Signcheck Lite

{
  "action": "erc20_approve",
  "chain": {
    "id": 8453,
    "name": "Base"
  },
  "counterparties": [
    {
      "address": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F",
      "label": null,
      "roles": [
        "spender"
      ],
      "type": "eoa"
    }
  ],
  "engine": "signcheck-0.1",
  "flags": [
    {
      "code": "SPENDER_IS_EOA",
      "message": "The token allowance goes to 0x3c1A…8d6F, a plain wallet (no contract code). Legitimate apps approve contracts; approvals to wallets are how drainer kits steal funds.",
      "severity": "critical"
    },
    {
      "code": "UNLIMITED_APPROVAL",
      "message": "Grants an UNLIMITED allowance to 0x3c1A…8d6F.",
      "severity": "medium"
    }
  ],
  "kind": "transaction",
  "onchain": {
    "available": true,
    "block": 52942270,
    "chain": "Base",
    "simulation": {
      "success": true
    },
    "tokens": [
      {
        "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "decimals": 6,
        "name": "USD Coin",
        "symbol": "USDC"
      }
    ]
  },
  "risk_score": 75,
  "sanctions": {
    "evm_addresses": 124,
    "list": "US Treasury OFAC Specially Designated Nationals (SDN) list",
    "list_date": "2026-10-21",
    "matches": 0
  },
  "summary": "Approve 0x3c1A…8d6F to spend UNLIMITED USDC from your wallet",
  "tier": "full",
  "verdict": "DANGER"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.youraitools.co/signcheck/v1/lite?chain=base&data=0x095ea7b30000000000000000000000003c1a1e01e790cd326495631b3b38bd7068f08d6fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff&from=0xE35E10429048b6F3409b0307E65e4797477Ed144&to=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'

# 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/signcheck/v1/lite?chain=base&data=0x095ea7b30000000000000000000000003c1a1e01e790cd326495631b3b38bd7068f08d6fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff&from=0xE35E10429048b6F3409b0307E65e4797477Ed144&to=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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%2Fsigncheck%2Fv1%2Flite
const res = await pay("https://api.youraitools.co/signcheck/v1/lite?chain=base&data=0x095ea7b30000000000000000000000003c1a1e01e790cd326495631b3b38bd7068f08d6fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff&from=0xE35E10429048b6F3409b0307E65e4797477Ed144&to=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913");
console.log(res.status, await res.text());

# 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/signcheck/v1/lite?chain=base&data=0x095ea7b30000000000000000000000003c1a1e01e790cd326495631b3b38bd7068f08d6fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff&from=0xE35E10429048b6F3409b0307E65e4797477Ed144&to=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913")
    print(res.status_code, res.text)