A free email validation API you can call without a key

Updated 2026-10-17 · Data and API builders · by CyberMax

Short answer

Call Mailvett's validate endpoint with the address: it checks syntax, whether the domain has mail servers (MX), whether it is a disposable or role address (info@, sales@), suggests fixes for typos like gmial.com, and returns a verdict and a 0-100 score. The free tier is 50 calls a day without a key; up to 10 addresses per call.

Copy-paste code

One address, then several in one POST

curl "https://mailvett.cybermaxtools.com/api/validate?email=someone@gmial.com"

curl -X POST https://mailvett.cybermaxtools.com/api/validate \
  -H 'Content-Type: application/json' \
  -d '{"emails": ["ana@example.com", "info@company.com", "x@mailinator.com"]}'

Good to know

Validate at the moment of signup (and suggest the typo fix to the person) rather than cleaning a list months later.

No validator can promise an inbox exists without sending mail; a good one tells you which addresses are certainly bad and which are risky.

Mailvett API: Catch bad emails before you send or save

from $5

Mailvett validates up to 10 addresses per call (syntax, MX, provider, disposable, role, typo fixes, domain age, SPF, DMARC) with a verdict and score. Free: 50 calls a day; packs start small with no subscription.

Get Mailvett API: $5 See what's inside Try it

Secure checkout · 14-day fix-or-refund if it doesn't work as described (terms)

Questions

Does it send an email to check?

No. It checks syntax, DNS and known lists; it never sends mail.

What does a role address mean?

A shared address like info@ or support@; fine for business contacts, often unwanted in a consumer signup.

Free: the Free API Starter Kit

Copy-paste calls for 4 APIs with free daily tiers (CVE priority, VIN recalls, US duty rates, email checks), then 5 short emails on KEV/EPSS, MCP and free data.