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Lookup.im API vs MarketAux

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

APILookup.im APINEW—MarketAuxNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — token required
Rate limitUnpublished100 requests/day on free plan
In directory since2026-07-052026-07-05
operationalpartialdownno data

Lookup.im API vs MarketAux: common questions

Which is more reliable, Lookup.im API or MarketAux?

On our scheduled checks, MarketAux leads on measured uptime — Lookup.im 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 Lookup.im API and MarketAux need an API key?

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

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

Are Lookup.im API and MarketAux free for commercial use?

Lookup.im 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.