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Exchange Rates API vs TaxID

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

APIExchange Rates APIHEALTHY88TaxIDHEALTHY89
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms810729
P95 · ms41621556
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

Exchange Rates API vs TaxID: common questions

Which is more reliable, Exchange Rates API or TaxID?

Both are neck-and-neck — Exchange Rates API and TaxID each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Exchange Rates API or TaxID?

TaxID has the lower median latency in our checks — Exchange Rates API responds in 810 ms versus TaxID at 729 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

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?

Only Exchange Rates API 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 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.