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MailboxValidator Free Email Checker vs Vector Express v2.0

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

APIMailboxValidator Free Email CheckerHEALTHY94Vector Express v2.0HEALTHY91
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms527613
P95 · ms11381662
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree
Rate limitUnpublished5 req/window · 4 remaining · resets 1783513379
In directory since2026-07-052026-07-05
operationalpartialdownno data

MailboxValidator Free Email Checker vs Vector Express v2.0: common questions

Which is more reliable, MailboxValidator Free Email Checker or Vector Express v2.0?

Both are neck-and-neck — MailboxValidator Free Email Checker and Vector Express v2.0 each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, MailboxValidator Free Email Checker or Vector Express v2.0?

MailboxValidator Free Email Checker has the lower median latency in our checks — MailboxValidator Free Email Checker responds in 527 ms versus Vector Express v2.0 at 613 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 MailboxValidator Free Email Checker and Vector Express v2.0 need an API key?

Vector Express v2.0 needs no key, while MailboxValidator Free Email Checker requires a free API key. If you want to start calling without signup, reach for Vector Express v2.0 first.

Can I call MailboxValidator Free Email Checker and Vector Express v2.0 from the browser?

Neither sends browser-friendly CORS headers reliably, so call MailboxValidator Free Email Checker and Vector Express v2.0 from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are MailboxValidator Free Email Checker and Vector Express v2.0 free for commercial use?

MailboxValidator Free Email Checker has unclear commercial terms, and Vector Express v2.0 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.