How to Cache Exchange Rates and Avoid Rate Limit...

You integrated an exchange rate API, deployed to production, and then hit HTTP 429: Rate limit exceeded. This is the most common operational issue developers face with exchange rate APIs — and it is entirely preventable with proper caching. Why You Need to Cache Exchange Rates Exchange rates don't change every millisecond. Even "real-time" APIs like AllRatesToday update every 60 seconds. Fetching the same rate on every page load is wasteful and will quickly exhaust your quota. Consider a simple