Built and shipped a few production APIs solo over the past couple years. Here's what actually took products down — and none of it was "the code was bad."

1. Silent degradation, not hard crashes.

Your API doesn't go from 200ms to 500 error. It goes from 200ms to 4 seconds, quietly, over a week. Users churn before you even get an alert because most "uptime monitors" only ping for 200 vs non-200. You need latency percentile tracking, not just status codes.

2. Auth endpoints are the #1 attack surface, and nobody audits them after launch.

You hardened your login flow once at launch. Six months later you've shipped 40 PRs touching that same route. Rate limiting quietly broke. A header stopped being validated. Nobody re-audits unless something already went wrong.

3. Incident response with no context = 2am panic, not a fix.

Getting paged that something's down is useless without why. "Error rate spiked" tells you nothing. You need the diff between what changed and what broke.

This is exactly the gap I built APIGuardian to close — real-time monitoring that tracks degradation (not just uptime), automated recurring security audits on your endpoints, and AI-generated remediation notes when something breaks, so incident response isn't just vibes at 2am.

If you're running production APIs solo, this is worth having even if you don't use my tool — just start tracking p95 latency and re-audit your auth routes quarterly. It'll save you a bad night.