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Open VSX Registry API vs OpenCorporates

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

APIOpen VSX Registry APINEW—OpenCorporatesNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limit10800 req/window · 10799 remainingUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Open VSX Registry API vs OpenCorporates: common questions

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

On our scheduled checks, OpenCorporates leads on measured uptime — Open VSX Registry API at —% versus OpenCorporates 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 OpenCorporates need an API key?

Open VSX Registry API needs no key, while OpenCorporates requires a free API key. If you want to start calling without signup, reach for Open VSX Registry API first.

Can I call Open VSX Registry API and OpenCorporates from the browser?

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

Are Open VSX Registry API and OpenCorporates free for commercial use?

Open VSX Registry API has unclear commercial terms, and OpenCorporates 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.