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MarketAux vs Quandl

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

APIMarketAuxNEW—QuandlNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — token requiredFree — limits not published
Rate limit100 requests/day on free planUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

MarketAux vs Quandl: common questions

Which is more reliable, MarketAux or Quandl?

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

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

Can I call MarketAux and Quandl from the browser?

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

Are MarketAux and Quandl free for commercial use?

MarketAux has unclear commercial terms, and Quandl 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.