# Halowerk Email List Cleaner

> 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.

## Facts

- Endpoint: POST https://buero.halowerk.com/v1/email-list-clean?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-email-list-cleaner-2ec4813f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sVwy6sJ5Be1UzKZa5tXVu

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability halowerk-email-list-cleaner-2ec4813f -d '<json body>'
```

Example prompt: Can you clean this list of email addresses for me? I have about 200 contacts I collected from a sign-up form and I want to remove duplicates, invalid formats, and any suspicious ones before I import them into my mailing list.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "emails": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 320,
    "minLength": 1
   },
   "maxItems": 500,
   "minItems": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-email-list-cleaner-2ec4813f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from buero.halowerk.com](https://www.zero.xyz/host/buero.halowerk.com/llms.txt)