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Open VSX Registry API vs Quandl

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

APIOpen VSX Registry APIHEALTHY95QuandlHEALTHY88
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms245823
P95 · ms6933525
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?

Both are neck-and-neck — Open VSX Registry API and Quandl each measure 100% 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, Open VSX Registry API or Quandl?

Open VSX Registry API has the lower median latency in our checks — Open VSX Registry API responds in 245 ms versus Quandl at 823 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 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.