ToolVet
15trust / 100

Agent Intel Subdomain Takeover Monitor

by SiteCheck Agent Intel & Dev in Developer tools

x402 APIFailing, checked 8 h ago

Subdomain takeover check: lists up to 10 subdomains seen in certificate transparency logs for a domain (Cert Spotter), fetches each over HTTPS, and flags pages that show a known 'unclaimed service' message (GitHub Pages, S3, Heroku, Fastly). Looks at the page text only, not DNS records, so it can miss dangling records that show no such message.

GET
https://api.fadeandco.workers.dev/api/agent-intel/subdomain-takeover-monitor
Price
$0.002
per call in USDC
Uptime
0.0%
last 30 days
Response time
-
no timed checks yet
Last check
Failed
8 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed 8 h ago: Amount "0.002" is not in atomic token units

Status and outage history · Atom feed · Watch with other listings

How to call it

GET https://api.fadeandco.workers.dev/api/agent-intel/subdomain-takeover-monitor

Each call costs $0.002 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://api.fadeandco.workers.dev/api/agent-intel/subdomain-takeover-monitor?domain=example.org

Parameters

ParameterTypeRequiredDescription
domainstringYesDomain such as example.org (a URL is reduced to its host)

Example response

The provider's example. We can't check it without paying.

{
  "checkedAt": "2026-10-23T09:35:22.841Z",
  "checkedSubdomains": 1,
  "domain": "example.org",
  "note": "Page-text check only; a page that is not one of the known messages is reported OK, which is not proof the DNS record is safe. Max 10 subdomains per call.",
  "possibleTakeovers": 0,
  "results": [
    {
      "host": "www.example.org",
      "httpStatus": 200,
      "service": null,
      "verdict": "OK"
    }
  ],
  "source": "https://api.certspotter.com/v1/issuances"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.002.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.fadeandco.workers.dev/api/agent-intel/subdomain-takeover-monitor?domain=example.org'

# 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.fadeandco.workers.dev/api/agent-intel/subdomain-takeover-monitor?domain=example.org' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// 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.fadeandco.workers.dev%2Fapi%2Fagent-intel%2Fsubdomain-takeover-monitor
const res = await pay("https://api.fadeandco.workers.dev/api/agent-intel/subdomain-takeover-monitor?domain=example.org");
console.log(res.status, await res.text());
Python: pay and call
# 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.fadeandco.workers.dev/api/agent-intel/subdomain-takeover-monitor?domain=example.org")
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
8 h agoAmount "0.002" is not in atomic token units402792 ms$0.002
16 h agoAmount "0.002" is not in atomic token units40291 ms$0.002
24 h agoAmount "0.002" is not in atomic token units402961 ms$0.002
32 h agoAmount "0.002" is not in atomic token units402126 ms$0.002
41 h agoAmount "0.002" is not in atomic token units40230 ms$0.002
Show 10 older checks
2 days agoAmount "0.002" is not in atomic token units402102 ms$0.002
2 days agoAmount "0.002" is not in atomic token units40298 ms$0.002
3 days agoAmount "0.002" is not in atomic token units402117 ms$0.002
3 days agoAmount "0.002" is not in atomic token units40245 ms$0.002
3 days agoAmount "0.002" is not in atomic token units40292 ms$0.002
4 days agoAmount "0.002" is not in atomic token units402280 ms$0.002
4 days agoAmount "0.002" is not in atomic token units40288 ms$0.002
4 days agoAmount "0.002" is not in atomic token units402110 ms$0.002
4 days agoAmount "0.002" is not in atomic token units402105 ms$0.002
5 days agoAmount "0.002" is not in atomic token units40258 ms$0.002