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Open VSX Registry API vs The Odds API

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

APIOpen VSX Registry APIHEALTHY95The Odds APIREACHABLE100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms245225
P95 · ms6932101
AuthnoneapiKey
CORSyesyes
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 The Odds API: common questions

Which is more reliable, Open VSX Registry API or The Odds API?

Both are neck-and-neck — Open VSX Registry API and The Odds API 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 The Odds API?

The Odds API has the lower median latency in our checks — Open VSX Registry API responds in 245 ms versus The Odds API at 225 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 The Odds API need an API key?

Open VSX Registry API needs no key, while The Odds API 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 The Odds API from the browser?

Yes — both Open VSX Registry API and The Odds API 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 Open VSX Registry API and The Odds API free for commercial use?

Open VSX Registry API has unclear commercial terms, and The Odds API 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.