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Bill Payment Validator vs Frankfurter

Same instrument, two spec sheets — measured, not claimed.

APIBill Payment ValidatorUNMONITORED—FrankfurterHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedPublic data (ECB reference rates)
Free tierFree — limits not publishedUnlimited — abuse-rate-limited only
Rate limitUnpublishedUnpublished, generous
In directory since2026-07-052026-05-02
operationalpartialdownno data

Bill Payment Validator vs Frankfurter: common questions

Which is more reliable, Bill Payment Validator or Frankfurter?

Only Frankfurter is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do Bill Payment Validator and Frankfurter need an API key?

Neither needs a paid key — Bill Payment Validator is callable with no signup, and Frankfurter is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Bill Payment Validator and Frankfurter from the browser?

Only Frankfurter is browser-friendly — it returns CORS headers over HTTPS. Bill Payment Validator needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Bill Payment Validator and Frankfurter free for commercial use?

Bill Payment Validator has unclear commercial terms, and Frankfurter allows commercial use on its free tier. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.