Dns

{
  "a": [
    "93.184.216.34"
  ],
  "aaaa": [
    "2606:2800:220:1:248:1893:25c8:1946"
  ],
  "bimi": null,
  "caa": [
    {
      "flags": 0,
      "tag": "issue",
      "value": "letsencrypt.org"
    }
  ],
  "checkedAt": "2026-10-13T09:00:00.000Z",
  "dkim": {
    "found": [],
    "selectorsChecked": [
      "default",
      "google",
      "selector1",
      "selector2",
      "k1",
      "s1",
      "s2",
      "mail",
      "dkim"
    ]
  },
  "dmarc": {
    "pct": 100,
    "policy": "reject",
    "record": "v=DMARC1; p=reject",
    "rua": null,
    "subdomainPolicy": null
  },
  "domain": "example.com",
  "exists": true,
  "issues": [
    "no DKIM key under the common selectors (a key with another selector is not visible)",
    "no MTA-STS policy"
  ],
  "mailGrade": "B",
  "mailScore": 7,
  "mtaSts": null,
  "mx": [],
  "ns": [
    "a.iana-servers.net",
    "b.iana-servers.net"
  ],
  "nullMx": false,
  "source": "DNS over HTTPS (Cloudflare, Google)",
  "spf": {
    "all": "-",
    "lookups": 0,
    "mechanisms": [
      "-all"
    ],
    "record": "v=spf1 -all"
  },
  "tlsRpt": null,
  "txt": [
    "v=spf1 -all"
  ]
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.sitecheck-api.workers.dev/api/dns?domain=gmail.com'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://api.sitecheck-api.workers.dev/api/dns?domain=gmail.com' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

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

// Pays at most $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.sitecheck-api.workers.dev%2Fapi%2Fdns
const res = await pay("https://api.sitecheck-api.workers.dev/api/dns?domain=gmail.com");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.sitecheck-api.workers.dev/api/dns?domain=gmail.com")
    print(res.status_code, res.text)