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ListLoco API vs MailboxValidator Free Email Checker

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

APIListLoco APIHEALTHY100MailboxValidator Free Email CheckerHEALTHY94
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms127527
P95 · ms4431138
AuthnoneapiKey
CORSnono
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

ListLoco API vs MailboxValidator Free Email Checker: common questions

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

Both are neck-and-neck — ListLoco API and MailboxValidator Free Email Checker 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, ListLoco API or MailboxValidator Free Email Checker?

ListLoco API has the lower median latency in our checks — ListLoco API responds in 127 ms versus MailboxValidator Free Email Checker at 527 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 ListLoco API and MailboxValidator Free Email Checker need an API key?

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

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

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

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

ListLoco 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.