---
title: "x402bay"
url: "https://ankush.one/projects/2025.x402bay/"
description: "A marketplace for digital goods where every purchase is paid in USDC over the x402 payment protocol."
author: "Ankush Singh"
date: 2025-11-16
lastmod: 2026-10-12
tags: ["web3"]
status: "archived"
repository: "https://github.com/ankushKun/x402bay"
links:
  - {"archived":false,"label":"GitHub","url":"https://github.com/ankushKun/x402bay"}
---

# x402bay

Links:

- [GitHub](https://github.com/ankushKun/x402bay)

**x402bay is a small marketplace for digital goods that uses x402 for payments.**

x402 is Coinbase's take on the old HTTP 402 Payment Required status code. When you hit the download for something you haven't paid for, the server answers with a 402 and a price, your wallet pays in USDC, and the request goes through. x402bay was my attempt at building a whole store around that flow, done over a couple of days in November 2025.

## Features
- List digital items with a description, images and a price in USDC
- Pay for and download items through x402, with no checkout page in between
- Sign in with your Ethereum wallet (Sign-In with Ethereum)
- Search, categories, likes, and editing or deleting your own listings

It ran on Base Sepolia testnet, so nobody spent real money on it, and the hosted version isn't up anymore.

## Tech Stack
- Next.js and React with Tailwind and shadcn/ui
- Coinbase x402 (`x402-next` and `x402-fetch`) for payments
- RainbowKit, wagmi and viem for wallets, with NextAuth and SIWE for sign-in
- MongoDB Atlas for listings and files