# 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**: 5.9 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 we POST the finished task to. Signed with `X-Webhook-Signature` once you create a webhook signing key in Dashboard → Settings |

### input object parameters

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| prompt | string | Yes | A text description of the image you want to generate Max 4000 characters. (example: Create a premium 1:1 product hero image for social commerce by compositing the uploaded photos. Place the product from the first image on a sunlit pale-marble… — full value in the request example) |
| 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) |

### Request example

```json
{
  "modelId": "nano-banana-pro",
  "input": {
    "prompt": "Create a premium 1:1 product hero image for social commerce by compositing the uploaded photos. Place the product from the first image on a sunlit pale-marble surface and keep its label text and proportions exactly as uploaded. Soft window light from the left, gentle falloff, one crisp shadow. Muted sage backdrop, a single small ceramic prop for scale, shallow depth of field. Ultra-clean commercial retouching, true-to-life colour, visible material texture. No logos other than the product's own, no watermark, no added text, no people.",
    "image_input": [
      "https://you.bot/examples/grok-imagine-text-to-image.jpg"
    ],
    "aspect_ratio": "1:1",
    "resolution": "1K"
  }
}
```

### Response example

```json
{
  "taskId": "281e5b0…f39b9",
  "creditsCharged": 5.9
}
```

## 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 |
| 403 | IP not allowed for this key, or the key is restricted to other models |
| 404 | Task not found, or it has expired |
| 409 | Duplicate request — an identical submit arrived moments ago. Nothing was charged; retry is safe |
| 413 | Payload too large — see the character and file-size limits for this model |
| 429 | Rate limit exceeded — retry after the Retry-After header |
| 500 | Internal server error |
| 504 | Upstream timed out — nothing was delivered; retry is safe |