# Google Gemini 3 Pro Image Generation (Nano Banana Pro)

> Google Gemini 3 Pro Image Generation (Nano Banana Pro) is a paid API for AI agents from image.withzero.xyz, paid per call via MPP, $0.14/call, status unknown (last checked 2026-09-13).

Generates 1–4 highest-quality photorealistic images from a text prompt using Google's Gemini 3 Pro Image model, returning hosted image URLs.

## Facts

- Endpoint: POST https://image.withzero.xyz/api/v1/images/nano-banana-pro
- Price: $0.14/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 3
- Provider: image.withzero.xyz
- Website: https://image.withzero.xyz
- Canonical page: https://www.zero.xyz/c/image-withzero-xyz-google-gemini-3-pro-image-generation-nano-banana-pro-f422560b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2eI5h9X0cFU-Gs_TzD8OS

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability image-withzero-xyz-google-gemini-3-pro-image-generation-nano-banana-pro-f422560b -d '<json body>'
```

Example prompt: Generate 2 photorealistic images of a misty Japanese forest at sunrise with golden light filtering through ancient cedar trees — use the highest-quality Gemini Pro image model and give me the hosted URLs.

## When to prefer this

Choose this endpoint when you need the absolute highest-quality, most photorealistic image output from a Google model. Prefer this over the Flash (Nano Banana 2) variant when quality matters more than speed or cost, and over OpenAI GPT-5 Image or xAI Grok Imagine when you specifically want Google Gemini's photorealistic rendering style.

## Known failure modes

- Prompt exceeds 4000 character limit — request rejected with validation error
- Count outside 1–4 range — request rejected with schema validation error
- Model unavailable or rate-limited — server error returned
- Prompt contains policy-violating content — generation refused
- Network timeout during image rendering — partial or no response

## How this service works

Generate images from a text prompt with Google's Nano Banana Pro (Gemini 3 Pro Image) — highest-quality photorealistic output. Returns hosted image URLs.

## Output

Returns an array of 1–4 generated images, each with a hosted URL, MIME type, and file size in bytes, along with the model name used and the USDC amount charged for the request.

## Example request

```json
{
 "count": 2,
 "prompt": "A serene landscape photograph of a misty mountain valley at dawn, with soft golden sunlight breaking through the clouds and reflecting off a calm alpine lake below"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "example": {
  "count": 1,
  "prompt": "A watercolor painting of a lighthouse at sunrise"
 },
 "required": [
  "prompt",
  "count"
 ],
 "properties": {
  "count": {
   "type": "integer",
   "default": 1,
   "maximum": 4,
   "minimum": 1,
   "description": "How many images to generate (1–4)."
  },
  "prompt": {
   "type": "string",
   "maxLength": 4000,
   "minLength": 1,
   "description": "Text description of the image to generate."
  }
 },
 "additionalProperties": false
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "images",
  "model",
  "price_usdc"
 ],
 "properties": {
  "model": {
   "type": "string",
   "description": "The model that produced the images."
  },
  "images": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "url",
     "mimeType",
     "sizeBytes"
    ],
    "properties": {
     "url": {
      "type": "string"
     },
     "mimeType": {
      "type": "string"
     },
     "sizeBytes": {
      "type": "number"
     }
    },
    "additionalProperties": false
   },
   "description": "The generated images, as hosted URLs."
  },
  "price_usdc": {
   "type": "string",
   "description": "The amount charged for this request, in USDC."
  }
 },
 "additionalProperties": false
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/image-withzero-xyz-google-gemini-3-pro-image-generation-nano-banana-pro-f422560b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from image.withzero.xyz](https://www.zero.xyz/host/image.withzero.xyz/llms.txt)