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Data.parliament.uk API vs REST Countries

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

APIData.parliament.uk APIHEALTHY84REST CountriesHEALTHY96
Uptime · 30d
Uptime · 90d92.2%100%
Uptime · 30d91.7%100%
P50 · ms678328
P95 · ms41641189
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedMPL-2.0
Free tierFree tier — API key requiredUnlimited
Rate limitUnpublishedNone published
In directory since2026-07-052026-05-02
operationalpartialdownno data

Data.parliament.uk API vs REST Countries: common questions

Which is more reliable, Data.parliament.uk API or REST Countries?

On our scheduled checks, REST Countries leads on measured uptime — Data.parliament.uk API at 92.2% versus REST Countries at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Data.parliament.uk API or REST Countries?

REST Countries has the lower median latency in our checks — Data.parliament.uk API responds in 678 ms versus REST Countries at 328 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 Data.parliament.uk API and REST Countries need an API key?

REST Countries needs no key, while Data.parliament.uk API requires a free API key. If you want to start calling without signup, reach for REST Countries first.

Can I call Data.parliament.uk API and REST Countries from the browser?

Only Data.parliament.uk API is browser-friendly — it returns CORS headers over HTTPS. REST Countries needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Data.parliament.uk API and REST Countries free for commercial use?

Data.parliament.uk API has unclear commercial terms, and REST Countries allows commercial use on its free tier. 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.