# Halowerk Email Validation

> Halowerk Email Validation is a paid API for AI agents from tools.halowerk.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-22).

Validates an email address across syntax, domain, MX records, disposable/role/freemail checks, typo suggestions, and optionally performs an SMTP handshake to verify mailbox existence.

## Facts

- Endpoint: POST https://tools.halowerk.com/v1/email/validate?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Success rate: 0% of calls made through Zero
- Activations on Zero: 1
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-email-validation-1720b2c6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_e3_Jo29PJosbQf1dtdxgf

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-validation-1720b2c6 -d '<json body>'
```

Example prompt: Can you validate the email address 'john.doe@gmial.com' — check its syntax, domain, MX records, whether it's disposable or a role account, and also do the SMTP handshake to see if the mailbox actually exists?

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-layered email validation that goes beyond simple syntax checking — especially when disposable/role/freemail detection, typo suggestions, and optional SMTP mailbox verification are all needed in a single call. Ideal for signup flows, lead enrichment, and outreach list hygiene where deliverability confidence is critical.

## Known failure modes

- Invalid or malformed input email returns a syntax error with no further checks performed
- Domain does not exist or has no DNS records, causing MX check failure
- SMTP handshake times out or is rejected by the remote server, resulting in an inconclusive mailbox check
- Rate limiting if too many requests are sent in a short period
- Network issues may cause intermittent failures on the SMTP verification step

## How this service works

Syntax, Domain, MX-Einträge, Wegwerf-Anbieter, Rollenkonto, Freemailer, Tippfehler-Vorschlag und Zustellwahrscheinlichkeit. Optional SMTP-Handshake für Postfachprüfung.

## Output

Returns a structured report covering: syntax validity, domain existence, MX record presence, whether the address belongs to a known disposable provider, role account (e.g. info@, support@), or freemail service (e.g. Gmail), a typo correction suggestion if the domain looks misspelled, a numerical deliverability probability, and optionally an SMTP handshake result confirming whether the specific mailbox exists.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "email": {
   "type": "string"
  },
  "emails": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "description": "Stapel bis 50 Adressen, ein Preis pro Aufruf"
  },
  "smtp_check": {
   "type": "boolean",
   "default": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-email-validation-1720b2c6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tools.halowerk.com](https://www.zero.xyz/host/tools.halowerk.com/llms.txt)