🏗️ Build for the x402 Global Challenge

$100K+ Prize Pool

PreHack: Aug 23, Bengaluru · Global Challenge ongoing

Build an x402 service → List it on minia2a → 115 AI agents discover it instantly

The x402 Global Challenge is the biggest hackathon in agent payment history — $100K+ in prizes, backed by the Linux Foundation x402 group (Visa, Mastercard, Stripe, Coinbase, Google, AWS, Ripple, and 34 others). The PreHack in Bengaluru on August 23 kicks off a worldwide builder sprint.

minia2a.uk is the largest x402 service marketplace — 1,674 services, 34 wallet users, 2485K requests processed. Listing your hackathon project here means real AI agents discover and use your service during the competition.

🚀 3 Steps: Build, List, Win

Build your x402 endpoint

Wrap any API or function behind an HTTP 402 payment wall. Return 402 Payment Required with x402 V2 headers (amount, asset, payTo). Accept USDC on Base. Here's a minimal Node.js example:

// Minimal x402 endpoint in Node.js + Express
const express = require('express');
const app = express();

app.get('/my-service', (req, res) => {
  // Step 1: Check for payment header
  const payment = req.headers['x402-payment-signature'];
  if (!payment) {
    // Step 2: Return 402 with payment details
    return res.status(402).json({
      x402Version: 2,
      accepts: [{
        scheme: 'exact',
        network: 'eip155:8453', // Base
        maxAmountRequired: '5000',  // $0.005 USDC
        amount: '5000',
        asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913', // USDC on Base
        payTo: '0xYOUR_WALLET'
      }]
    });
  }
  // Step 3: Verify payment, then serve
  res.json({ result: 'Hello from your x402 service!' });
});

Full developer guide → · Coinbase x402 SDK →

List it on minia2a (1 command)

Register your service and it becomes instantly discoverable by 115+ AI agents browsing the marketplace. Your service shows up in search results, the MCP catalog, and the live API directory.

# Register your x402 service on minia2a
curl -X POST https://minia2a.uk/api/v1/publish-service \
  -H "content-type: application/json" \
  -d '{
    "name": "my-hackathon-service",
    "description": "What it does — be specific, agents read this",
    "endpoint": "https://your-server.com/my-service",
    "price_cents": 50,
    "category": "tools",
    "wallet": "0xYOUR_WALLET",
    "signature": "0xYOUR_SIGNATURE"
  }'

Your service gets: free trial allocation (agents try before buying) · MCP tool exposure (Claude Code, Cursor can call it) · discovery endpoints (/.well-known/x402, /api/services) · 5% platform fee only on paid calls.

Get real usage during judging

Judges at the x402 Global Challenge care about real usage, not just code. A service listed on minia2a shows:

✅ Live endpoint responding to 402 challenges
✅ Trial usage by actual AI agents (not simulated)
✅ Production x402 compliance verified by the marketplace
✅ Discoverable via /.well-known/x402, MCP, and OpenAPI

📊 Why minia2a?

Real marketplace, not a demo

1,674 services listed. 34 wallet users. 2485K requests processed. 42,979 free trials completed. Agents actually browse, discover, and call services here — your hackathon project gets real traffic during the competition.

Free to list, 5% on paid calls

No upfront cost. No subscription. You only pay when agents actually pay you — 5% of the transaction. During the hackathon, trials are free, so you can demonstrate real usage without anyone paying.

MCP + x402 = maximum reach

Every service on minia2a is exposed as an MCP tool. AI coding agents (Claude Code, Cursor, Copilot) can discover and call your service directly. Combined with x402 payments, this is the complete agent-to-agent commerce stack.

🛠️ Quick Links for Hackathon Builders

x402 Developer Guide 🛠️ Hackathon Starter Kit (GitHub) Register & List Service AGENTS.md

x402 protocol help → · MCP + x402 guide → · Coinbase x402 SDK → · x402.org → · Try free demos →