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Exchange Rates API vs TaxID

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

APIExchange Rates APINEW—TaxIDNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnono
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

Exchange Rates API vs TaxID: common questions

Which is more reliable, Exchange Rates API or TaxID?

On our scheduled checks, TaxID leads on measured uptime — Exchange Rates API 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 Exchange Rates API and TaxID need an API key?

Exchange Rates API needs no key, while TaxID requires a free API key. If you want to start calling without signup, reach for Exchange Rates API first.

Can I call Exchange Rates API and TaxID from the browser?

Neither sends browser-friendly CORS headers reliably, so call Exchange Rates API and TaxID from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Exchange Rates API and TaxID free for commercial use?

Exchange Rates API 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.