x402 is a new payment protocol developed by Coinbase that activates the long-dormant HTTP 402 code, turning it into a tool for instant stablecoin payments over the internet. This protocol eliminates the need for accounts or intermediaries, allowing websites, APIs, and AI agents to send and receive payments quickly and efficiently. Key features include instant settlement with no protocol fees and a simple setup process requiring just a single line of code. It supports multiple blockchain networks, making it versatile for various digital environments. The operation of x402 hinges on standard HTTP requests. When a user or AI agent seeks a paid resource, the server responds with an HTTP 402 code containing payment details in JSON format. Payment is made using USDC through a facilitator like Coinbase, and once verified, access is granted almost immediately. This system addresses a long-standing gap in online payments, where developers often relied on slower, costlier methods like credit cards or subscriptions. With x402, real micropayments become feasible, allowing users to pay per API call rather than on a subscription basis. Adoption statistics show that in the past month alone, x402 has facilitated over 43,000 transactions, generating more than $50,000 in volume with contributions from 300 buyers and 190 sellers. AI agents are particularly poised to benefit from this system, as they can handle real-time transactions for computing resources and engage in marketplaces for services. This enhances the potential for automated commerce, where agents manage assets and perform transactions independently. The ecosystem surrounding x402 includes various client-side integrations and infrastructure tools, enabling seamless interactions across platforms. As the technology matures, it could reshape how payments are processed online, bridging traditional web functions with decentralized finance. This shift may simplify and accelerate transactions across industries, reflecting the growing importance of real-time payment solutions.