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GitHub REST API vs MailboxValidator Free Email Checker

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

APIGitHub REST APINEW—MailboxValidator Free Email CheckerNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

GitHub REST API vs MailboxValidator Free Email Checker: common questions

Which is more reliable, GitHub REST API or MailboxValidator Free Email Checker?

On our scheduled checks, MailboxValidator Free Email Checker leads on measured uptime — GitHub REST API at —% versus MailboxValidator Free Email Checker 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 GitHub REST API and MailboxValidator Free Email Checker need an API key?

GitHub REST API needs no key, while MailboxValidator Free Email Checker requires a free API key. If you want to start calling without signup, reach for GitHub REST API first.

Can I call GitHub REST API and MailboxValidator Free Email Checker from the browser?

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

Are GitHub REST API and MailboxValidator Free Email Checker free for commercial use?

GitHub REST API has unclear commercial terms, and MailboxValidator Free Email Checker 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.