ToolVet
78trust / 100

Site Watch

by TrollBridge in Onchain & crypto

x402 APIPassing, checked 3 h ago

Change detection ($0.05) — sha256 fingerprint of any URL with a compact diff when it changes. Pass the hash back on the next call; stateless, nothing stored. Toll: $0.05 USDC on Base or Solana.

GET
https://mini-tollbooth.onrender.com/site-watch
Price
$0.05
per call in USDC
Uptime
100%
last 30 days
Response time
216 ms
611 ms 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

How to call it

GET https://mini-tollbooth.onrender.com/site-watch

Each call costs $0.05 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://mini-tollbooth.onrender.com/site-watch?prev_hash=abc123&url=https%3A%2F%2Fexample.com

Parameters

ParameterTypeRequiredDescription
prev_hashstringNoOptional sha256 from a previous /site-watch call — returns whether it changed.
prev_textstringNoOptional previous page text — enables a diff snippet when the hash changed.
prev_text_b64stringNoOptional base64 of the previous page text (alternative to prev_text).
urlstringYesURL to hash for change detection (http/https only).

Example response

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

{
  "changed": false,
  "description": "Change detection ($0.05) — sha256 fingerprint of any URL with a compact diff when it changes. Pass the hash back on the next call; stateless, nothing stored.",
  "hash": "a1082fcfb96e…",
  "lane": "/site-watch",
  "note": "…",
  "text_length": 182,
  "url": "https://example.com"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.05.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://mini-tollbooth.onrender.com/site-watch?prev_hash=abc123&url=https%3A%2F%2Fexample.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://mini-tollbooth.onrender.com/site-watch?prev_hash=abc123&url=https%3A%2F%2Fexample.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 $0.05 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.05" });
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 $0.05 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fmini-tollbooth.onrender.com%2Fsite-watch
const res = await pay("https://mini-tollbooth.onrender.com/site-watch?prev_hash=abc123&url=https%3A%2F%2Fexample.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 $0.05 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.05"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://mini-tollbooth.onrender.com/site-watch?prev_hash=abc123&url=https%3A%2F%2Fexample.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 agoPassed402206 ms$0.05
7 h agoPassed402244 ms$0.05
11 h agoPassed402224 ms$0.05
15 h agoPassed402207 ms$0.05
20 h agoPassed402198 ms$0.05
Show 10 older checks
24 h agoPassed402568 ms$0.05
28 h agoPassed402216 ms$0.05
32 h agoPassed402184 ms$0.05
36 h agoPassed402537 ms$0.05
39 h agoPassed402208 ms$0.05
43 h agoPassed402329 ms$0.05
47 h agoPassed402195 ms$0.05
2 days agoPassed402195 ms$0.05
2 days agoPassed402594 ms$0.05
2 days agoPassed402611 ms$0.05