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Halowerk Email List Cleaner
x402
Halowerk Email List Cleaner is a paid API for AI agents from buero.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-12).
Validates and cleans a batch of up to 500 email addresses, flagging duplicates, invalid formats, and suspicious domains without sending any email.
Price / call$0.003
Success—
StatusUnknown
How this service works
Up to 500 input addresses, billed per supplied row including duplicates/invalid rows: 0.0001 USDC per address, minimum 0.003 and maximum 0.050. Reuses the existing mail checker; one inflight domain lookup is shared within the bounded process and existing domain cache is retained. Original rows, exact-local-part/IDNA-domain duplicates, candidates, removals and review cases remain traceable. No mailbox proof without SMTP; SMTP disabled, catch-all unknown, no email sent.
Output
Returns the original rows with each address classified — confirmed valid, duplicate (exact local-part and IDNA-normalized domain), candidate for removal, or flagged for manual review. Domain cache is shared within the process. No SMTP mailbox verification is performed; catch-all status is reported as unknown. Traceable per-row output allows downstream filtering.
Example use cases
Pre-campaign email list scrub
“I have a CSV with 350 subscriber emails from our last webinar. Can you clean the list, remove any duplicates and invalid addresses, and tell me which ones need review before I send the follow-up campaign?”
CRM import deduplication
“Before I import these 180 contact emails into our CRM, can you run them through a validation check to strip out malformed addresses, exact duplicates, and anything that looks risky?”
Lead database hygiene
“We scraped about 400 email addresses from our sign-up forms over the past year and I suspect there's a lot of junk in there. Can you validate and deduplicate the whole list and flag anything I should manually review?”
Technical details
Endpoint
POSThttps://buero.halowerk.com/v1/email-list-clean?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need bulk email hygiene on up to 500 addresses in a single call, with per-row traceability for duplicates, invalid formats, and suspicious domains — without triggering any SMTP probes or sending email. Prefer it over SMTP-verifying services when avoiding mailbox pings is a compliance or deliverability concern. Best suited for pre-import CRM hygiene, pre-send campaign scrubbing, or periodic contact database maintenance.
Side effects
- List exceeds 500 addresses — request rejected
- Empty list or all items fail minimum length — validation error
- Malformed JSON input schema — 400 error
- Addresses with non-ASCII domains are IDNA-normalized; normalization failures may flag the row
- Catch-all domain detection returns unknown when SMTP is disabled
- Billing minimum of 0.003 USDC charged even for very small lists
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| emails | array |
Tags
x402
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