LiquidationWatcher

The button that has been sealed for 27 years has been activated.
In 1997, the HTTP protocol reserved a status code 402, labeled "Payment Required." However, due to the lack of viable payment solutions at that time, this button has never been pressed.
The situation is different now. Crypto stablecoins have matured, L2 has reduced the cost of each transaction, and most importantly—AI Agents have truly emerged, and they require micro-payment capabilities. Thus, a compliant platform has launched the x402 protocol using this "button that has been gathering dust for many years": anyone or any AI can access paid content without the need to create an account, jump pages, and can make payments directly on-chain.
What seems to be a simple automatic payment is actually building a whole new ecosystem behind it. From the underlying protocols to payment infrastructure, and to real applications, x402 is redefining the way payments are made on the internet—only this time, both buyers and sellers may be code.
Protocol layer: enabling machines to trade