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Someone used $167 on my Anthropic API keys (limit was $30), and the key was never in my code. How could it leak?

I run a small SaaS, a WordPress plugin with an AI backend. This week I found that someone else had used my Anthropic API key. They ran $167 of usage, mostly Opus 5.5 and Fable requests , even though I had a $30 spend limit set. What I know one of the affected keys was an older key that was never co…

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  1. 2026-11-10 18:20 · r/ClaudeAI
    Someone used $167 on my Anthropic API keys (limit was $30), and the key was never in my code. How could it leak?

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