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MarketAux vs Registrum API

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

APIMarketAuxNEW—Registrum APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — token requiredFree tier — API key required
Rate limit100 requests/day on free planUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

MarketAux vs Registrum API: common questions

Which is more reliable, MarketAux or Registrum API?

On our scheduled checks, Registrum API leads on measured uptime — MarketAux at —% versus Registrum API 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 MarketAux and Registrum API need an API key?

Both ask you to authenticate — MarketAux uses an API key and Registrum API 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 MarketAux and Registrum API from the browser?

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

Are MarketAux and Registrum API free for commercial use?

MarketAux has unclear commercial terms, and Registrum 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.