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Data.parliament.uk API vs Registrum API

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

APIData.parliament.uk APIHEALTHY84Registrum APIHEALTHY96
Uptime · 30d
Uptime · 90d92.2%100%
Uptime · 30d91.7%100%
P50 · ms678246
P95 · ms41641553
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Data.parliament.uk API vs Registrum API: common questions

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

On our scheduled checks, Registrum API leads on measured uptime — Data.parliament.uk API at 92.2% versus Registrum API 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 Registrum API?

Registrum API has the lower median latency in our checks — Data.parliament.uk API responds in 678 ms versus Registrum API at 246 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 Registrum API need an API key?

Both ask you to authenticate — Data.parliament.uk API uses an API key and Registrum API uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

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

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

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

Data.parliament.uk API has unclear commercial terms, and Registrum 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.