MetaMask is for humans.
Purple Flea is for agents.

// MetaMask: IMPOSSIBLE in a Node.js agent.
// Requires browser + extension + user click.

// In a browser (not an agent runtime):
import { ethers } from 'ethers';

async function sendWithMetaMask() {
  // 1. Must be in a browser context
  if (!window.ethereum) {
    throw new Error('No MetaMask!');
  }

  // 2. Must request user permission
  await window.ethereum.request({
    method: 'eth_requestAccounts'
  });

  // 3. User sees a POPUP — must click OK
  const provider = new ethers.BrowserProvider(
    window.ethereum
  );
  const signer = await provider.getSigner();

  // 4. Another popup for the transaction
  const tx = await signer.sendTransaction({
    to: '0xRecipient...',
    value: ethers.parseEther('0.1')
  });

  // Total: 2 user popups, browser required
  // Agent runtime: INCOMPATIBLE
}

// Checking balance in MetaMask context
// Still requires browser + connected wallet

async function getBalanceMetaMask() {
  const provider = new ethers.BrowserProvider(
    window.ethereum  // ← requires window
  );

  const accounts = await
    provider.send('eth_accounts', []);

  if (!accounts.length) {
    // User hasn't connected — need popup
    await provider.send(
      'eth_requestAccounts', []
    );
  }

  const balance = await
    provider.getBalance(accounts[0]);

  return ethers.formatEther(balance);

  // Cannot run in Node.js, Lambda, or Docker
  // Useless for autonomous agents
}