ToolVet
80trust / 100

Check

by Maxwell x402 in Onchain & crypto

x402 APIPassing, checked 3 h ago

Checks one http(s) URL without paying it: whether it returns a valid x402 payment challenge, its USDC price against the median of its category, the payTo wallets and their USDC received in the last 30 days where our collector has them, and our own probe history (uptime since first seen). Signals with sources; a factual report, not a safety verdict.

GET
https://api.maxwellinternational.ai/v1/x402/endpoint/check
Price
$0.002
per call in USDC
Uptime
100%
last 30 days
Response time
271 ms
412 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 · Watch with other listings

How to call it

GET https://api.maxwellinternational.ai/v1/x402/endpoint/check

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.maxwellinternational.ai/v1/x402/endpoint/check?url=https%3A%2F%2Fwww.x402scan.com%2Fapi%2Fx402%2Fresources

Example response

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

Example response, 39 lines
{
  "answeredCorrectly": true,
  "checkedAt": "2026-10-05T09:41:27.566Z",
  "history": {
    "firstSeenAt": "2026-09-29T08:09:12.795Z",
    "probes": 31,
    "uptime": 0.8387096774193549,
    "windowDays": 6
  },
  "host": "www.x402scan.com",
  "latencyMs": 303,
  "payTo": [
    "0x2EC4545f96A24876764bF2B04D54E66A1351bE71"
  ],
  "paywall": {
    "problems": [],
    "state": "ok_402",
    "x402Version": 2
  },
  "price": {
    "asset": "USDC",
    "categoryMedianUsd": 0.01,
    "network": "eip155:8453",
    "usd": 0.01,
    "vsCategory": "at_median"
  },
  "reachable": true,
  "settlements": {
    "base": {
      "distinctPayers30d": 32,
      "last30dTx": 943,
      "last30dUsdc": 9.82,
      "lastPaymentAt": "2026-09-15"
    },
    "solana": null
  },
  "settlementsNote": "USDC received by the payTo in the last 30 days, from public chain data.",
  "url": "https://www.x402scan.com/api/x402/resources"
}

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.maxwellinternational.ai/v1/x402/endpoint/check?url=https%3A%2F%2Fwww.x402scan.com%2Fapi%2Fx402%2Fresources'

# 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.maxwellinternational.ai/v1/x402/endpoint/check?url=https%3A%2F%2Fwww.x402scan.com%2Fapi%2Fx402%2Fresources' \
  | 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.maxwellinternational.ai%2Fv1%2Fx402%2Fendpoint%2Fcheck
const res = await pay("https://api.maxwellinternational.ai/v1/x402/endpoint/check?url=https%3A%2F%2Fwww.x402scan.com%2Fapi%2Fx402%2Fresources");
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.maxwellinternational.ai/v1/x402/endpoint/check?url=https%3A%2F%2Fwww.x402scan.com%2Fapi%2Fx402%2Fresources")
    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 agoPassed402242 ms$0.002
6 h agoPassed402202 ms$0.002
9 h agoPassed402271 ms$0.002
13 h agoPassed402142 ms$0.002
18 h agoPassed402222 ms$0.002
Show 10 older checks
23 h agoPassed402410 ms$0.002
28 h agoPassed402283 ms$0.002
33 h agoPassed402275 ms$0.002
39 h agoPassed402270 ms$0.002
44 h agoPassed402267 ms$0.002
2 days agoPassed402296 ms$0.002
2 days agoPassed402284 ms$0.002
2 days agoPassed402278 ms$0.002
3 days agoPassed402263 ms$0.002
3 days agoPassed402380 ms$0.002