X402 Agent Wallet Spend Policy Simulator

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.blockchainmoneymap.com/api/x402/x402-agent-wallet-spend-policy-simulator' \
  -H 'content-type: application/json' \
  --data-raw '{"facts":{"allowed_assets":["USDC"],"allowed_chains":["eip155:8453"],"allowed_counterparties":["Blockchain Money Map"],"intended_task":"buy wallet intelligence reports","recurrence":"repeat paid calls","retry_policy":"one retry with same payment identifier","spend_caps":{"daily_usd":1,"per_call_usd":0.01},"time_window":{"period":"daily","valid_until":"2026-07-23T00:00:00.000Z"},"workload_description":"25 paid report calls per day"},"mode":"analyze"}'

# 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-agent-wallet-spend-policy-simulator' \
  -H 'content-type: application/json' \
  --data-raw '{"facts":{"allowed_assets":["USDC"],"allowed_chains":["eip155:8453"],"allowed_counterparties":["Blockchain Money Map"],"intended_task":"buy wallet intelligence reports","recurrence":"repeat paid calls","retry_policy":"one retry with same payment identifier","spend_caps":{"daily_usd":1,"per_call_usd":0.01},"time_window":{"period":"daily","valid_until":"2026-07-23T00:00:00.000Z"},"workload_description":"25 paid report calls per day"},"mode":"analyze"}' \
  | 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-agent-wallet-spend-policy-simulator&method=POST
const res = await pay("https://api.blockchainmoneymap.com/api/x402/x402-agent-wallet-spend-policy-simulator", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "facts": {
      "allowed_assets": [
        "USDC"
      ],
      "allowed_chains": [
        "eip155:8453"
      ],
      "allowed_counterparties": [
        "Blockchain Money Map"
      ],
      "intended_task": "buy wallet intelligence reports",
      "recurrence": "repeat paid calls",
      "retry_policy": "one retry with same payment identifier",
      "spend_caps": {
        "daily_usd": 1,
        "per_call_usd": 0.01
      },
      "time_window": {
        "period": "daily",
        "valid_until": "2026-07-23T00:00:00.000Z"
      },
      "workload_description": "25 paid report calls per day"
    },
    "mode": "analyze"
  }),
});
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-agent-wallet-spend-policy-simulator",
        json={
            "facts": {
                "allowed_assets": [
                    "USDC",
                ],
                "allowed_chains": [
                    "eip155:8453",
                ],
                "allowed_counterparties": [
                    "Blockchain Money Map",
                ],
                "intended_task": "buy wallet intelligence reports",
                "recurrence": "repeat paid calls",
                "retry_policy": "one retry with same payment identifier",
                "spend_caps": {
                    "daily_usd": 1,
                    "per_call_usd": 0.01,
                },
                "time_window": {
                    "period": "daily",
                    "valid_until": "2026-07-23T00:00:00.000Z",
                },
                "workload_description": "25 paid report calls per day",
            },
            "mode": "analyze",
        },
    )
    print(res.status_code, res.text)