ToolVet
80trust / 100

Toolfit Check

by ToolFit by YourAITools in Onchain & crypto

x402 APIPassing, checked 2 h ago

MCP server checker API. Preflight a public remote MCP server before connecting or paying: does it answer an MCP initialize, which protocol version, sign-in method (OAuth metadata), x402 payment terms, latency, tool count, token cost, provider compatibility, poisoning patterns in tools and instructions, and a grade with issues. Lists tools only, never calls them. Blocked or unresolvable URLs are never charged.

GET
https://api.youraitools.co/toolfit/v1/check
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
28 ms
277 ms slowest 5%
Last check
Passed
2 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.youraitools.co/toolfit/v1/check

Each call costs $0.005 in USDC on Polygon, 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.youraitools.co/toolfit/v1/check?url=https%3A%2F%2Fapi.youraitools.co%2Fmcp%2Fhub

Parameters

ParameterTypeRequiredDescription
urlstringYesPublic remote MCP server URL (Streamable HTTP, https), e.g. https://api.youraitools.co/mcp/hub. ToolFit only lists its tools.

Example response

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

{
  "grade": "B",
  "latency_ms": {
    "total": 361
  },
  "protocol_version": "2025-06-18",
  "tools": 31,
  "verdict": "ok"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.youraitools.co/toolfit/v1/check?url=https%3A%2F%2Fapi.youraitools.co%2Fmcp%2Fhub'

# 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.youraitools.co/toolfit/v1/check?url=https%3A%2F%2Fapi.youraitools.co%2Fmcp%2Fhub' \
  | 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.youraitools.co%2Ftoolfit%2Fv1%2Fcheck
const res = await pay("https://api.youraitools.co/toolfit/v1/check?url=https%3A%2F%2Fapi.youraitools.co%2Fmcp%2Fhub");
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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
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.youraitools.co/toolfit/v1/check?url=https%3A%2F%2Fapi.youraitools.co%2Fmcp%2Fhub")
    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
2 h agoPassed40229 ms$0.005
9 h agoPassed40280 ms$0.005
17 h agoPassed40223 ms$0.005
25 h agoPassed40215 ms$0.005
33 h agoPassed402277 ms$0.005
Show 9 older checks
40 h agoPassed40228 ms$0.005
2 days agoPassed40238 ms$0.005
2 days agoPassed40239 ms$0.005
3 days agoPassed40221 ms$0.005
3 days agoPassed40235 ms$0.005
3 days agoPassed40223 ms$0.005
3 days agoPassed40291 ms$0.005
4 days agoPassed40225 ms$0.005
4 days agoPassed40213 ms$0.005