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Energy-Charts API vs The Guardian

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

APIEnergy-Charts APINEW—The GuardianNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree developer key — registration required
Rate limitUnpublished5000 calls/day (developer tier)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Energy-Charts API vs The Guardian: common questions

Which is more reliable, Energy-Charts API or The Guardian?

On our scheduled checks, The Guardian leads on measured uptime — Energy-Charts API at —% versus The Guardian at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Energy-Charts API and The Guardian need an API key?

Energy-Charts API needs no key, while The Guardian 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 The Guardian from the browser?

Yes — both Energy-Charts API and The Guardian 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 Energy-Charts API and The Guardian free for commercial use?

Energy-Charts API has unclear commercial terms, and The Guardian 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.