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CompanyData.com vs Marketstack

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

APICompanyData.comNEW—MarketstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

CompanyData.com vs Marketstack: common questions

Which is more reliable, CompanyData.com or Marketstack?

On our scheduled checks, Marketstack leads on measured uptime — CompanyData.com at —% versus Marketstack 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 CompanyData.com and Marketstack need an API key?

CompanyData.com needs no key, while Marketstack requires a free API key. If you want to start calling without signup, reach for CompanyData.com first.

Can I call CompanyData.com and Marketstack from the browser?

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

Are CompanyData.com and Marketstack free for commercial use?

CompanyData.com has unclear commercial terms, and Marketstack 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.