Email Deliverability

Last 30 days

Uptime

100%

Response time

203 ms typical, 333 ms slowest 5%

Last check

2 h ago

Next check

any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://agent402.tools/api/email-deliverability" \
  -H "content-type: application/json" \
  -d '{"domain":"google.com"}'

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

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Femail-deliverability
const res = await pay("https://agent402.tools/api/email-deliverability", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"domain":"google.com"}),
});
console.log(await res.json());

Example input

{
  "domain": "google.com"
}

Example output

{
  "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"
}

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