How to Handle API Rate Limits Before They Break Your Production Integration

You didn't hit an API rate limit because you missed the docs — you hit it because the free tier worked perfectly in testing, and nobody told you about the burst limit you'd blow through on your first real batch. The Problem The integration looked perfect. You built it against the sandbox, validated every edge case, and shipped it to production. Then real users arrived. Within hours, your logs filled with 429 errors. Jobs failed silently. User-facing features went dark. Your support inbox started filling up while you were asleep. This is the exact moment thousands of developers describe in the same words: "I built the whole thing against the free tier and it worked perfectly — then in production with real data it started throwing 429s everywhere and I had no retry logic." The free tier worked. The paid tier broke. That's not a coincidence. Why It Happens Most API documentation shows a headline rate limit — calls per minute, requests per day. What it doesn't show prominently: Burst limit