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Energy-Charts API vs Quandl

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

APIEnergy-Charts APINEW—QuandlNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Energy-Charts API vs Quandl: common questions

Which is more reliable, Energy-Charts API or Quandl?

On our scheduled checks, Quandl leads on measured uptime — Energy-Charts API at —% versus Quandl 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 Quandl need an API key?

Neither needs a paid key — Energy-Charts API is callable with no signup, and Quandl is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Energy-Charts API and Quandl from the browser?

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

Are Energy-Charts API and Quandl free for commercial use?

Energy-Charts API has unclear commercial terms, and Quandl 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.