ToolVet
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X402 Check

by x402 Endpoint Check | Blackwood in Other

x402 APIPassing, checked 5 h ago

Use when you need an x402 endpoint check or x402 endpoint test, or to validate x402 endpoint listings before paying or integrating. Do not use for actually paying the endpoint, or endpoints behind authentication. Returns JSON with an x402 check of an endpoint without paying: whether it answers 402, its payment options (scheme, network, asset, amount, payTo), Bazaar metadata and problems found for 0.007 USDC per call. Typical response time 2500 ms (p95). Category: Infrastructure.

POST
https://x402-gateway.blackwoodstate8.workers.dev/v1/x402-check
Price
$0.007
per call in USDC
Uptime
100%
last 30 days
Response time
1.2 s
2.3 s slowest 5%
Last check
Passed
5 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://x402-gateway.blackwoodstate8.workers.dev/v1/x402-check

Each call costs $0.007 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://x402-gateway.blackwoodstate8.workers.dev/v1/x402-check
content-type: application/json

{
  "url": "https://x402.org/protected"
}

Parameters

ParameterTypeRequiredDescription
bodyobjectNoJSON body to send with POST, e.g. {"url": "https://example.com"} (no payment is ever attached)
methodstringNoHTTP method of the endpoint (GET when omitted) One of: GET, POST.
urlstringYesPublic http(s) URL of the x402 endpoint, e.g. https://x402.org/protected

Example response

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

Example response, 41 lines
{
  "accepts": [
    {
      "amount": "10000",
      "amountUsd": 0.01,
      "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
      "maxTimeoutSeconds": 300,
      "network": "eip155:84532",
      "payTo": "0x209693Bc6afc0C5328bA36FaF03C514EF312287C",
      "scheme": "exact"
    },
    {
      "amount": "10000",
      "amountUsd": 0.01,
      "asset": "4zMMC9srt5Ri5X14GAgXhaHii3GnPAEERYPJgZJDncDU",
      "maxTimeoutSeconds": 300,
      "network": "solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1",
      "payTo": "CKPKJWNdJEqa81x7CkZ14BVPiY6y16Sxs7owznqtWYp5",
      "scheme": "exact"
    }
  ],
  "bazaar": {
    "inputSchema": false,
    "outputSchema": false,
    "present": false
  },
  "checkedAt": "2026-10-17T16:49:24.432Z",
  "finalUrl": "https://x402.org/protected",
  "problems": [
    "no_bazaar_metadata: without discovery metadata the endpoint is hard to find in the Bazaar"
  ],
  "resource": {
    "description": "Access to protected content",
    "mimeType": null,
    "url": "https://x402.vercel.app/protected"
  },
  "status": 402,
  "url": "https://x402.org/protected",
  "version": 2,
  "x402": true
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.007.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://x402-gateway.blackwoodstate8.workers.dev/v1/x402-check' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://x402.org/protected"}'

# 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://x402-gateway.blackwoodstate8.workers.dev/v1/x402-check' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://x402.org/protected"}' \
  | 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 $0.007 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.007" });
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 $0.007 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fx402-gateway.blackwoodstate8.workers.dev%2Fv1%2Fx402-check&method=POST
const res = await pay("https://x402-gateway.blackwoodstate8.workers.dev/v1/x402-check", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "url": "https://x402.org/protected"
  }),
});
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 $0.007 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.007"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://x402-gateway.blackwoodstate8.workers.dev/v1/x402-check",
        json={
            "url": "https://x402.org/protected",
        },
    )
    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
5 h agoPassed402780 ms$0.007
10 h agoPassed4021.3 s$0.007
16 h agoPassed402523 ms$0.007
21 h agoPassed4021.4 s$0.007
26 h agoPassed4021.6 s$0.007
Show 10 older checks
32 h agoPassed4021.4 s$0.007
37 h agoPassed402651 ms$0.007
42 h agoPassed402825 ms$0.007
46 h agoPassed402773 ms$0.007
2 days agoPassed4022.5 s$0.007
2 days agoPassed4021.9 s$0.007
3 days agoPassed4021.4 s$0.007
3 days agoPassed4021.2 s$0.007
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3 days agoPassed402840 ms$0.007