Pocket Money — Fund Your Agent's Wallets

You have a tool that lets you create and manage crypto wallets (USDC on Base). Each wallet is a separate keypair with its own balance — create one per purpose or budget.

Package: @auteng/pocket-money — published by AutEng (source on GitHub).

Setup (first time only)

Install the pocket-money library:

npm install @auteng/pocket-money

Creating a Wallet

Create a named wallet for each purpose or budget:

import { wallet } from '@auteng/pocket-money';

const w = await wallet.create({ name: "feb-2026" });
console.log(w.address); // 0xABC123...

If a wallet with that name already exists on disk, it loads it. Each wallet is stored at .auteng/wallets/<name>.json.

You can also create a quick default wallet:

const w = await wallet.create();

Network

// Base mainnet (default)
const w = await wallet.create({ name: "prod" });

// Base Sepolia testnet
const w = await wallet.create({ name: "test", network: "base-sepolia" });

Requesting Funding

When you need money, ask your human to fund a specific wallet:

I need $12 in USDC for today's tasks.

Please send USDC on **Base** to this address:
`0xABC123...` (wallet: "feb-2026")

You can send from Coinbase, an exchange, or any wallet that supports Base.

Be specific about:

• How much you need and why (e.g., "$5 for API calls", "$20 for a batch processing job")
• Which wallet (by name) so both you and your human can track budgets
• The network: always Base (not Ethereum mainnet, not Arbitrum)
• The token: USDC (not ETH, not other tokens)

Waiting for Funding

After asking, wait for the USDC to arrive:

await w.waitForFunding(12_000000n);
// Polls Base every 10s until >= 12 USDC is available

With a timeout:

await w.waitForFunding(12_000000n, { timeout: 120_000 });
// Throws after 2 minutes if balance < $12

Tell your human you're waiting — they may need a minute to complete the transfer.

Human Approval Before Spending

IMPORTANT: Before making any payment, you MUST:

1. Tell your human exactly what you're about to spend and why
2. Show the estimated cost
3. Wait for explicit human approval before proceeding

Example:

I'd like to call an x402 API endpoint.

  Service: api.example.com/generate
  Cost:    ~$0.05 per request
  Wallet:  "feb-2026" ($0.98 remaining)

OK to proceed?

Never batch multiple paid operations without listing them first. If running a loop of paid calls, present the total estimated cost upfront and get approval for the batch.

Managing Wallets

// Retrieve an existing wallet by name
const w = wallet.get("feb-2026");

// List all wallets
const all = wallet.list();
for (const w of all) {
  const bal = await w.checkBalance();
  console.log(`${w.name}: ${w.address} — ${bal} USDC`);
}

// Check balance
const balance = await w.checkBalance();
// Returns USDC in minor units (6 decimals)
// e.g., 12_000000n = $12.00

If running low, ask your human for more funding before expensive operations.

Security & Storage

Private keys: Wallet private keys are stored as unencrypted JSON at .auteng/wallets/<name>.json with restricted file permissions (0600). These keys can sign USDC payment authorizations. If the file is leaked or the machine is compromised, funds in that wallet can be stolen. Treat wallet files like passwords.

Network access: This skill makes outbound HTTPS requests to:

• Base RPC (mainnet.base.org) — to check USDC balances

Mitigations:

• Always get human approval before any operation that spends funds
• Only fund wallets with small amounts appropriate for the task — treat them as petty cash, not savings
• Create separate wallets for separate budgets so you and your human can track spending
• Your wallets only need USDC on Base — no ETH needed for gas