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GOV.UK Pay API vs PredScope

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

APIGOV.UK Pay APINEW—PredScopeNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

GOV.UK Pay API vs PredScope: common questions

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

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

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

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

Only PredScope 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 GOV.UK Pay API and PredScope free for commercial use?

GOV.UK Pay API has unclear commercial terms, and PredScope 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.