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HALOWERK buerowerk — Email Plus-Tag Disclosure
x402
HALOWERK buerowerk — Email Plus-Tag Disclosure is a paid API for AI agents from buero.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-18).
Analyzes a list of email addresses and discloses whether they contain plus-tag (subaddress) components (e.g. user+tag@domain.com)
Price / call$0.004
Success—
StatusUnknown
How this service works
HALOWERK buerowerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.
Output
Returns a JSON response indicating, for each submitted email address, whether a plus-tag (subaddress) was detected in the local part of the address. Likely includes fields such as the original email, a boolean flag for plus-tag presence, and possibly the extracted tag value.
Example use cases
Marketing list email hygiene check
“I have a mailing list of 200 email addresses and I want to know which ones are using plus-tag tricks like user+newsletter@gmail.com — can you scan them and flag the ones with subaddresses?”
Detecting duplicate signups via plus-tagging
“We're seeing suspicious sign-ups on our platform and think people are abusing plus-tag emails to create multiple accounts — can you check these emails and tell me which ones have a plus tag in them?”
Pre-send email validation for clean list
“Before I send out this campaign, can you check these email addresses and identify any that use plus-tag subaddressing so I can decide whether to include or exclude them?”
Technical details
Endpoint
POSThttps://buero.halowerk.com/v1/baumarkt/mail/plus-tag-disclosure?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically detect plus-tag subaddressing (the user+tag@domain pattern) across a batch of up to 500 email addresses. Prefer this over manual regex parsing when you need a reliable, hosted service for email subaddress disclosure at scale, especially within an x402 micropayment workflow on Base Mainnet.
Side effects
- Empty or missing emails array returns a validation error
- Emails exceeding 320 characters or shorter than 1 character are rejected
- Array exceeding 500 items may be rejected
- Malformed JSON body returns a 400 error
- Payment not provided or insufficient USDC balance triggers a 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| emails | array |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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