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Abstract Email Validation vs RSQ API

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

APIAbstract Email ValidationREACHABLE—RSQ APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — 100 requests/monthFree — limits not published
Rate limit100 requests/month on free planUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Abstract Email Validation vs RSQ API: common questions

Which is more reliable, Abstract Email Validation or RSQ API?

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

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

Can I call Abstract Email Validation and RSQ API from the browser?

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

Are Abstract Email Validation and RSQ API free for commercial use?

Abstract Email Validation has unclear commercial terms, and RSQ 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.