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Energy-Charts API vs HOL Registry Broker

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

APIEnergy-Charts APIHEALTHY81HOL Registry BrokerHEALTHY94
Uptime · 30d
Uptime · 90d99.02%99.02%
Uptime · 30d98.3%100%
P50 · ms1178386
P95 · ms2855913
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Energy-Charts API vs HOL Registry Broker: common questions

Which is more reliable, Energy-Charts API or HOL Registry Broker?

Both are neck-and-neck — Energy-Charts API and HOL Registry Broker each measure 99.02% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Energy-Charts API or HOL Registry Broker?

HOL Registry Broker has the lower median latency in our checks — Energy-Charts API responds in 1178 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 Energy-Charts API and HOL Registry Broker need an API key?

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

Can I call Energy-Charts API and HOL Registry Broker from the browser?

Only Energy-Charts 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 Energy-Charts API and HOL Registry Broker free for commercial use?

Energy-Charts 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.