 21:9 / auto。 Example：1:1。
image_size	string	No	The aspect ratio of the generated image (this parameter has been replaced by aspect_ratio; please use the latest aspect_ratio parameter). Default："1:1"。 Allowed values：1:1 / 9:16 / 16:9 / 3:4 / 4:3 / 3:2 / 2:3 / 5:4 / 4:5 / 21:9 / auto。 Example：1:1。

Request Example

curl -X POST "https://modelfold.ai/v1/images/generations" \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "google/nano-banana-edit",
  "prompt": "turn this photo into a character figure. Behind it, place a box with the character’s image printed on it, and a computer showing the Blender modeling process on its screen. In front of the box, add a round plastic base with the character figure standing on it. set the scene indoors if possible",
  "image_urls": [
    "https://example.com/reference.png"
  ],
  "output_format": "png",
  "image_size": "1:1"
}'

{
  "model": "google/nano-banana-edit",
  "prompt": "turn this photo into a character figure. Behind it, place a box with the character’s image printed on it, and a computer showing the Blender modeling process on its screen. In front of the box, add a round plastic base with the character figure standing on it. set the scene indoors if possible",
  "image_urls": [
    "https://example.com/reference.png"
  ],
  "output_format": "png",
  "image_size": "1:1"
}

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.png"
    }
  ],
  "usage": {}
}