Tool detail

Agent Email Check

Checks an email address via DNS and list-based verification and returns one of five verdicts: deliverable, undeliverable, invalid, risky or unknown.

Categories: Contact enrichment

Use when

check whether an email address is likely valid before sending
screen a signup email for disposable or role-account risk
verify an address's domain has mail routing before contacting it

Not for

not proof a mailbox exists without the optional SMTP probe - stays "unknown"
SMTP probe is disabled on this instance regardless of the smtp_check input

Inputs

POST JSON body: { email: string (required), smtp_check: boolean (optional, default false) }

Admitted input schema

{
  "type": "object",
  "properties": {
    "email": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "The email address to check."
    },
    "smtp_check": {
      "type": "boolean",
      "description": "Ask for an optional SMTP probe. Off by default, heavily throttled, one attempt per target and never retried. Without it the verdict of a routable address stays \"unknown\".",
      "default": false
    }
  },
  "required": [
    "email"
  ],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://mail.halowerk.com/email

Payment

Protocol: x402
Listed price: 0.001 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: POST https://mail.halowerk.com/email
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z