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Data.parliament.uk API vs Energy-Charts API

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

APIData.parliament.uk APIHEALTHY87Energy-Charts APIHEALTHY84
Uptime · 30d
Uptime · 90d93.9%97.2%
Uptime · 30d98.3%93.3%
P50 · ms534633
P95 · ms41643072
AuthapiKeynone
CORSyesyes
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

Data.parliament.uk API vs Energy-Charts API: common questions

Which is more reliable, Data.parliament.uk API or Energy-Charts API?

On our scheduled checks, Energy-Charts API leads on measured uptime — Data.parliament.uk API at 93.9% versus Energy-Charts API at 97.2% 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 Energy-Charts API?

Data.parliament.uk API has the lower median latency in our checks — Data.parliament.uk API responds in 534 ms versus Energy-Charts API at 633 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 Energy-Charts API need an API key?

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

Can I call Data.parliament.uk API and Energy-Charts API from the browser?

Yes — both Data.parliament.uk API and Energy-Charts API send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Data.parliament.uk API and Energy-Charts API free for commercial use?

Data.parliament.uk API has unclear commercial terms, and Energy-Charts 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.