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ONS vs OpenMercantil

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

APIONSNEW—OpenMercantilNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — anonymous, no key
Rate limitUnpublished60 req/min, 200 req/day per IP (anonymous)
In directory since2026-07-052026-07-05
operationalpartialdownno data

ONS vs OpenMercantil: common questions

Which is more reliable, ONS or OpenMercantil?

On our scheduled checks, OpenMercantil leads on measured uptime — ONS at —% versus OpenMercantil 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 ONS and OpenMercantil need an API key?

Neither needs a paid key — ONS is callable with no signup, and OpenMercantil is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call ONS and OpenMercantil from the browser?

Yes — both ONS and OpenMercantil 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 ONS and OpenMercantil free for commercial use?

ONS has unclear commercial terms, and OpenMercantil 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.