ToolVet
75trust / 100

Watch

by scrooge-x402-tool-mill.vercel.app in Other

x402 APIPassing, checked 3 h ago

Watch one public page for 7 days. Checks hourly. When the content hash changes, POST {watch_id,url,old_fingerprint,new_fingerprint,changed_at} to your https callback (5s timeout, one retry). POST JSON {"url":"https://example.com","callback_url":"https://example.com/hook"}. Returns {watch_id,url,expires,status_url}. Free status is GET /v1/watch/:id and does not show the callback. At 500 active watches, POST returns 503 before payment. $0.10 USDC on Base (eip155:8453). No API key.

POST
https://scrooge-x402-tool-mill.vercel.app/v1/watch
Price
$0.1
per call in USDC
Uptime
94.3%
last 30 days
Response time
704 ms
3.2 s slowest 5%
Last check
Passed
3 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

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

How to call it

POST https://scrooge-x402-tool-mill.vercel.app/v1/watch

Each call costs $0.1 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.

POST https://scrooge-x402-tool-mill.vercel.app/v1/watch
content-type: application/json

{
  "callback_url": "https://example.com/hook",
  "url": "https://example.com"
}

Parameters

ParameterTypeRequiredDescription
callback_urlstring (uri)YesPublic https URL that receives one POST when the page content hash changes
urlstring (uri)YesPublic http(s) URL to fetch (SSRF-safe; private/link-local blocked)

Example response

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

{
  "expires": "2026-10-12T00:00:00.000Z",
  "status_url": "https://scrooge-x402-tool-mill.vercel.app/v1/watch/0123456789abcdef0123456789abcdef",
  "url": "https://example.com/",
  "watch_id": "0123456789abcdef0123456789abcdef"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.1.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://scrooge-x402-tool-mill.vercel.app/v1/watch' \
  -H 'content-type: application/json' \
  --data-raw '{"callback_url":"https://example.com/hook","url":"https://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 - -X POST 'https://scrooge-x402-tool-mill.vercel.app/v1/watch' \
  -H 'content-type: application/json' \
  --data-raw '{"callback_url":"https://example.com/hook","url":"https://example.com"}' \
  | 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 $0.1 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.1" });
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 $0.1 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fscrooge-x402-tool-mill.vercel.app%2Fv1%2Fwatch&method=POST
const res = await pay("https://scrooge-x402-tool-mill.vercel.app/v1/watch", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "callback_url": "https://example.com/hook",
    "url": "https://example.com"
  }),
});
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 $0.1 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.1"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://scrooge-x402-tool-mill.vercel.app/v1/watch",
        json={
            "callback_url": "https://example.com/hook",
            "url": "https://example.com",
        },
    )
    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
3 h agoPassed402427 ms$0.1
8 h agoPassed402487 ms$0.1
12 h agoPassed402463 ms$0.1
17 h agoPassed402722 ms$0.1
22 h agoPassed402474 ms$0.1
Show 10 older checks
27 h agoPassed4023.2 s$0.1
31 h agoPassed402469 ms$0.1
36 h agoPassed402604 ms$0.1
40 h agoExpected HTTP 402, got 500500508 ms-
43 h agoExpected HTTP 402, got 502502675 ms-
2 days agoPassed402470 ms$0.1
2 days agoPassed402476 ms$0.1
2 days agoPassed402774 ms$0.1
3 days agoPassed402704 ms$0.1
3 days agoPassed402736 ms$0.1