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ExchangeRate-API (open) vs TaxID

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

APIExchangeRate-API (open)NEW—TaxIDNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ExchangeRate-API (open) vs TaxID: common questions

Which is more reliable, ExchangeRate-API (open) or TaxID?

On our scheduled checks, TaxID leads on measured uptime — ExchangeRate-API (open) at —% versus TaxID at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do ExchangeRate-API (open) and TaxID need an API key?

ExchangeRate-API (open) needs no key, while TaxID requires a free API key. If you want to start calling without signup, reach for ExchangeRate-API (open) first.

Can I call ExchangeRate-API (open) and TaxID from the browser?

Only ExchangeRate-API (open) is browser-friendly — it returns CORS headers over HTTPS. TaxID needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are ExchangeRate-API (open) and TaxID free for commercial use?

ExchangeRate-API (open) has unclear commercial terms, and TaxID has unclear commercial terms. 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.