Tool detail

Email Verifier & Validator

Checks one email address and returns valid, invalid or risky, split into username/domain, flagging free providers and role accounts.

Categories: Contact enrichment

Use when

check whether an email address can actually receive mail
flag a signup address as a free provider or role account

Not for

not for batches — one address per call only

Inputs

POST JSON body: { email: string (required), max 320 chars }

Admitted input schema

{
  "type": "object",
  "properties": {
    "email": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "The single email address to check, such as [email protected]. Maximum 320 characters."
    }
  },
  "required": [
    "email"
  ],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://email-verifier.underscoredone.com/verify

Payment

Protocol: x402
Listed price: 0.01 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://email-verifier.underscoredone.com/verify
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z