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ES·pera API vs openFDA API

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

APIES·pera APIDYING37openFDA APIHEALTHY93
Uptime · 30d
Uptime · 90d0.0%100%
Uptime · 30d0.0%100%
P50 · ms—305
P95 · ms—1868
Authnonenone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified
Free tierFree — limits not published
Rate limitUnpublished
In directory since2026-09-212026-07-05
operationalpartialdownno data

ES·pera API vs openFDA API: common questions

Which is more reliable, ES·pera API or openFDA API?

On our scheduled checks, openFDA API leads on measured uptime — ES·pera API at 0.0% versus openFDA 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 ES·pera API and openFDA API need an API key?

Neither needs a paid key — ES·pera API is callable with no signup, and openFDA API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call ES·pera API and openFDA API from the browser?

Neither sends browser-friendly CORS headers reliably, so call ES·pera API and openFDA API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are ES·pera API and openFDA API free for commercial use?

ES·pera API has unclear commercial terms, and openFDA 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.