Exposed Gemini API Key Costs Developer Hundreds of Dollars, Shuts Down AI App

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A solo developer's AI language-learning app, RadioShadow, was suspended overnight after an exposed Gemini API key was scraped by an unauthorized bot within minutes of a deployment. The bot ran high-frequency automated requests that racked up nearly HK$300 in charges in a single day, triggering Google's automated security systems to freeze the entire project. The developer responded by deleting the compromised key, routing all AI calls through server-side Next.js route handlers with rate limiting, and setting up strict billing alerts. RadioShadow is a web app that helps language learners overcome the intermediate plateau by combining live global radio streams with real-time AI transcription, translation, and pronunciation feedback. The incident highlights a critical security lesson: API keys should never be exposed in client-facing code, even temporarily during testing.

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ProgrammingDEV Community ·

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