Tool detail

Email Validation API

Validates up to 25 email addresses per call for RFC syntax, MX records, disposable/role/free-provider flags, returning an ok/risky/invalid verdict per address.

Categories: Contact enrichment

Use when

clean a mailing list before sending a campaign
check if an email domain has valid MX records
flag disposable or role-account addresses in a signup form

Not for

not an SMTP mailbox probe — DNS-level checks only, cannot confirm a mailbox exists
not for more than 25 addresses in one call

Inputs

GET query param: emails (comma-separated, up to 25 addresses, required)

Admitted input schema

{
  "type": "object",
  "properties": {
    "emails": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "comma-separated email addresses, up to 25 per call (a single address works too)"
    }
  },
  "required": [
    "emails"
  ],
  "additionalProperties": false
}

Endpoint

Method: GET
URL: https://api.kadec0.xyz/v1/email-validate

Payment

Protocol: x402
Listed price: 0.03 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: GET https://api.kadec0.xyz/v1/email-validate
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z