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Abstract Email Validation vs Nationalize.io

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

APIAbstract Email ValidationREACHABLE—Nationalize.ioNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — 100 requests/monthKeyless usage limited (x-rate-limit-limit: 25 observed); 2,500 names/mo with a free key
Rate limit100 requests/month on free planKeyless cap 25 per x-rate-limit-limit header; remaining/reset exposed in response headers
In directory since2026-07-052026-07-05
operationalpartialdownno data

Abstract Email Validation vs Nationalize.io: common questions

Which is more reliable, Abstract Email Validation or Nationalize.io?

On our scheduled checks, Nationalize.io leads on measured uptime — Abstract Email Validation at —% versus Nationalize.io 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 Abstract Email Validation and Nationalize.io need an API key?

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

Can I call Abstract Email Validation and Nationalize.io from the browser?

Yes — both Abstract Email Validation and Nationalize.io 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 Abstract Email Validation and Nationalize.io free for commercial use?

Abstract Email Validation has unclear commercial terms, and Nationalize.io 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.