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Nationalize.io vs Poptin API

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

APINationalize.ioHEALTHY95Poptin APIREACHABLE100
Uptime · 30d
Uptime · 90d98.9%100%
Uptime · 30d100%100%
P50 · ms209698
P95 · ms9851705
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified
Free tierKeyless usage limited (x-rate-limit-limit: 25 observed); 2,500 names/mo with a free key
Rate limitKeyless cap 25 per x-rate-limit-limit header; remaining/reset exposed in response headers120 req/window · 119 remaining
In directory since2026-07-052026-10-04
operationalpartialdownno data

Nationalize.io vs Poptin API: common questions

Which is more reliable, Nationalize.io or Poptin API?

On our scheduled checks, Poptin API leads on measured uptime — Nationalize.io at 98.9% versus Poptin 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.

Which is faster, Nationalize.io or Poptin API?

Nationalize.io has the lower median latency in our checks — Nationalize.io responds in 209 ms versus Poptin API at 698 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Nationalize.io and Poptin API need an API key?

Nationalize.io needs no key, while Poptin API requires a free API key. If you want to start calling without signup, reach for Nationalize.io first.

Can I call Nationalize.io and Poptin API from the browser?

Yes — both Nationalize.io and Poptin API 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 Nationalize.io and Poptin API free for commercial use?

Nationalize.io has unclear commercial terms, and Poptin 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.