Would you use funded keys for your SaaS Apps?

Hey everyone! I wanted to share a simplified auth strategy (which I am calling Funded Keys) that I've implemented in my SaaS app. Instead of traditional auth methods, users can fund a key, similar to developer API keys, to track usage and monetize the app. It's perfect for simple apps that require user tracking without building an entire auth flow. I'd love to hear your thoughts and opinions on this approach!