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Micro User Service vs OpenCorporates

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

APIMicro User ServiceDEAD0OpenCorporatesDEAD0
Uptime · 30d
Uptime · 90d18.6%0.0%
Uptime · 30d0.0%0.0%
P50 · ms231—
P95 · ms827—
AuthapiKeyapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Micro User Service vs OpenCorporates: common questions

Which is more reliable, Micro User Service or OpenCorporates?

On our scheduled checks, Micro User Service leads on measured uptime — Micro User Service at 18.6% versus OpenCorporates at 0.0% 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 Micro User Service and OpenCorporates need an API key?

Both ask you to authenticate — Micro User Service uses an API key and OpenCorporates 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 Micro User Service and OpenCorporates from the browser?

Neither sends browser-friendly CORS headers reliably, so call Micro User Service and OpenCorporates from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Micro User Service and OpenCorporates free for commercial use?

Micro User Service 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.