# imgzen Gemini 3 Pro Image (nano-banana-pro)

> imgzen Gemini 3 Pro Image (nano-banana-pro) is a paid API for AI agents from api.imgzen.dev, paid per call via x402, $0.2/call, status down (last checked 2026-09-14, last successful call 2026-05-28).

Generates high-quality images with best-in-class text rendering using Google Gemini 3 Pro, supporting resolutions up to 4K and multiple aspect ratios

## Facts

- Endpoint: POST https://api.imgzen.dev/v1/models/nano-banana-pro/generate
- Price: $0.2/call
- Payment: x402
- Status: down
- Last checked: 2026-09-14
- Last successful call: 2026-05-28
- Success rate: 45% of calls made through Zero
- Rating: 3.0 / 5 from 3 reviews
- Activations on Zero: 93
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-imgzen-dev-4da6e81c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aEQXLOoRGVafWuu53FD_w

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 api-imgzen-dev-4da6e81c -d '<json body>'
```

Example prompt: Generate a 4K square image of a retro diner menu board with the text 'Daily Special: Pancakes $5.99' written in bold chalk lettering — I need the text to be super crisp and readable, use imgzen's best Google model.

## When to prefer this

Choose this endpoint when the highest text-rendering quality is critical — e.g., posters, infographics, signs, menus, or any image where legible typography matters. At $0.200/image it is the premium option on the imgzen platform, suitable when quality outweighs cost. Prefer this over nano-banana ($0.020) or GPT Image 1 ($0.100) when Google's best model and superior text accuracy are required.

## Known failure modes

- Invalid or unsupported aspect ratio enum value — returns validation error
- Quality value outside allowed enum (1k/2k/4k) — returns 400 error
- Malformed prompt or empty body — may return 422 unprocessable entity
- Payment failure or insufficient funds via x402 — returns 402 Payment Required
- Upstream Google Gemini model unavailability — returns 503 or timeout
- Image array contains invalid URLs or unsupported formats — returns processing error

## How this service works

imgzen — Gemini 3 Pro Image (aka nano-banana-pro), best text rendering by Google — $0.200/image

## Output

Returns a JSON object with status, a URL pointing to the generated image, the model and provider used, generation time in milliseconds, and payment confirmation details including amount (0.200 USDC) and method.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [],
 "properties": {
  "image": {
   "type": "array",
   "items": {
    "type": "string"
   }
  },
  "prompt": {
   "type": "string",
   "description": "Text prompt describing the image to generate or edit"
  },
  "quality": {
   "enum": [
    "1k",
    "2k",
    "4k"
   ],
   "type": "string",
   "default": "2k",
   "description": "Output quality: 1k, 2k, 4k"
  },
  "aspect_ratio": {
   "enum": [
    "1:1",
    "2:3",
    "3:2",
    "3:4",
    "4:3",
    "4:5",
    "5:4",
    "9:16",
    "16:9",
    "21:9"
   ],
   "type": "string",
   "default": "1:1",
   "description": "Image aspect ratio"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "status",
  "output",
  "payment"
 ],
 "properties": {
  "output": {
   "type": "object",
   "required": [
    "url",
    "provider",
    "model",
    "duration_ms"
   ],
   "properties": {
    "url": {
     "type": "string"
    },
    "model": {
     "type": "string"
    },
    "provider": {
     "type": "string"
    },
    "duration_ms": {
     "type": "number"
    }
   }
  },
  "status": {
   "type": "string"
  },
  "payment": {
   "type": "object",
   "required": [
    "method",
    "amount",
    "currency"
   ],
   "properties": {
    "amount": {
     "type": "string"
    },
    "method": {
     "type": "string"
    },
    "currency": {
     "type": "string"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-imgzen-dev-4da6e81c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.imgzen.dev](https://www.zero.xyz/host/api.imgzen.dev/llms.txt)