Coinbase has introduced the x402 protocol, transforming the long-unused HTTP 402 status code into a payment layer that enables AI agents to autonomously process payments without human intervention. This innovation facilitates a more efficient system for digital transactions, allowing servers to request payments and clients, including AI agents, to respond using stablecoins like USDC. Other major companies like Visa and PayPal are also exploring similar autonomous payment solutions for AI-driven commerce.