Your AI app is silently burning $2,000/month and you don't know it. Here are the 5 patterns that bite founders.

Disclosure: I'm a senior backend tech lead and I run HostingGuru, where built-in AI monitoring is the feature I'm proudest of. This article will mention HostingGuru once at the end, but the patterns and detection methods below work on any platform - I want this useful even if you never become a customer. The cleanest version of this story is one I keep hearing from founders, with small variations each time: "We woke up to a $2,400 OpenAI bill. The product still works. Sentry is green. Our error rate is normal. We have no idea what happened." Then they dig in.