Check any token before you buy.

Four checks, one verdict

Every source can be wrong on its own. Sentinel combines them, so one missed flag doesn't slip through.

Check the agent before you pay it

AI agents now pay other agents for data, trades and services. Sentinel tells your agent whether the one on the other side is real: valid ERC-8004 registration, a card that points back to its on-chain ID, endpoints that are online, and an owner wallet that is not linked to scams. The same API checks tokens and wallets before a trade.

No sign-up, no API key. Your bot pays per check in USDT or USDC, directly on BNB Chain, using the x402 payment standard.

1. Your bot calls GET /v1/check/{address}. Sentinel answers HTTP 402 with the price and the wallet to pay.
2. Your bot sends 0.01 USDT or USDC to that wallet on BNB Chain.
3. It repeats the request with header X-PAYMENT-TX: <tx hash> and gets the full report: score, verdict, every reason, taxes, liquidity.

// npm i ethers
const { ethers } = require('ethers');
const API = 'https://api-sentinel.mfsmai.com';

async function sentinel(token, wallet) {
  const url = `${API}/v1/check/${token}`;
  const pay = (await (await fetch(url)).json()).txhash;     // HTTP 402: how to pay
  const usdt = new ethers.Contract(pay.assets[0].address,
    ['function transfer(address,uint256)'], wallet);
  const tx = await usdt.transfer(pay.payTo, pay.amountWei);   // 0.01 USDT
  await tx.wait();
  return (await fetch(url, { headers: { 'X-PAYMENT-TX': tx.hash } })).json();
}

const report = await sentinel('0xToken...', wallet);
if (report.verdict === 'DANGER') return;                       // skip the trade

# pip install web3 requests
import requests
from web3 import Web3

API = "https://api-sentinel.mfsmai.com"
w3 = Web3(Web3.HTTPProvider("https://bsc-dataseed.bnbchain.org"))
acct = w3.eth.account.from_key(PRIVATE_KEY)

def sentinel(token):
    url = f"{API}/v1/check/{token}"
    pay = requests.get(url).json()["txhash"]            # HTTP 402: how to pay
    usdt = w3.eth.contract(address=pay["assets"][0]["address"],
        abi=[{"name": "transfer", "type": "function", "outputs": [{"type": "bool"}],
              "inputs": [{"type": "address"}, {"type": "uint256"}]}])
    tx = usdt.functions.transfer(pay["payTo"], int(pay["amountWei"])).build_transaction(
        {"from": acct.address, "nonce": w3.eth.get_transaction_count(acct.address)})
    h = w3.eth.send_raw_transaction(acct.sign_transaction(tx).raw_transaction)
    w3.eth.wait_for_transaction_receipt(h)
    return requests.get(url, headers={"X-PAYMENT-TX": h.to_0x_hex()}).json()

{
  "kind": "token",
  "score": 5,
  "verdict": "DANGER",
  "reasons": [
    "Honeypot: you can buy but you cannot sell",
    "Sell tax 99%",
    "Brand new: trading started 14 min ago",
    "Almost no liquidity ($640)"
  ],
  "positives": [],
  "token": { "symbol": "MOON", "buyTax": 0, "sellTax": 99, "liquidityUsd": 640, "pairAge": "14 min" },
  "sources": ["bsc-rpc", "goplus", "honeypot.is", "dexscreener"]
}

Pay per check. Nothing else.

No subscription, no account. Every payment is a normal BNB Chain transfer you can see on BscScan.