80trust / 100

X402 Catalog Drift Monitor

by api.blockchainmoneymap.com in Developer tools

x402 APIPassing, checked 2 h ago

Compares caller-supplied x402 catalog, OpenAPI, MCP/tool metadata, and unpaid challenge samples for endpoint, method, price, currency, network, receiver, and tool drift.

POST https://api.blockchainmoneymap.com/api/x402/x402-catalog-drift-monitor

Last 30 days

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Status and outage history · Atom feed

Uptime: 100%
Response time: 284 ms typical, 335 ms slowest 5%
Last check: 2 h ago
Next check: any minute now

How to call it

POST https://api.blockchainmoneymap.com/api/x402/x402-catalog-drift-monitor

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-catalog-drift-monitor
content-type: application/json

{
  "catalog_json": {
    "resources": [
      {
        "id": "wallet_snapshot",
        "method": "POST",
        "path": "/api/x402/wallet-snapshot",
        "price": {
          "amount": "0.01",
          "currency": "USDC",
          "network": "base",
          "receiver": "0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a"
        }
      }
    ]
  },
  "expected_currency": "USDC",
  "expected_endpoint": "/api/x402/wallet-snapshot",
  "expected_method": "POST",
  "expected_network": "base",
  "expected_price": "0.01",
  "expected_receiver": "0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a",
  "expected_tool_id": "wallet_snapshot",
  "openapi_json": {
    "paths": {
      "/api/x402/wallet-snapshot": {
        "post": {
          "operationId": "wallet_snapshot"
        }
      }
    }
  },
  "payment_challenge_json": {
    "x402": {
      "amount": "0.01",
      "currency": "USDC",
      "network": "base",
      "payTo": "0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a",
      "resource": "/api/x402/wallet-snapshot"
    }
  },
  "service_url": "https://api.blockchainmoneymap.com"
}

Parameters

Parameter	Type	Required	Description
`catalog_json`	object	No
`expected_currency`	string	No
`expected_endpoint`	string	Yes	Root-relative endpoint path expected by the buyer agent.
`expected_method`	string	No	One of: GET, POST. Default: "POST".
`expected_network`	string	No
`expected_price`	string	No
`expected_receiver`	string	No
`expected_tool_id`	string	No
`mcp_tool_name`	string	No
`openapi_json`	object	No
`payment_challenge_json`	object	No
`service_url`	string (uri)	Yes	Public HTTPS service URL used only as a sanitized label in v1.

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-catalog-drift-monitor' \
  -H 'content-type: application/json' \
  --data-raw '{"catalog_json":{"resources":[{"id":"wallet_snapshot","method":"POST","path":"/api/x402/wallet-snapshot","price":{"amount":"0.01","currency":"USDC","network":"base","receiver":"0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a"}}]},"expected_currency":"USDC","expected_endpoint":"/api/x402/wallet-snapshot","expected_method":"POST","expected_network":"base","expected_price":"0.01","expected_receiver":"0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a","expected_tool_id":"wallet_snapshot","openapi_json":{"paths":{"/api/x402/wallet-snapshot":{"post":{"operationId":"wallet_snapshot"}}}},"payment_challenge_json":{"x402":{"amount":"0.01","currency":"USDC","network":"base","payTo":"0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a","resource":"/api/x402/wallet-snapshot"}},"service_url":"https://api.blockchainmoneymap.com"}'

# 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-catalog-drift-monitor' \
  -H 'content-type: application/json' \
  --data-raw '{"catalog_json":{"resources":[{"id":"wallet_snapshot","method":"POST","path":"/api/x402/wallet-snapshot","price":{"amount":"0.01","currency":"USDC","network":"base","receiver":"0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a"}}]},"expected_currency":"USDC","expected_endpoint":"/api/x402/wallet-snapshot","expected_method":"POST","expected_network":"base","expected_price":"0.01","expected_receiver":"0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a","expected_tool_id":"wallet_snapshot","openapi_json":{"paths":{"/api/x402/wallet-snapshot":{"post":{"operationId":"wallet_snapshot"}}}},"payment_challenge_json":{"x402":{"amount":"0.01","currency":"USDC","network":"base","payTo":"0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a","resource":"/api/x402/wallet-snapshot"}},"service_url":"https://api.blockchainmoneymap.com"}' \
  | 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-catalog-drift-monitor&method=POST
const res = await pay("https://api.blockchainmoneymap.com/api/x402/x402-catalog-drift-monitor", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "catalog_json": {
      "resources": [
        {
          "id": "wallet_snapshot",
          "method": "POST",
          "path": "/api/x402/wallet-snapshot",
          "price": {
            "amount": "0.01",
            "currency": "USDC",
            "network": "base",
            "receiver": "0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a"
          }
        }
      ]
    },
    "expected_currency": "USDC",
    "expected_endpoint": "/api/x402/wallet-snapshot",
    "expected_method": "POST",
    "expected_network": "base",
    "expected_price": "0.01",
    "expected_receiver": "0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a",
    "expected_tool_id": "wallet_snapshot",
    "openapi_json": {
      "paths": {
        "/api/x402/wallet-snapshot": {
          "post": {
            "operationId": "wallet_snapshot"
          }
        }
      }
    },
    "payment_challenge_json": {
      "x402": {
        "amount": "0.01",
        "currency": "USDC",
        "network": "base",
        "payTo": "0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a",
        "resource": "/api/x402/wallet-snapshot"
      }
    },
    "service_url": "https://api.blockchainmoneymap.com"
  }),
});
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-catalog-drift-monitor",
        json={
            "catalog_json": {
                "resources": [
                    {
                        "id": "wallet_snapshot",
                        "method": "POST",
                        "path": "/api/x402/wallet-snapshot",
                        "price": {
                            "amount": "0.01",
                            "currency": "USDC",
                            "network": "base",
                            "receiver": "0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a",
                        },
                    },
                ],
            },
            "expected_currency": "USDC",
            "expected_endpoint": "/api/x402/wallet-snapshot",
            "expected_method": "POST",
            "expected_network": "base",
            "expected_price": "0.01",
            "expected_receiver": "0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a",
            "expected_tool_id": "wallet_snapshot",
            "openapi_json": {
                "paths": {
                    "/api/x402/wallet-snapshot": {
                        "post": {
                            "operationId": "wallet_snapshot",
                        },
                    },
                },
            },
            "payment_challenge_json": {
                "x402": {
                    "amount": "0.01",
                    "currency": "USDC",
                    "network": "base",
                    "payTo": "0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a",
                    "resource": "/api/x402/wallet-snapshot",
                },
            },
            "service_url": "https://api.blockchainmoneymap.com",
        },
    )
    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

When	Result	HTTP	Time	Price
2 h ago	Passed	402	276 ms	$0.01
5 h ago	Passed	402	303 ms	$0.01
9 h ago	Passed	402	252 ms	$0.01
13 h ago	Passed	402	201 ms	$0.01
17 h ago	Passed	402	299 ms	$0.01
21 h ago	Passed	402	320 ms	$0.01
25 h ago	Passed	402	245 ms	$0.01
28 h ago	Passed	402	268 ms	$0.01
32 h ago	Passed	402	335 ms	$0.01
35 h ago	Passed	402	269 ms	$0.01
39 h ago	Passed	402	297 ms	$0.01
43 h ago	Passed	402	242 ms	$0.01
46 h ago	Passed	402	313 ms	$0.01
2 days ago	Passed	402	327 ms	$0.01
2 days ago	Passed	402	308 ms	$0.01

Trust score 80

Availability (30-day uptime)		30 / 30
Valid x402 challenge		15 / 15
Response time		10 / 10
Real paying agents (30 days)		5 / 15
Charges what it lists		10 / 10
Security scan		10 / 10
Verified owner		0 / 10

How the score works

Payment terms

Price: $0.01 per call
Listed at: $0.01
Token: USDC
Networks: Base
Pays to: 0x2211…713a

Real usage

Paying agents: 2 in 30 days
Paid calls: 2 in 30 days
Last paid call: 9 days ago

Source: x402 Bazaar settlement data.

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[![ToolVet trust score](https://toolvet.app/badge/x402-catalog-drift-monitor.svg)](https://toolvet.app/s/x402-catalog-drift-monitor)