No merchant-supplied description has been published for mail.halowerk.com. Browse its currently listed x402 offerings and observed catalog information.
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DNS and list based verification. Never claims that a mailbox exists without evidence: without an SMTP probe the verdict for a routable address is "unknown", not "valid".
https://mail.halowerk.com/emailSame checks as /email, executed concurrently with one DNS lookup per distinct domain. The 402 quotes the exact amount for the number of addresses in the request body.
https://mail.halowerk.com/email/batchCheck up to 100 email addresses in one paid call, billed per address.
https://mail.halowerk.com/email/batchDNS and list based verification. Never claims that a mailbox exists without evidence: without an SMTP probe the verdict for a routable address is "unknown", not "valid".
https://mail.halowerk.com/email