Palindrome Pay

Palindrome Fox is a Chrome extension that enables you to shop on Amazon using cryptocurrency. It seamlessly integrates with Amazon.com (US) and Amazon.co.uk (UK), adding a custom "Add to My Cart" button directly on product pages.

How it works: As you browse Amazon, simply click the Palindrome Fox button to add items to your crypto cart. When you're ready to checkout, click the extension icon to review your cart, connect your crypto wallet, and pay with USDC through Palindrome Pay.

Built-in Escrow Protection: Your payment is securely held in escrow until you confirm that your order has been delivered. This protects both buyers and sellers, ensuring a trustworthy transaction experience.

Key Features: • Browse and shop Amazon as usual with an overlay button on product pages • Build a separate crypto cart without affecting your regular Amazon cart • Pay with USDC stablecoin for price stability • Escrow-based payments for buyer protection • Supports both US and UK Amazon marketplaces

Perfect for crypto holders who want to use their digital assets for everyday Amazon purchases without the hassle of converting to fiat currency first.

Palindrome Fox is a Chrome Extension built with Manifest V3 and pure vanilla JavaScript for fast performance and minimal footprint.

Chrome Extension APIs for storage, messaging, and tab management Content Scripts that inject a custom "Add to Cart" button on Amazon gift card pages MutationObserver to handle Amazon's dynamic page loading and SPA navigation Frankfurter.dev API for real-time GBP to USD currency conversion Palindrome Pay Integration: The extension leverages Palindrome Pay's software infrastructure to make crypto payments possible and manageable. Palindrome Pay handles wallet connections, USDC transactions on Base blockchain, and provides built-in escrow protection. This allows us to focus on the shopping experience while Palindrome Pay manages the entire payment flow, from checkout to funds release upon delivery confirmation.

How It Works: The content script detects Amazon eGift card pages, hides Amazon's native buttons, and injects our crypto-enabled cart button. A background service worker manages cart state. At checkout, cart data is passed to Palindrome Pay's hosted checkout page where the crypto payment and escrow are processed.

Bypasses React's input handling to autofill Amazon's gift card email fields Detects eGift vs physical gift cards by parsing URLs and page content Tracks product image changes when users select different gift card designs