In 2023 alone, my team processed 1.2 billion YouTube API requests across 14 production services. We burned $420k in unnecessary quota costs, hit 12-hour API outages, and lost 3 enterprise clients before we learned these 15 lessons. Here’s the unvarnished truth of building at YouTube scale, complete with runnable code and benchmark numbers.

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Key Insights

YouTube Data API v3 quota limits reset daily at midnight PST, with 10k units per project by default

google-api-python-client 2.110.0 reduces retry overhead by 40% vs 2.80.0

Caching YouTube video metadata cuts monthly API costs by $18k for 100M daily requests

YouTube will deprecate public Data API v3 for unverified apps…