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Exchangerate.host vs GOV.UK Pay API

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

APIExchangerate.hostNEW—GOV.UK Pay APINEW—
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 — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Exchangerate.host vs GOV.UK Pay API: common questions

Which is more reliable, Exchangerate.host or GOV.UK Pay API?

On our scheduled checks, GOV.UK Pay API leads on measured uptime — Exchangerate.host at —% versus GOV.UK Pay API 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.host and GOV.UK Pay API need an API key?

Exchangerate.host needs no key, while GOV.UK Pay API requires a free API key. If you want to start calling without signup, reach for Exchangerate.host first.

Can I call Exchangerate.host and GOV.UK Pay API from the browser?

Only Exchangerate.host is browser-friendly — it returns CORS headers over HTTPS. GOV.UK Pay API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Exchangerate.host and GOV.UK Pay API free for commercial use?

Exchangerate.host has unclear commercial terms, and GOV.UK Pay API 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.