How I Fixed Stale Exchange Rate Data on Weekends With a Simple Python Filter

If you’ve ever built a forex monitor, trading alert system, or real‑time currency dashboard, you’ve almost certainly run into this annoying problem: Your real‑time rate API keeps sending data on weekends… but it’s just the same stale closing price from Friday. The WebSocket stays alive, timestamps keep updating, and your system thinks it’s getting fresh data. But the market is closed. This “fake data” triggers false alerts, pollutes your logic, wastes resources, and causes unnecessary headaches.