Pineopple Ventures

29 September 2025 • x402 is a new payment for request from coinbase continued

Refer to the prior article on 28 Sept for initial brief.

I've now had some time to reflect and believe that this opportunity could be bigger then I initially thought. The key to all this is payment details being embedded in the initial response; this could be used to build a proper p2p billing engine and bypass the traditional POS infrastructure.

The POS can generate a QR code (this is big in china for some reason), user can scan on mobile and then once the transaction is completed there can be a listening polling until the transaction settles.

Customer opens their x402-enabled wallet app (e.g., Coinbase Wallet on iOS/Android). Scan the QR code—your phone's camera decodes it as an HTTP request to the shop's endpoint. The app sends a GET/POST request to /order/latte. Server responds: HTTP/1.1 402 Payment Required with headers like:

textPayment-Address: 0xShopWalletAddress
Payment-Amount: 5 USD
Payment-Currency: USDC
Payment-Scheme: exact

Confirmation & Fulfillment:

Server detects payment (via event listener or callback), responds: HTTP/1.1 200 OK with a digital receipt or fulfillment token (e.g., "Order ready at counter"). Barista gets a notification (e.g., via integrated KDS—kitchen display system). Hand over the coffee. Bonus: App shows receipt in-wallet; shop gets funds in their wallet instantly.

[Quick note] nil