VIES VAT System Shows 98.71% Uptime, but Germany Drops to 84% in 5-Day Study

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A sampling project monitored the EU's VIES VAT validation endpoint every 15 minutes across all 28 member state codes, collecting 15,344 total samples over a five-day window from August 6 to 11, 2026. While the aggregate availability across all states was 98.71%, individual country performance varied sharply, making the overall figure misleading for developers relying on specific national backends. Germany recorded the lowest availability at 83.94% with 88 missed samples, Latvia came in at 88.87%, and Ireland at 95.44%, while several countries including Austria, Bulgaria, and Spain maintained perfect uptime. The data is sourced from the European Commission's own check-status API, which reports each country's self-declared availability rather than results from independent probes. The study notes this five-day window is sufficient to identify repeating daily patterns but is not long enough to project annual uptime figures.

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