Audit

{
  "bazaar": {
    "calls_30d": 12,
    "checked": true,
    "listed": true,
    "merchant_resources": 480,
    "unique_payers_30d": 3
  },
  "checks": {
    "bazaar_discovery_extension": true,
    "reachable": "3/3 probes answered",
    "returns_402": "3/3 returned a parseable 402 challenge",
    "terms_stable_across_probes": true
  },
  "flags": [],
  "latency_ms": {
    "max": 260,
    "median": 210,
    "min": 180,
    "probes": [
      180,
      210,
      260
    ]
  },
  "scope": "three unpaid probes plus the public Coinbase discovery record; it does not pay the endpoint, so delivery after payment is not verified",
  "score": 100,
  "url": "https://saylorinnovations.com/api/x402/ping",
  "verdict": "healthy"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://saylorinnovations.com/api/audit/x402?url=https%3A%2F%2Fsaylorinnovations.com%2Fapi%2Fx402%2Fping'

# 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://saylorinnovations.com/api/audit/x402?url=https%3A%2F%2Fsaylorinnovations.com%2Fapi%2Fx402%2Fping' \
  | 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 $0.01 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%2Fsaylorinnovations.com%2Fapi%2Faudit%2Fx402
const res = await pay("https://saylorinnovations.com/api/audit/x402?url=https%3A%2F%2Fsaylorinnovations.com%2Fapi%2Fx402%2Fping");
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 $0.01 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.get("https://saylorinnovations.com/api/audit/x402?url=https%3A%2F%2Fsaylorinnovations.com%2Fapi%2Fx402%2Fping")
    print(res.status_code, res.text)