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MarketAux vs xAI Grok API

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

APIMarketAuxDEAD0xAI Grok APIDEAD0
Uptime · 30d
Uptime · 90d0.0%0.0%
Uptime · 30d0.0%0.0%
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 xAI Grok API: common questions

Which is more reliable, MarketAux or xAI Grok API?

Both are neck-and-neck — MarketAux and xAI Grok API each measure 0.0% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Do MarketAux and xAI Grok API need an API key?

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

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

Are MarketAux and xAI Grok API free for commercial use?

MarketAux has unclear commercial terms, and xAI Grok 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.