X402 Spend Permission Allowance Fit Checker

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.blockchainmoneymap.com/api/x402/x402-spend-permission-allowance-fit-checker' \
  -H 'content-type: application/json' \
  --data-raw '{"facts":{"allowance_unit":"USDC","allowed_chains":["eip155:8453"],"allowed_counterparties":["Blockchain Money Map"],"amount_cap":1,"intended_workload":"50 penny paid calls","recurrence":"daily","spender_role":"buyer-agent runtime","time_window":{"period":"daily"},"token":"USDC"},"mode":"check"}'

# 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.blockchainmoneymap.com/api/x402/x402-spend-permission-allowance-fit-checker' \
  -H 'content-type: application/json' \
  --data-raw '{"facts":{"allowance_unit":"USDC","allowed_chains":["eip155:8453"],"allowed_counterparties":["Blockchain Money Map"],"amount_cap":1,"intended_workload":"50 penny paid calls","recurrence":"daily","spender_role":"buyer-agent runtime","time_window":{"period":"daily"},"token":"USDC"},"mode":"check"}' \
  | 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%2Fapi.blockchainmoneymap.com%2Fapi%2Fx402%2Fx402-spend-permission-allowance-fit-checker&method=POST
const res = await pay("https://api.blockchainmoneymap.com/api/x402/x402-spend-permission-allowance-fit-checker", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "facts": {
      "allowance_unit": "USDC",
      "allowed_chains": [
        "eip155:8453"
      ],
      "allowed_counterparties": [
        "Blockchain Money Map"
      ],
      "amount_cap": 1,
      "intended_workload": "50 penny paid calls",
      "recurrence": "daily",
      "spender_role": "buyer-agent runtime",
      "time_window": {
        "period": "daily"
      },
      "token": "USDC"
    },
    "mode": "check"
  }),
});
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.post(
        "https://api.blockchainmoneymap.com/api/x402/x402-spend-permission-allowance-fit-checker",
        json={
            "facts": {
                "allowance_unit": "USDC",
                "allowed_chains": [
                    "eip155:8453",
                ],
                "allowed_counterparties": [
                    "Blockchain Money Map",
                ],
                "amount_cap": 1,
                "intended_workload": "50 penny paid calls",
                "recurrence": "daily",
                "spender_role": "buyer-agent runtime",
                "time_window": {
                    "period": "daily",
                },
                "token": "USDC",
            },
            "mode": "check",
        },
    )
    print(res.status_code, res.text)