Headers

{
  "checkedAt": "2026-10-13T09:00:00.000Z",
  "cookies": {
    "count": 1,
    "withoutFlags": [
      {
        "missing": [
          "Secure",
          "SameSite"
        ],
        "name": "session"
      }
    ]
  },
  "finalUrl": "https://example.com/",
  "grade": "D",
  "headers": {
    "contentSecurityPolicy": {
      "advice": "add a Content-Security-Policy with default-src",
      "ok": false,
      "present": false,
      "value": null
    },
    "strictTransportSecurity": {
      "advice": "ok",
      "ok": true,
      "present": true,
      "value": "max-age=31536000"
    }
  },
  "leaks": [
    {
      "header": "server",
      "value": "nginx/1.25.3"
    }
  ],
  "score": 4,
  "status": 200,
  "url": "https://example.com/"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.sitecheck-api.workers.dev/api/headers?url=example.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/headers?url=example.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 $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
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 $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.sitecheck-api.workers.dev%2Fapi%2Fheaders
const res = await pay("https://api.sitecheck-api.workers.dev/api/headers?url=example.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 $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
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/headers?url=example.com")
    print(res.status_code, res.text)