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Open VSX Registry API vs Quandl

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

APIOpen VSX Registry 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 limit10800 req/window · 10799 remainingUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Open VSX Registry API vs Quandl: common questions

Which is more reliable, Open VSX Registry API or Quandl?

On our scheduled checks, Quandl leads on measured uptime — Open VSX Registry 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 Open VSX Registry API and Quandl need an API key?

Neither needs a paid key — Open VSX Registry 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 Open VSX Registry API and Quandl from the browser?

Only Open VSX Registry 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 Open VSX Registry API and Quandl free for commercial use?

Open VSX Registry 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.