Google: Nano Banana Pro (Text to Image) API Reference

About

Google's Nano Banana pro (Gemini 3.0 Pro Image) is a cutting-edge text-to-image model enabling high-res 4K image generation optimized for phones. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

1. Calling the API

Setup your API Key

To begin using Infron, you first need to create an account and generate your API Key.

Once you have your API key, set it as an environment variable in your runtime environment. This allows your applications to securely access Infron’s API.

export INFRON_KEY="YOUR_API_KEY"

Submit a request

For long-running requests, you can poll for results.

curl https://media.onerouter.pro/v1/images/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d @- <<'EOF'
{
  "model": "google/nano-banana-pro/text-to-image",
  "prompt": "An action shot of a black lab swimming in an inground suburban swimming pool. The camera is placed meticulously on the water line, dividing the image in half, revealing both the dogs head above water holding a tennis ball in it's mouth, and it's paws paddling underwater.",
  "n": 1,
  "aspect_ratio": "16:9",
  "resolution": "1K",
  "output_format": "png",
  "response_format": "url",
  "seed": 1,
  "enable_web_search": true
}
EOF

Response with queue task id

The response will look like this:

{
  "code": 200,
  "message": "success",
  "data": {
    "task_id": "2a7603f261b4414380cb1a6a607d7357",
    "object": "image",
    "model": "google/nano-banana-pro/text-to-image",
    "status": "created",
    "urls": {
      "query": "https://media.onerouter.pro/v1/images/tasks/2a7603f261b4414380cb1a6a607d7357"
    },
    "created_at": "2026-06-04 06:37:42.94"
  }
}

Fetch request status

You can fetch the status of a request to check if it is completed or still in progress.

curl https://media.onerouter.pro/v1/images/tasks/{task_id} \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" 

# For example
curl https://media.onerouter.pro/v1/images/tasks/2a7603f261b4414380cb1a6a607d7357 \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json"

Response with queue task status query

{
  "code": 200,
  "message": "success",
  "data": {
    "task_id": "2a7603f261b4414380cb1a6a607d7357",
    "object": "image",
    "model": "google/nano-banana-pro/text-to-image",
    "status": "in_progress",
    "fail_reason": "",
    "submit_time": 1780555063,
    "start_time": 1780555062,
    "finish_time": 0,
    "outputs": [],
    "created_at": "2026-06-04 06:37:43"
  }
}

Possible statuses:

created
in_progress
processing
completed
failed

created -> in_progress → processing → completed | failed

Poll every 1-2 seconds until status is "completed" or "failed"

Get the result (when status is "completed")

Once the request is completed, you can fetch the result. See the Output Schema for the expected result format.

{
  "code": 200,
  "message": "success",
  "data": {
    "task_id": "2a7603f261b4414380cb1a6a607d7357",
    "object": "image",
    "model": "google/nano-banana-pro/text-to-image",
    "status": "completed",
    "fail_reason": "",
    "submit_time": 1780555063,
    "start_time": 1780555062,
    "finish_time": 1780555110,
    "outputs": [
      "https://storage.googleapis.com/infron_gcs/image%2Fgemini_f0882eff-b63b-4229-a4b1-cc80714ada48.png"
    ],
    "usage": {
      "completion_tokens": 1441,
      "image_count": 1,
      "prompt_tokens": 57,
      "resolution": "1K",
      "total_tokens": 1498,
      "web_search": true
    },
    "cost": {
      "total_cost": 0.138366,
      "cost_details": {
        "prompt_cost": 0,
        "completion_cost": 0,
        "image_cost": 0.138366,
        "video_cost": 0,
        "audio_cost": 0,
        "native_web_search_cost": 0,
        "plugin_web_search_cost": 0,
        "tools_cost": 0,
        "prompt_cache_read_cost": 0,
        "prompt_cache_write_cost": 0,
        "prompt_cache_write_5_min": 0,
        "prompt_cache_write_1_h": 0,
        "reasoning_cost": 0,
        "discount_rate": 1,
        "is_byok": false,
        "byok_cost": 0
      }
    },
    "created_at": "2026-06-04 06:37:43"
  }
}

2. Schema

Input

Parameter	Type	Required	Default	Range	Description
model	string	Yes	--	Explore all models	Model name.
prompt	string	Yes	--	--	Text prompt for generation; Positive text prompt.
n	integer	No	`1`	==1	Number of images to generate.
aspect_ratio	string	No	--	`1:1`, `2:3`, `3:2`, `3:4`, `4:3`, `4:5`, `5:4`, `9:16`, `16:9`, `21:9`	Aspect ratio of the generated image.
resolution	string	No	`1K`	`1K`, `2K`, `4K`	Resolution of the generated image.
output_format	string	No	`png`	`png`, `jpeg`, `webp`	Output format for the images.
response_format	string	No	`url`	`url`, `b64_json`	URL or JSON string.
seed	integer	No	--	>=1	The random seed to use for the generation.
enablewebsearch	boolean	No	`False`	`true`, `false`	Enable web search.

Example request

curl https://media.onerouter.pro/v1/images/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d @- <<'EOF'
{
  "model": "google/nano-banana-pro/text-to-image",
  "prompt": "An action shot of a black lab swimming in an inground suburban swimming pool. The camera is placed meticulously on the water line, dividing the image in half, revealing both the dogs head above water holding a tennis ball in it's mouth, and it's paws paddling underwater.",
  "n": 1,
  "aspect_ratio": "16:9",
  "resolution": "1K",
  "output_format": "png",
  "response_format": "url",
  "seed": 1,
  "enable_web_search": true
}
EOF

Output

Parameter	Type	Range	Description
code	integer	--	Status code of the request.
message	string	--	Status message of the request.
data	object	--	Data of the task.
data.task_id	string	--	ID of the task.
data.object	string	--	Object type of the task.
data.model	string	--	Model name of the task.
data.status	string	`created`, `in_progress`, `processing`, `completed`, `failed`	Status of the task.
data.fail_reason	string	--	Fail reason of the task.
data.submit_time	integer	--	Timestamp of the task submission.
data.start_time	integer	--	Timestamp of the task start.
data.finish_time	integer	--	Timestamp of the task finish.
data.outputs	array	--	Outputs of the task.
data.created_at	string	--	Timestamp of the task creation.

Example output

{
  "code": 200,
  "message": "success",
  "data": {
    "task_id": "2a7603f261b4414380cb1a6a607d7357",
    "object": "image",
    "model": "google/nano-banana-pro/text-to-image",
    "status": "completed",
    "fail_reason": "",
    "submit_time": 1780555063,
    "start_time": 1780555062,
    "finish_time": 1780555110,
    "outputs": [
      "https://storage.googleapis.com/infron_gcs/image%2Fgemini_f0882eff-b63b-4229-a4b1-cc80714ada48.png"
    ],
    "usage": {
      "completion_tokens": 1441,
      "image_count": 1,
      "prompt_tokens": 57,
      "resolution": "1K",
      "total_tokens": 1498,
      "web_search": true
    },
    "cost": {
      "total_cost": 0.138366,
      "cost_details": {
        "prompt_cost": 0,
        "completion_cost": 0,
        "image_cost": 0.138366,
        "video_cost": 0,
        "audio_cost": 0,
        "native_web_search_cost": 0,
        "plugin_web_search_cost": 0,
        "tools_cost": 0,
        "prompt_cache_read_cost": 0,
        "prompt_cache_write_cost": 0,
        "prompt_cache_write_5_min": 0,
        "prompt_cache_write_1_h": 0,
        "reasoning_cost": 0,
        "discount_rate": 1,
        "is_byok": false,
        "byok_cost": 0
      }
    },
    "created_at": "2026-06-04 06:37:43"
  }
}

3. Detailed Pricing

Pricing Type	Unit	Price
Input text	1M tokens	$2.00
Input image	1M tokens	$2.00
Input image	1 image	~$0.0011
Output text / thinking	1M tokens	$12.00
Output image	1M tokens	$120.00

Resolution	Estimated Output Tokens	Estimated Price
1K / 1024×1024	1,120 tokens	$0.134
2K / 2048×2048	1,120 tokens	$0.134
4K / 4096×4096	2,000 tokens	$0.240