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MarketAux vs Open VSX Registry API

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

APIMarketAuxDEAD0Open VSX Registry APIHEALTHY95
Uptime · 30d
Uptime · 90d0.0%100%
Uptime · 30d0.0%100%
P50 · ms—245
P95 · ms—693
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — token requiredFree — limits not published
Rate limit100 requests/day on free plan10800 req/window · 10799 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

MarketAux vs Open VSX Registry API: common questions

Which is more reliable, MarketAux or Open VSX Registry API?

On our scheduled checks, Open VSX Registry API leads on measured uptime — MarketAux at 0.0% versus Open VSX Registry API at 100% 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 Open VSX Registry API need an API key?

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

Can I call MarketAux and Open VSX Registry API from the browser?

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

Are MarketAux and Open VSX Registry API free for commercial use?

MarketAux has unclear commercial terms, and Open VSX Registry 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.