Deep

{
  "address": "0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D",
  "chain": {
    "block": 50804109,
    "chain": 8453,
    "isContract": false,
    "name": "Base",
    "native": "0.0026",
    "outgoingTxs": 3,
    "reachable": true,
    "usdc": "30.23",
    "usdcUnits": "30230079",
    "usdt": "0.00",
    "usdtUnits": "0"
  },
  "checksum": {
    "message": "Valid EIP-55 checksum address.",
    "status": "valid"
  },
  "meta": {
    "ms": 2140,
    "service": "sendcheck",
    "version": "1.8.1"
  },
  "others": [
    {
      "chain": 1,
      "isContract": false,
      "name": "Ethereum",
      "native": "0.0",
      "outgoingTxs": 12,
      "reachable": true,
      "usdc": "0.00",
      "usdt": "0.00"
    }
  ],
  "report": "SendCheck deep scan …",
  "verdict": {
    "gas": "0.00000039 ETH",
    "headline": "Address is more active on Ethereum than on Base.",
    "level": "warn",
    "next": "Confirm you truly mean Base before sending.",
    "reasons": [
      "…"
    ],
    "tokenMismatch": null
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.pennyforge.org/deep' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D","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 - -X POST 'https://api.pennyforge.org/deep' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D","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 $0.05 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.05" });
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 $0.05 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.pennyforge.org%2Fdeep&method=POST
const res = await pay("https://api.pennyforge.org/deep", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D",
    "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 $0.05 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.05"})
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.pennyforge.org/deep",
        json={
            "address": "0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D",
            "chain": "base",
        },
    )
    print(res.status_code, res.text)