ToolVet
16trust / 100

Diagnose

by x402 Doctor in Onchain & crypto

x402 APIFailing, checked 4 h ago

Why is my x402 endpoint broken? Diagnose and debug an x402 payment endpoint (or MCP server) when payments fail: checks the 402 challenge, accepts[] (network, payTo, amount, asset), resource URL, Solana settlement readiness, which wallets and agents can pay, Bazaar/OpenAPI discovery and the browser paywall. Returns every check with a fix hint. Read-only: never pays.

GET
https://x402-doctor.onrender.com/api/v1/diagnose
Price
$0.01
per call in USDC
Uptime
0.0%
last 30 days
Response time
-
no timed checks yet
Last check
Failed
4 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed 4 h ago: Amount "0.01" is not in atomic token units

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

How to call it

GET https://x402-doctor.onrender.com/api/v1/diagnose

Each call costs $0.01 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://x402-doctor.onrender.com/api/v1/diagnose?method=GET&url=https%3A%2F%2Fichimoku-signal.fizzl.eu%2Fsignal%2FBTC-USDT

Parameters

ParameterTypeRequiredDescription
methodstringNoHTTP method of the endpoint. Default: try GET, then POST. One of: GET, POST.
urlstringYesThe x402 endpoint to diagnose (public http(s) URL).

Example response

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

{
  "challenge": null,
  "checks": [
    {
      "group": "challenge",
      "id": "returns-402",
      "message": "Endpoint returns 402 Payment Required for GET.",
      "status": "pass"
    }
  ],
  "method": "GET",
  "overall": "pass",
  "url": "https://ichimoku-signal.fizzl.eu/signal/BTC-USDT"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://x402-doctor.onrender.com/api/v1/diagnose?method=GET&url=https%3A%2F%2Fichimoku-signal.fizzl.eu%2Fsignal%2FBTC-USDT'

# 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://x402-doctor.onrender.com/api/v1/diagnose?method=GET&url=https%3A%2F%2Fichimoku-signal.fizzl.eu%2Fsignal%2FBTC-USDT' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fx402-doctor.onrender.com%2Fapi%2Fv1%2Fdiagnose
const res = await pay("https://x402-doctor.onrender.com/api/v1/diagnose?method=GET&url=https%3A%2F%2Fichimoku-signal.fizzl.eu%2Fsignal%2FBTC-USDT");
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://x402-doctor.onrender.com/api/v1/diagnose?method=GET&url=https%3A%2F%2Fichimoku-signal.fizzl.eu%2Fsignal%2FBTC-USDT")
    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
4 h agoAmount "0.01" is not in atomic token units402220 ms$0.01
8 h agoAmount "0.01" is not in atomic token units402742 ms$0.01
13 h agoAmount "0.01" is not in atomic token units402227 ms$0.01
19 h agoAmount "0.01" is not in atomic token units402233 ms$0.01
25 h agoAmount "0.01" is not in atomic token units402254 ms$0.01
Show 10 older checks
30 h agoAmount "0.01" is not in atomic token units402258 ms$0.01
36 h agoAmount "0.01" is not in atomic token units402239 ms$0.01
42 h agoAmount "0.01" is not in atomic token units402226 ms$0.01
47 h agoAmount "0.01" is not in atomic token units402251 ms$0.01
2 days agoAmount "0.01" is not in atomic token units402245 ms$0.01
2 days agoAmount "0.01" is not in atomic token units402573 ms$0.01
3 days agoAmount "0.01" is not in atomic token units402231 ms$0.01
3 days agoAmount "0.01" is not in atomic token units402265 ms$0.01
3 days agoAmount "0.01" is not in atomic token units402265 ms$0.01
3 days agoAmount "0.01" is not in atomic token units402630 ms$0.01