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OnSched Consumer API vs VatcheckAPI

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

APIOnSched Consumer APINEW—VatcheckAPINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

OnSched Consumer API vs VatcheckAPI: common questions

Which is more reliable, OnSched Consumer API or VatcheckAPI?

On our scheduled checks, VatcheckAPI leads on measured uptime — OnSched Consumer API at —% versus VatcheckAPI 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 OnSched Consumer API and VatcheckAPI need an API key?

Both ask you to authenticate — OnSched Consumer API uses an API key and VatcheckAPI uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call OnSched Consumer API and VatcheckAPI from the browser?

Yes — both OnSched Consumer API and VatcheckAPI 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 OnSched Consumer API and VatcheckAPI free for commercial use?

OnSched Consumer API has unclear commercial terms, and VatcheckAPI 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.