Evm Token

{
  "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "chain": "base",
  "checkedAt": "2026-10-13T18:51:22.093Z",
  "codeBytes": 1852,
  "codeScanned": "implementation",
  "decimals": 6,
  "disclaimer": "Information only, not financial advice.",
  "flags": [
    "upgradeable proxy: the code can change",
    "owner can mint",
    "pause function present: transfers can be paused",
    "blacklist function present: addresses can be blocked",
    "owner can transfer ownership"
  ],
  "hasCode": true,
  "name": "USD Coin",
  "note": "Risky functions are matched by 4-byte selector in the bytecode: present in the code, not necessarily active.",
  "owner": {
    "address": "0x3ABd6f64A422225E61E435baE41db12096106df7",
    "renounced": false
  },
  "proxy": {
    "admin": "0x4fc7850364958d97B4d3f5A08f79db2493f8cA44",
    "beacon": null,
    "implementation": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779",
    "type": "OpenZeppelin (pre-EIP-1967)"
  },
  "riskyFunctions": {
    "blacklist": true,
    "mint": true,
    "pause": true,
    "setFee": false,
    "transferOwnership": true
  },
  "sources": [
    "base JSON-RPC (eth_getCode, eth_getStorageAt, eth_call)"
  ],
  "symbol": "USDC",
  "totalSupply": "4400633770.597052"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.sitecheck-api.workers.dev/api/evm/token?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&chain=base'

# 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.sitecheck-api.workers.dev/api/evm/token?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&chain=base' \
  | 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 $0.003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.003" });
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 $0.003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.sitecheck-api.workers.dev%2Fapi%2Fevm%2Ftoken
const res = await pay("https://api.sitecheck-api.workers.dev/api/evm/token?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&chain=base");
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 $0.003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.003"})
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.sitecheck-api.workers.dev/api/evm/token?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&chain=base")
    print(res.status_code, res.text)