ToolVet
80trust / 100

Contract Check

by Forest Agent Tools in Onchain & crypto

x402 APIPassing, checked 4 h ago

Inspect one public MCP HTTP endpoint, auto-detect the stateless 2026-07-28 era or fall back to the legacy initialize lifecycle, then normalize tools/list schemas into a deterministic SHA-256 contract fingerprint. Forest never invokes an advertised tool or attempts authentication. Base mainnet USDC

POST https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/mcp/contract-check

Last 30 days

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed

Uptime
100%
Response time
133 ms typical, 218 ms slowest 5%
Last check
4 h ago
Next check
any minute now

How to call it

POST https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/mcp/contract-check

Each call costs $0.004 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://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/mcp/contract-check
content-type: application/json

{
  "url": "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/fixtures/mcp"
}

Parameters

ParameterTypeRequiredDescription
protocol_versionstringNoPublic protocol version value used to scope this lookup.
urlstringYesPublic HTTP(S) URL to inspect, resolve, or compare.

Example response

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

Example response, 29 lines
{
  "capability": "mcp.contract-check",
  "data": {
    "auth_required": false,
    "capabilities": [],
    "invalid_tool_count": 0,
    "latency_ms": 0,
    "protocol_era": "modern",
    "protocol_version": "example",
    "reachable": false,
    "schema_valid": false,
    "scope": "mcp_protocol_discovery_and_tools_schema_contract_only",
    "tool_count": 0,
    "tools": [],
    "tools_hash": "0000000000000000000000000000000000000000000000000000000000000000",
    "transport": "http-jsonrpc",
    "truncated": false,
    "url": "example",
    "warnings": []
  },
  "meta": {
    "cache": "miss",
    "checked_at": "2026-01-01T00:00:00.000Z",
    "duration_ms": 0,
    "provider": "mcp-contract"
  },
  "ok": true,
  "version": "1"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.004.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/mcp/contract-check' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/fixtures/mcp"}'

# 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://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/mcp/contract-check' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/fixtures/mcp"}' \
  | 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 $0.004 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.004" });
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 $0.004 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fhttp--forest-gas-station-mainnet--lcjl27p8lmjs.code.run%2Fmcp%2Fcontract-check&method=POST
const res = await pay("https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/mcp/contract-check", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "url": "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/fixtures/mcp"
  }),
});
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 $0.004 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.004"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/mcp/contract-check",
        json={
            "url": "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/fixtures/mcp",
        },
    )
    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 agoPassed40238 ms$0.004
8 h agoPassed402115 ms$0.004
12 h agoPassed402134 ms$0.004
15 h agoPassed402133 ms$0.004
19 h agoPassed40239 ms$0.004
23 h agoPassed40240 ms$0.004
27 h agoPassed402150 ms$0.004
30 h agoPassed40245 ms$0.004
34 h agoPassed402133 ms$0.004
38 h agoPassed402218 ms$0.004
41 h agoPassed402158 ms$0.004
45 h agoPassed402188 ms$0.004
2 days agoPassed402157 ms$0.004
2 days agoPassed40240 ms$0.004
2 days agoPassed402160 ms$0.004