# Nano Banana Pro API

> Google's most capable Nano Banana — premium, high-fidelity image generation and editing with sharper detail and text.

- **Provider**: Google
- **Model id**: `nano-banana-pro`
- **Modality**: image
- **Price**: 12.32–16.42 credits

## Overview

Nano Banana Pro is called in two steps: create a generation task, then poll the task until the result is ready.

## Authentication

All requests require a Bearer Token in the request header:

```
Authorization: Bearer YOUR_API_KEY
```

## Create Task

`POST https://you.bot/api/v1/generate`

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| modelId | string | Yes | Model id: `nano-banana-pro` |
| input | object | Yes | Input parameters object (see below) |
| callbackUrl | string | No | https URL to receive a signed webhook on completion |

### input object parameters

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| prompt | string | Yes | A text description of the image you want to generate (default: Retro comic strip of a cat astronaut discovering a planet made of yarn, four panels, halftone print texture.) |
| image_input | string[] | No | Input images to transform or use as reference (supports up to 8 images) (image URL) |
| aspect_ratio | string | No | Aspect ratio of the generated image (options: 1:1 | 2:3 | 3:2 | 3:4 | 4:3 | 4:5 | 5:4 | 9:16 | 16:9 | 21:9 | auto) (default: 1:1) |
| resolution | string | No | Resolution of the generated image (options: 1K | 2K | 4K) (default: 1K) |
| output_format | string | No | Format of the output image (options: png | jpg) (default: png) |

### Request example

```json
{
  "modelId": "nano-banana-pro",
  "input": {
    "prompt": "A photorealistic portrait of a red fox in a snowy forest, soft morning light, shallow depth of field, 85mm.",
    "image_input": [
      "https://example.com/input.jpg"
    ],
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "output_format": "png"
  }
}
```

### Response example

```json
{
  "taskId": "281e5b0…f39b9",
  "creditsCharged": 24
}
```

## Query Task

`GET https://you.bot/api/v1/task/{taskId}?model=nano-banana-pro`

When `state` is `success`, the output is in `resultUrls`: `{ "state": "success", "resultUrls": [ ... ] }`. (Text models return inline in the create response.)

## Error Codes

| Code | Description |
|------|-------------|
| 200 | Request successful |
| 400 | Invalid request parameters |
| 401 | Authentication failed, check API Key |
| 402 | Insufficient account balance |
| 422 | Parameter validation failed |
| 429 | Request rate limit exceeded |
| 500 | Internal server error |