# Nano Banana 2.1 API

Google Gemini image model: consistent multi-reference editing, 1K–4K output.

Base URL: https://01router.com/api/v1
Model ID: nano-banana-2.1
Documentation: https://01router.com/gateway/nano-banana-2.1#api

## Quick start

Set API_KEY to your project key, then run a sample from your server. Replace example media URLs with your own public URLs.

```bash
export API_KEY="YOUR_API_KEY"
curl "https://01router.com/api/v1/generations" \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'JSON'
{
  "model": "nano-banana-2.1",
  "input": {
    "prompt": "A cinematic shot of a red fox running through snow",
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "num_images": 1
  }
}
JSON
```

## Endpoints

| Method | Path | Authentication | Description |
| --- | --- | --- | --- |
| POST | /api/v1/generations | API key required | Create a generation (charges credits) |
| GET | /api/v1/generations/{id} | API key required | Get a generation; polls the provider while running |
| POST | /api/v1/generations/{id}/cancel | API key required | Cancel a running generation (credits refunded) |
| POST | /api/v1/quote | Public · no key | Price a request on every provider (no charge, no key needed) |
| POST | /api/v1/images/generations | API key required | OpenAI-compatible image generation (waits for the result) |
| GET | /api/v1/models/nano-banana-2.1 | Public · no key | Get one model |

## Authentication

Send your API key as a Bearer token. Requests are billed to the key owner's credits.

`Authorization: Bearer <API_KEY>`

## Input

Send JSON with Content-Type: application/json. Model parameters belong inside input; model, provider and callback_url are top-level fields.

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| model | string | Yes | "nano-banana-2.1" |
| provider | string | No | Pin a provider; omit to auto-route to the cheapest. One of: fal \| 01router \| replicate \| wavespeed \| kie \| evolink \| atlascloud \| openrouter |
| input | object | Yes | Model parameters, see the input fields below. |
| callback_url | string | No | Optional public HTTPS webhook URL. The final task result is signed and delivered here; polling remains available. |

### input

Required fields are marked explicitly. Other fields use the listed defaults when omitted.

| Name | Type | Required | Description | Default |
| --- | --- | --- | --- | --- |
| input.prompt | string | Yes | Prompt | — |
| input.image_urls | string[] | No | Optional — switches to image editing; maxItems: 14 | — |
| input.aspect_ratio | string | No | Aspect ratio; options: ["1:1","16:9","9:16","4:3","3:4","3:2","2:3","4:5","5:4","21:9"] | "1:1" |
| input.resolution | string | No | Resolution; options: ["1K","2K","4K"] | "1K" |
| input.num_images | integer | No | Images; min: 1; max: 4 | 1 |

Auto-routing chooses a provider that supports the request. Select a provider to see its input constraints and pinned request examples.

### Provider input schemas

```json
[
  {
    "provider": "fal",
    "params": [
      {
        "name": "prompt",
        "type": "text",
        "label": "Prompt",
        "required": true
      },
      {
        "name": "image_urls",
        "type": "images",
        "label": "Reference images",
        "description": "Optional — switches to image editing",
        "maxItems": 14
      },
      {
        "name": "aspect_ratio",
        "type": "enum",
        "label": "Aspect ratio",
        "options": [
          "1:1",
          "16:9",
          "9:16",
          "4:3",
          "3:4",
          "3:2",
          "2:3",
          "4:5",
          "5:4",
          "21:9"
        ],
        "default": "1:1"
      },
      {
        "name": "resolution",
        "type": "enum",
        "label": "Resolution",
        "options": [
          "1K",
          "2K",
          "4K"
        ],
        "default": "1K"
      },
      {
        "name": "num_images",
        "type": "integer",
        "label": "Images",
        "min": 1,
        "max": 4,
        "default": 1
      }
    ]
  },
  {
    "provider": "01router",
    "params": [
      {
        "name": "prompt",
        "type": "text",
        "label": "Prompt",
        "required": true
      },
      {
        "name": "image_urls",
        "type": "images",
        "label": "Reference images",
        "description": "Optional — switches to image editing",
        "maxItems": 14
      },
      {
        "name": "aspect_ratio",
        "type": "enum",
        "label": "Aspect ratio",
        "options": [
          "1:1",
          "16:9",
          "9:16",
          "4:3",
          "3:4",
          "3:2",
          "2:3",
          "4:5",
          "5:4",
          "21:9"
        ],
        "default": "1:1"
      },
      {
        "name": "resolution",
        "type": "enum",
        "label": "Resolution",
        "options": [
          "1K",
          "2K",
          "4K"
        ],
        "default": "1K"
      },
      {
        "name": "num_images",
        "type": "integer",
        "label": "Images",
        "min": 1,
        "max": 4,
        "default": 1
      }
    ]
  },
  {
    "provider": "replicate",
    "params": [
      {
        "name": "prompt",
        "type": "text",
        "label": "Prompt",
        "required": true
      },
      {
        "name": "image_urls",
        "type": "images",
        "label": "Reference images",
        "description": "Optional — switches to image editing",
        "maxItems": 14
      },
      {
        "name": "aspect_ratio",
        "type": "enum",
        "label": "Aspect ratio",
        "options": [
          "1:1",
          "16:9",
          "9:16",
          "4:3",
          "3:4",
          "3:2",
          "2:3",
          "4:5",
          "5:4",
          "21:9"
        ],
        "default": "1:1"
      },
      {
        "name": "resolution",
        "type": "enum",
        "label": "Resolution",
        "options": [
          "1K",
          "2K",
          "4K"
        ],
        "default": "1K"
      },
      {
        "name": "num_images",
        "type": "integer",
        "label": "Images",
        "min": 1,
        "max": 4,
        "default": 1,
        "options": [
          1
        ]
      }
    ]
  },
  {
    "provider": "wavespeed",
    "params": [
      {
        "name": "prompt",
        "type": "text",
        "label": "Prompt",
        "required": true
      },
      {
        "name": "image_urls",
        "type": "images",
        "label": "Reference images",
        "description": "Optional — switches to image editing",
        "maxItems": 14
      },
      {
        "name": "aspect_ratio",
        "type": "enum",
        "label": "Aspect ratio",
        "options": [
          "1:1",
          "16:9",
          "9:16",
          "4:3",
          "3:4",
          "3:2",
          "2:3",
          "4:5",
          "5:4",
          "21:9"
        ],
        "default": "1:1"
      },
      {
        "name": "resolution",
        "type": "enum",
        "label": "Resolution",
        "options": [
          "1K",
          "2K",
          "4K"
        ],
        "default": "1K"
      },
      {
        "name": "num_images",
        "type": "integer",
        "label": "Images",
        "min": 1,
        "max": 4,
        "default": 1,
        "options": [
          1
        ]
      }
    ]
  },
  {
    "provider": "kie",
    "params": [
      {
        "name": "prompt",
        "type": "text",
        "label": "Prompt",
        "required": true
      },
      {
        "name": "image_urls",
        "type": "images",
        "label": "Reference images",
        "description": "Optional — switches to image editing",
        "maxItems": 14
      },
      {
        "name": "aspect_ratio",
        "type": "enum",
        "label": "Aspect ratio",
        "options": [
          "1:1",
          "16:9",
          "9:16",
          "4:3",
          "3:4",
          "3:2",
          "2:3",
          "4:5",
          "5:4",
          "21:9"
        ],
        "default": "1:1"
      },
      {
        "name": "resolution",
        "type": "enum",
        "label": "Resolution",
        "options": [
          "1K",
          "2K",
          "4K"
        ],
        "default": "1K"
      },
      {
        "name": "num_images",
        "type": "integer",
        "label": "Images",
        "min": 1,
        "max": 4,
        "default": 1,
        "options": [
          1
        ]
      }
    ]
  },
  {
    "provider": "evolink",
    "params": [
      {
        "name": "prompt",
        "type": "text",
        "label": "Prompt",
        "required": true
      },
      {
        "name": "image_urls",
        "type": "images",
        "label": "Reference images",
        "description": "Optional — switches to image editing",
        "maxItems": 14
      },
      {
        "name": "aspect_ratio",
        "type": "enum",
        "label": "Aspect ratio",
        "options": [
          "1:1",
          "16:9",
          "9:16",
          "4:3",
          "3:4",
          "3:2",
          "2:3",
          "4:5",
          "5:4",
          "21:9"
        ],
        "default": "1:1"
      },
      {
        "name": "resolution",
        "type": "enum",
        "label": "Resolution",
        "options": [
          "1K",
          "2K",
          "4K"
        ],
        "default": "1K"
      },
      {
        "name": "num_images",
        "type": "integer",
        "label": "Images",
        "min": 1,
        "max": 4,
        "default": 1,
        "options": [
          1
        ]
      }
    ]
  },
  {
    "provider": "atlascloud",
    "params": [
      {
        "name": "prompt",
        "type": "text",
        "label": "Prompt",
        "required": true
      },
      {
        "name": "image_urls",
        "type": "images",
        "label": "Reference images",
        "description": "Optional — switches to image editing",
        "maxItems": 14
      },
      {
        "name": "aspect_ratio",
        "type": "enum",
        "label": "Aspect ratio",
        "options": [
          "1:1",
          "16:9",
          "9:16",
          "4:3",
          "3:4",
          "3:2",
          "2:3",
          "4:5",
          "5:4",
          "21:9"
        ],
        "default": "1:1"
      },
      {
        "name": "resolution",
        "type": "enum",
        "label": "Resolution",
        "options": [
          "1K"
        ],
        "default": "1K"
      },
      {
        "name": "num_images",
        "type": "integer",
        "label": "Images",
        "min": 1,
        "max": 4,
        "default": 1,
        "options": [
          1
        ]
      }
    ]
  },
  {
    "provider": "openrouter",
    "params": [
      {
        "name": "prompt",
        "type": "text",
        "label": "Prompt",
        "required": true
      },
      {
        "name": "image_urls",
        "type": "images",
        "label": "Reference images",
        "description": "Optional — switches to image editing",
        "maxItems": 14
      },
      {
        "name": "aspect_ratio",
        "type": "enum",
        "label": "Aspect ratio",
        "options": [
          "1:1",
          "16:9",
          "9:16",
          "4:3",
          "3:4",
          "3:2",
          "2:3",
          "4:5",
          "5:4",
          "21:9"
        ],
        "default": "1:1"
      },
      {
        "name": "resolution",
        "type": "enum",
        "label": "Resolution",
        "options": [
          "1K",
          "2K",
          "4K"
        ],
        "default": "1K"
      },
      {
        "name": "num_images",
        "type": "integer",
        "label": "Images",
        "min": 1,
        "max": 4,
        "default": 1,
        "options": [
          1
        ]
      }
    ]
  }
]
```

## Output

Creating a task does not mean generation has finished. Keep its id, poll until succeeded or failed, then read outputs or error. Amounts below are illustrative; actual charges depend on the request.

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| id | string | Yes | Generation ID. Use it to query or cancel this task. |
| object | string | Yes | generation |
| model | string | Yes | nano-banana-2.1 |
| type | string | Yes | image |
| provider | string | Yes | Provider |
| status | string | Yes | queued → processing → succeeded / failed. Stop polling at either terminal state. |
| input | object | Yes | Model parameters, see the input fields below. |
| outputs | string[] | Yes | Result URLs. Empty while processing; read after succeeded and save the files promptly. |
| error | string \| null | Yes | Failure reason, or null when no failure is reported. |
| credits | number | Yes | Credits charged for this request. |
| price_usd | number | Yes | Request price in USD. |
| created_at | string | Yes | Creation time in ISO 8601 format. |
| completed_at | string \| null | Yes | Completion time in ISO 8601 format; null before completion. |

### Task submitted

```json
{
  "id": "gen_example",
  "object": "generation",
  "model": "nano-banana-2.1",
  "type": "image",
  "provider": "fal",
  "status": "processing",
  "input": {
    "prompt": "A cinematic shot of a red fox running through snow",
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "num_images": 1
  },
  "outputs": [],
  "error": null,
  "credits": 0,
  "price_usd": 0,
  "created_at": "2026-10-25T08:00:00.000Z",
  "completed_at": null
}
```

### Task completed

```json
{
  "id": "gen_example",
  "object": "generation",
  "model": "nano-banana-2.1",
  "type": "image",
  "provider": "fal",
  "status": "succeeded",
  "input": {
    "prompt": "A cinematic shot of a red fox running through snow",
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "num_images": 1
  },
  "outputs": [
    "https://example.com/output.png"
  ],
  "error": null,
  "credits": 0,
  "price_usd": 0,
  "created_at": "2026-10-25T08:00:00.000Z",
  "completed_at": "2026-10-25T08:01:00.000Z"
}
```

## Get the result

Poll every few seconds until status is succeeded or failed. Output URLs are provider-hosted and may expire — download them promptly. Or pass callback_url to get the result pushed.

```bash
curl "https://01router.com/api/v1/generations/GENERATION_ID" -H "Authorization: Bearer $API_KEY"
```

## Cancel a task

Cancellation depends on provider support and task state. A confirmed cancellation returns status: failed and error: Canceled by user. Unsupported or completed tasks return 409 not_cancelable.

```bash
curl -X POST "https://01router.com/api/v1/generations/GENERATION_ID/cancel" -H "Authorization: Bearer $API_KEY"
```

## Quote

Same body as creating a generation. Returns every available provider sorted by price, plus the ones that cannot serve the request and why.

```bash
curl "https://01router.com/api/v1/quote" -H "Content-Type: application/json" --data-binary @- <<'JSON'
{
  "model": "nano-banana-2.1",
  "input": {
    "prompt": "A cinematic shot of a red fox running through snow",
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "num_images": 1
  }
}
JSON
```

## Callbacks

Optional public HTTPS webhook URL. The final task result is signed and delivered here; polling remains available.

See https://01router.com/docs/callback for signature verification.

## OpenAI-compatible images

For OpenAI SDK integrations, use this endpoint with top-level prompt. It waits for the result and returns data[].url. For asynchronous tasks and the full model parameter set, use /generations.

```json
{
  "model": "nano-banana-2.1",
  "prompt": "A cinematic shot of a red fox running through snow"
}
```

## Errors

Check the HTTP status and error.message. Fix the request before retrying validation or authentication errors. A failed generation is reported in status and error on the task itself.

```json
{
  "error": {
    "message": "Invalid or missing API key",
    "code": "unauthorized"
  }
}
```

HTTP 400: invalid request; 401: unauthorized; 402: insufficient credits; 404: not found; 409: not cancelable; 429: rate/concurrency/quota limit; 5xx: upstream/server error.

Full API reference: https://01router.com/docs/errors