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Free Dictionary API vs MarketAux

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

APIFree Dictionary APINEW—MarketAuxNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — token required
Rate limitUnpublished100 requests/day on free plan
In directory since2026-07-052026-07-05
operationalpartialdownno data

Free Dictionary API vs MarketAux: common questions

Which is more reliable, Free Dictionary API or MarketAux?

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

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

Can I call Free Dictionary API and MarketAux from the browser?

Yes — both Free Dictionary API and MarketAux 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 Free Dictionary API and MarketAux free for commercial use?

Free Dictionary API has unclear commercial terms, and MarketAux 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.