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Data.parliament.uk API vs HOL Registry Broker

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

APIData.parliament.uk APIHEALTHY84HOL Registry BrokerHEALTHY94
Uptime · 30d
Uptime · 90d92.2%99.02%
Uptime · 30d91.7%100%
P50 · ms678386
P95 · ms4164913
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 HOL Registry Broker: common questions

Which is more reliable, Data.parliament.uk API or HOL Registry Broker?

On our scheduled checks, HOL Registry Broker leads on measured uptime — Data.parliament.uk API at 92.2% versus HOL Registry Broker at 99.02% 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 HOL Registry Broker?

HOL Registry Broker has the lower median latency in our checks — Data.parliament.uk API responds in 678 ms versus HOL Registry Broker at 386 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 HOL Registry Broker need an API key?

Both ask you to authenticate — Data.parliament.uk API uses an API key and HOL Registry Broker 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 HOL Registry Broker from the browser?

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

Are Data.parliament.uk API and HOL Registry Broker free for commercial use?

Data.parliament.uk API has unclear commercial terms, and HOL Registry Broker 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.