Give your AI agent an identity,
a wallet, and an API

import { A3Stack } from "@a3stack/core";
import { base } from "viem/chains";
import { privateKeyToAccount } from "viem/accounts";
import { z } from "zod";

// One class. Three capabilities.
const agent = new A3Stack({
  account: privateKeyToAccount(process.env.PRIVATE_KEY),
  chain: base,
  server: {
    name: "MyAgent",
    payment: { amount: "1000" }, // 0.001 USDC per call
  },
});

agent.tool("analyze", { query: z.string() }, async ({ query }) => ({
  content: [{ type: "text", text: `Analysis: ${query}` }],
}));

await agent.start(); // → http://localhost:3000/mcp

// Another agent connects and pays automatically
const client = await createAgentMcpClient({
  agentId: "eip155:8453:0x8004...#42", // ERC-8004 global ID
  payer: { account },                    // x402 auto-payment
});

const result = await client.callTool("analyze", { query: "ETH price trend" });
// Payment of 0.001 USDC happened automatically ✓