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HALOWERK buerowerk SMTP Octet-Compatibility Email Validator
x402
HALOWERK buerowerk SMTP Octet-Compatibility Email Validator is a paid API for AI agents from buero.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-22).
Validates a list of email addresses for SMTP octet-compatibility, checking conformance with mail server constraints.
Price / call$0.004
Success—
StatusUnknown
How this service works
HALOWERK buerowerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.
Output
A JSON response indicating the SMTP octet-compatibility status of each submitted email address, likely including per-address results or a summary of which addresses pass or fail SMTP octet constraints.
Example use cases
Pre-campaign email list cleanup
“I have a list of 200 subscriber emails I'm about to send a newsletter to — can you validate them all for SMTP octet compatibility so I don't bounce?”
New user registration email check
“Before we store these newly registered user emails in our system, can you run them through the SMTP octet-compatibility check to make sure they're deliverable?”
CRM import deliverability audit
“We just imported a contact list from a legacy CRM with some weird international addresses — can you check all of them for SMTP octet compatibility issues?”
Technical details
Endpoint
POSThttps://buero.halowerk.com/v1/baumarkt/mail/smtp-octet-compatibility?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to validate email addresses specifically for SMTP octet-level compatibility — particularly useful for international or unusual addresses before bulk sending, or when pre-screening user-submitted emails for mail server conformance. Prefer this over generic format validators when SMTP delivery compliance (not just RFC syntax) is the concern.
Side effects
- Empty email array returns validation error
- Email strings exceeding 320 characters are rejected
- Array exceeding 500 items is rejected
- Malformed JSON body returns 400 error
- Payment not provided or insufficient USDC results in 402 response
- Invalid email format may cause per-item failure in response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| emails | array |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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