// Create wallet (not deployed yet!)
const wallet = await crossmintWallets.createWallet({
  chain: "base-sepolia",
  signer: { type: "api-key" }
});

console.log(wallet.address); // 0x123... (counterfactual address)

// Can sign payments before deployment
const signature = await wallet.signTypedData({
  domain: { chainId: 84532, ... },
  types: { Payment: [...] },
  message: { amount: "50000", to: "0xabc...", ... }
});
// Returns ERC-6492 signature (includes deployment bytecode)

// First payment auto-deploys the wallet
const tx = await facilitator.settle(signature);
// Wallet is now deployed and owns itself!

// User registration creates URL-safe hash
const urlSafeId = await hashUserId(email); // "a3f2c1b4..."

// Store user mapping
await env.SECRETS.put(`users:${email}`, JSON.stringify({
  userId: email,
  walletAddress: wallet.address,
  urlSafeId
}));

await env.SECRETS.put(`usersByHash:${urlSafeId}`, ...);

// Events scoped by urlSafeId
await env.SECRETS.put(
  `${urlSafeId}:events:${eventId}`,
  JSON.stringify(eventData)
);

// Revenue tracking
await env.SECRETS.put(
  `${urlSafeId}:revenue`,
  totalRevenue.toString()
);

User A → /mcp/users/a3f2c1b4 → Host DO (name: "a3f2c1b4")
                                 ├─ wallet: 0xAAA...
                                 ├─ events: [event1, event2]
                                 └─ revenue: $12.50

User B → /mcp/users/b8e9d6f1 → Host DO (name: "b8e9d6f1")
                                 ├─ wallet: 0xBBB...
                                 ├─ events: [event3]
                                 └─ revenue: $3.00

// List events (no payment required)
this.server.tool(
  "listEvents",
  "List all available events",
  {},
  {},
  async () => {
    const events = await eventService.listEvents();
    return { events };
  }
);

// RSVP requires $0.05 payment
this.server.paidTool(
  "rsvpToEvent",
  "RSVP to an event",
  0.05,
  { eventId: z.string() },
  {},
  async ({ eventId }, tx) => {
    // Payment already verified!
    await recordRsvp(eventId, tx);
  }
);

// Get event stats for $0.01
this.server.paidTool(
  "getEventAnalytics",
  "Get detailed event analytics",
  0.01,
  { eventId: z.string() },
  {},
  async ({ eventId }) => {
    const rsvps = await getRsvps(eventId);
    return {
      totalRsvps: rsvps.length,
      totalRevenue: rsvps.reduce((sum, r) => sum + parseFloat(r.amount), 0),
      rsvps
    };
  }
);