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HALOWERK Multi-At-Sign Email Review
x402
HALOWERK Multi-At-Sign Email Review is a paid API for AI agents from buero.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-26).
Validates a batch of email addresses for multiple at-sign (@) issues, flagging malformed emails that contain more than one @ character.
Price / call$0.004
Success—
StatusUnknown
How this service works
Import repair: identify multiple at signs requiring source inspection. Reuses the existing email-list-clean motor. No SMTP probes or mailbox existence/catch-all proof. Local part case, plus and dots are never folded. Up to500 source rows;65s engine bound,70s article bound; one inflight native mail process. Price0.001 USDC plus existing motor quote, minimum0.004; supplied rows including rejected/duplicates billed.
Output
A JSON response indicating which email addresses in the submitted batch have multiple at-sign (@) characters, including validation status and any flagged malformed entries.
Example use cases
Pre-campaign email list cleanup
“I have a CSV of 300 subscriber emails I'm about to use for a newsletter blast — can you run them through the multi-at-sign checker to catch any malformed ones before I send?”
CRM import quality gate
“We're importing a batch of 150 leads into our CRM and I need to flag any email addresses that have more than one @ symbol before they get saved — can you validate them?”
User registration data audit
“Can you review these 80 email addresses collected from our sign-up form last week and tell me which ones have multiple @ signs so we can follow up with those users?”
Technical details
Endpoint
POSThttps://buero.halowerk.com/v1/baumarkt/mail/multi-at-sign-review?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to batch-validate up to 500 email addresses specifically for the multi-at-sign defect (e.g. user@@domain.com or user@bad@domain.net) as part of a data hygiene pipeline, CRM import, or pre-send email list cleanup. It is purpose-built for this specific malformation check rather than general email syntax validation.
Side effects
- Empty emails array returns a 400 validation error
- Emails array exceeding 500 items triggers a payload too large error
- Non-string items in the emails array cause schema validation failure
- Payment not included or insufficient USDC triggers a 402 Payment Required response
- Individual email strings exceeding 320 characters are rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| emails | array |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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