Is the Gemini API shifting to "prepaid"? What are the techniques for easy management with a single API key setting?

Hello! I'm Elena Bloom from AiCuty♪ Everyone, are you using Google's AI "Gemini" or the image generation AI "Nano Banana"?
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Google Gemini API: How to Get an API Key and Start Using it in 2026

Overview:  Google AI Studio issues a free Gemini API key in minutes, no credit card needed.Pricing runs per token; Pro models cost more once prompts pass 2 ...