Email validate

Validate an email address: syntax check plus live MX record lookup on the domain (deliverability signal, not a guarantee).

Input

Field	Type	Description
email *	string	Email address to check

Example output

{
  "email": "ada@example.com",
  "syntaxValid": true,
  "domain": "example.com",
  "mxRecords": [
    "mail.example.com"
  ],
  "deliverableDomain": true
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/email-validate \
  -H "Content-Type: application/json" \
  -d '{"email":"ada@example.com"}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/email-validate", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "email": "ada@example.com"
  }),
});

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