The x402 protocol is revitalizing the HTTP 402 "Payment Required" status code to integrate payments directly into the web, enabling seamless internet-native transactions, particularly for micropayments and AI-driven commerce. Developed with input from major tech and finance players, x402 is designed to fit into existing web infrastructures, facilitating lightweight, stateless transactions through blockchain settlements, often using stablecoins like USDC. This advancement supports a shift from subscription models to pay-per-use scenarios and empowers AI agents to autonomously handle transactions, fostering a machine-to-machine economy. Despite its potential, x402 necessitates strong authorization measures to ensure security and control over access to paid resources, with solutions like Permit.io offering policy-based controls. The growing ecosystem around x402, supported by infrastructure providers and tech firms, is driving its adoption, although challenges such as regulatory landscapes and wallet experiences remain. As x402 evolves, its integration with advanced authorization systems is crucial for maintaining security and scalability in digital transactions.