Email deliverability check · Email Deliverability

import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPay("https://agent402.tools/api/email-deliverability", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "domain": "google.com"
  }),
});
const data = await res.json();

curl -X POST \
  "https://agent402.tools/api/email-deliverability" \
  -H "Content-Type: application/json" \
  -d '{"domain":"google.com"}' \
  -H "X-PAYMENT: <signed x402 payment>"

{
  "checks": [
    {
      "check": "spf",
      "detail": "SPF record present, 1 DNS lookup, ~all qualifier",
      "status": "pass"
    },
    {
      "check": "dmarc",
      "detail": "p=reject at 100% - strict enforcement",
      "status": "pass"
    },
    {
      "check": "dkim",
      "detail": "Found DKIM at selector 20221208 (2048-bit RSA)",
      "status": "pass"
    },
    {
      "check": "mx",
      "detail": "5 MX records configured",
      "status": "pass"
    }
  ],
  "dkim": {
    "found": [
      {
        "bits": 2048,
        "selector": "20221208",
        "valid": true
      }
    ],
    "probed": [
      "google",
      "selector1",
      "default",
      "20221208"
    ]
  },
  "dmarc": {
    "hasRecord": true,
    "percent": 100,
    "policy": "reject",
    "valid": true
  },
  "domain": "google.com",
  "mx": {
    "count": 5,
    "records": [
      "smtp.google.com"
    ]
  },
  "queriedAt": "2026-06-19T20:00:00.000Z",
  "score": 90,
  "spf": {
    "all": "softfail",
    "hasRecord": true,
    "lookupCount": 1,
    "valid": true
  },
  "summary": "good"
}