Google - Nano Banana

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 for this endpoint Default："google/nano-banana"。 Allowed values：google/nano-banana。 Example：google/nano-banana。
prompt	string	Yes	Prompt required by the ModelFold gateway; at most 2000 characters. The prompt for image generation (Max length: 20000 characters) maxLength: 2000. Example：A surreal painting of a giant banana floating in space, stars and galaxies in the background, vibrant colors, digital art。
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image_size	string	No	The aspect ratio of the generated image (this parameter has been replaced by aspect_ratio; please use the latest aspect_ratio parameter).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。
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/images/generations" \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "google/nano-banana",
  "prompt": "A surreal painting of a giant banana floating in space, stars and galaxies in the background, vibrant colors, digital art",
  "output_format": "png",
  "image_size": "1:1"
}'

{
  "model": "google/nano-banana",
  "prompt": "A surreal painting of a giant banana floating in space, stars and galaxies in the background, vibrant colors, digital art",
  "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": {}
}