Nano Banana Pro (Gemini 3 Pro Image) API - RouterBase

Overview

Nano Banana Pro (Gemini 3 Pro Image) is Google’s flagship image model, available on RouterBase. It produces up to 4K-resolution visuals with photo-real lighting, accurate typography, and precise prompt adherence, plus natural-language image editing with up to 14 reference images.


Provider	Google
Family	`gemini-3-pro-image`
Modality	Image
Supported tasks	`text-to-image`, `edit`

Endpoint

POST https://routerbase.com/v1/images/generations

Playground

Try it live without writing code:

Supported Tasks

Each task has its own reference page with full parameter docs and examples:

Authentication

All requests require a Bearer token — create one at routerbase.com/api-key.

curl https://routerbase.com/v1/images/generations \
  -H "Authorization: Bearer $ROUTERBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "google/gemini-3-pro-image-t2i", "prompt": "…"}'