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Email Verifier & Validator

email-verifier.underscoredone.com · x402

Takes one email address and tells you whether it can actually receive mail. Returns a verdict of valid, invalid, or risky, splits the address into username and domain, and flags free providers and role accounts like admin@ or support@. One address per call.
Name and description as published by x402 Bazaar

Live

Last successful check: 25 Oct 2026, 19:51 UTC.

answered, last 24 hours
100%
answered, last 30 days
100%
How addrbook checks →

Connect

https://email-verifier.underscoredone.com/verify

x402: an unpaid request gets a 402 with the price and pay-to wallet. addrbook never pays.

Who's behind it

Listed by
  • x402 Bazaarlast seen UTC
Wallets named
  • 0xe9740820225b3918b4ddd1292c7ca4ca0e2c2f08named by x402 Bazaar
Listed since

Payments

different wallets paid it, last 30 days
3
paid calls, last 30 days
5
last paid call (UTC)

As the x402 Bazaar reports, from payments Coinbase's facilitator settled. Read . addrbook has not counted these payments itself.

Its x402 endpoints have not listed a payment option addrbook could read yet.

Checks by endpoint

HostProtocolStateLast checked (UTC)Last answered (UTC)24 hours30 daysTools
email-verifier.underscoredone.comx402Live100%100%—

Also listed as

Other entries that share an endpoint with this one.