From f9e36f93c2c80f30e24acad15dad943b02bca3e1 Mon Sep 17 00:00:00 2001
From: sam00101011 <239554522+sam00101011@users.noreply.github.com>
Date: Sun, 15 Mar 2026 20:06:58 +0900
Subject: [PATCH] Add x402 monetization (/.well-known/x402.json + middleware)

---
 .well-known/x402.json      | 12 ++++++++++++
 x402-middleware-example.ts | 25 +++++++++++++++++++++++++
 2 files changed, 37 insertions(+)
 create mode 100644 .well-known/x402.json
 create mode 100644 x402-middleware-example.ts

diff --git a/.well-known/x402.json b/.well-known/x402.json
new file mode 100644
index 0000000..5c23511
--- /dev/null
+++ b/.well-known/x402.json
@@ -0,0 +1,12 @@
+{
+  "name": "cablate/mcp-google-map",
+  "description": "A powerful Model Context Protocol (MCP) server providing comprehensive Google Maps API integration with LLM processing capabilities.",
+  "accepts": [
+    {
+      "network": "eip155:8453",
+      "asset": "USDC",
+      "address": "YOUR_WALLET_ADDRESS"
+    }
+  ],
+  "resources": []
+}
diff --git a/x402-middleware-example.ts b/x402-middleware-example.ts
new file mode 100644
index 0000000..ab52dda
--- /dev/null
+++ b/x402-middleware-example.ts
@@ -0,0 +1,25 @@
+// x402 payment middleware - add before your protected routes
+import { createPaymentMiddleware } from 'x402-express'; // or implement manually
+
+// Option A: use the x402-express package
+app.use('/api', createPaymentMiddleware({
+  walletAddress: process.env.X402_WALLET_ADDRESS,
+  network: 'eip155:8453', // Base mainnet
+  facilitatorUrl: 'https://facilitator.402.bot/verify',
+}));
+
+// Option B: manual (just check the payment header)
+app.use('/api', (req, res, next) => {
+  const payment = req.headers['x-payment'];
+  if (!payment) {
+    // Return 402 with payment requirements
+    res.status(402).json({
+      accepts: [{ network: 'eip155:8453', asset: 'USDC', address: process.env.X402_WALLET_ADDRESS }],
+      price: '0.01',
+    });
+    return;
+  }
+  // Verify payment with facilitator
+  // See: https://api.402.bot/mcp/setup
+  next();
+});