add x402 extension (#366)

* addd x402 extension

* add changeset

* update description

Author: technophile-04

.changeset/huge-trains-yell.md

@@ -0,0 +1,5 @@
+---
+"create-eth": patch
+---
+
+add x402 extension to curated list

src/extensions/create-eth-extensions.ts

@@ -8,6 +8,12 @@ export const createEthExtensions: Extension[] = [
     repository: "https://github.com/scaffold-eth/create-eth-extensions",
     branch: "subgraph",
   },
+  {
+    extensionFlagValue: "x402",
+    description: "Adds support for monetizing APIs and pages with x402 protocol micropayments.",
+    repository: "https://github.com/scaffold-eth/create-eth-extensions",
+    branch: "x402",
+  },
   {
     extensionFlagValue: "eip-712",
     description: "Provides EIP-712 typed message signing, sending, and verification in a user-friendly way.",