ToolVet
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X402 Response Contract Linter

by api.blockchainmoneymap.com in Onchain & crypto

x402 APIPassing, checked 2 h ago

Lints caller-submitted agent API, MCP, and x402 response samples for machine-actionable contract completeness without making network calls.

POST https://api.blockchainmoneymap.com/api/x402/x402-response-contract-linter

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Status and outage history · Atom feed

Uptime
100%
Response time
348 ms typical, 1.0 s slowest 5%
Last check
2 h ago
Next check
any minute now

How to call it

POST https://api.blockchainmoneymap.com/api/x402/x402-response-contract-linter

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.

POST https://api.blockchainmoneymap.com/api/x402/x402-response-contract-linter
content-type: application/json

{
  "lint_profile": "x402",
  "response_sample": {
    "confidence": "high",
    "decision": "pass",
    "endpoint": "x402-response-contract-linter",
    "generated_at": "2026-07-21T12:00:00.000Z",
    "limitations": [
      "Example only."
    ],
    "metadata": {
      "paymentStatus": "not_required"
    },
    "product_family": "agent_expansion_v3_api",
    "recommended_next_action": "Keep REST, MCP, OpenAPI, and discovery response fields stable.",
    "request_id": "req_example",
    "risk_flags": [],
    "summary": "Example machine-actionable response.",
    "tool_id": "x402_response_contract_linter",
    "version": "v0.1",
    "x402_request_id": "x402_req_example"
  },
  "tool_context": {
    "currency": "USDC",
    "endpoint_path": "/api/x402/wallet-snapshot",
    "expected_price": "0.01",
    "mcp_tool_name": "bmm_wallet_snapshot",
    "network": "base",
    "operation_id": "wallet_snapshot",
    "tool_id": "wallet_snapshot"
  }
}

Parameters

ParameterTypeRequiredDescription
lint_profilestringNo One of: api, mcp, x402, auto.
response_sampleobjectYes
schema_sampleobjectNo
tool_contextobjectNo

Example response

The listing has no example response.

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 -X POST 'https://api.blockchainmoneymap.com/api/x402/x402-response-contract-linter' \
  -H 'content-type: application/json' \
  --data-raw '{"lint_profile":"x402","response_sample":{"confidence":"high","decision":"pass","endpoint":"x402-response-contract-linter","generated_at":"2026-07-21T12:00:00.000Z","limitations":["Example only."],"metadata":{"paymentStatus":"not_required"},"product_family":"agent_expansion_v3_api","recommended_next_action":"Keep REST, MCP, OpenAPI, and discovery response fields stable.","request_id":"req_example","risk_flags":[],"summary":"Example machine-actionable response.","tool_id":"x402_response_contract_linter","version":"v0.1","x402_request_id":"x402_req_example"},"tool_context":{"currency":"USDC","endpoint_path":"/api/x402/wallet-snapshot","expected_price":"0.01","mcp_tool_name":"bmm_wallet_snapshot","network":"base","operation_id":"wallet_snapshot","tool_id":"wallet_snapshot"}}'

# 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://api.blockchainmoneymap.com/api/x402/x402-response-contract-linter' \
  -H 'content-type: application/json' \
  --data-raw '{"lint_profile":"x402","response_sample":{"confidence":"high","decision":"pass","endpoint":"x402-response-contract-linter","generated_at":"2026-07-21T12:00:00.000Z","limitations":["Example only."],"metadata":{"paymentStatus":"not_required"},"product_family":"agent_expansion_v3_api","recommended_next_action":"Keep REST, MCP, OpenAPI, and discovery response fields stable.","request_id":"req_example","risk_flags":[],"summary":"Example machine-actionable response.","tool_id":"x402_response_contract_linter","version":"v0.1","x402_request_id":"x402_req_example"},"tool_context":{"currency":"USDC","endpoint_path":"/api/x402/wallet-snapshot","expected_price":"0.01","mcp_tool_name":"bmm_wallet_snapshot","network":"base","operation_id":"wallet_snapshot","tool_id":"wallet_snapshot"}}' \
  | 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%2Fapi.blockchainmoneymap.com%2Fapi%2Fx402%2Fx402-response-contract-linter&method=POST
const res = await pay("https://api.blockchainmoneymap.com/api/x402/x402-response-contract-linter", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "lint_profile": "x402",
    "response_sample": {
      "confidence": "high",
      "decision": "pass",
      "endpoint": "x402-response-contract-linter",
      "generated_at": "2026-07-21T12:00:00.000Z",
      "limitations": [
        "Example only."
      ],
      "metadata": {
        "paymentStatus": "not_required"
      },
      "product_family": "agent_expansion_v3_api",
      "recommended_next_action": "Keep REST, MCP, OpenAPI, and discovery response fields stable.",
      "request_id": "req_example",
      "risk_flags": [],
      "summary": "Example machine-actionable response.",
      "tool_id": "x402_response_contract_linter",
      "version": "v0.1",
      "x402_request_id": "x402_req_example"
    },
    "tool_context": {
      "currency": "USDC",
      "endpoint_path": "/api/x402/wallet-snapshot",
      "expected_price": "0.01",
      "mcp_tool_name": "bmm_wallet_snapshot",
      "network": "base",
      "operation_id": "wallet_snapshot",
      "tool_id": "wallet_snapshot"
    }
  }),
});
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.post(
        "https://api.blockchainmoneymap.com/api/x402/x402-response-contract-linter",
        json={
            "lint_profile": "x402",
            "response_sample": {
                "confidence": "high",
                "decision": "pass",
                "endpoint": "x402-response-contract-linter",
                "generated_at": "2026-07-21T12:00:00.000Z",
                "limitations": [
                    "Example only.",
                ],
                "metadata": {
                    "paymentStatus": "not_required",
                },
                "product_family": "agent_expansion_v3_api",
                "recommended_next_action": "Keep REST, MCP, OpenAPI, and discovery response fields stable.",
                "request_id": "req_example",
                "risk_flags": [],
                "summary": "Example machine-actionable response.",
                "tool_id": "x402_response_contract_linter",
                "version": "v0.1",
                "x402_request_id": "x402_req_example",
            },
            "tool_context": {
                "currency": "USDC",
                "endpoint_path": "/api/x402/wallet-snapshot",
                "expected_price": "0.01",
                "mcp_tool_name": "bmm_wallet_snapshot",
                "network": "base",
                "operation_id": "wallet_snapshot",
                "tool_id": "wallet_snapshot",
            },
        },
    )
    print(res.status_code, res.text)

Security scan

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