The most important thing about x402 is to promote the development of the AI agent economy. This time x402 v2 has arrived, which is a step forward. Before x402, AI agents could spend $0.001 or even less for every question asked, image calculated, or webpage crawled. At this point, if paying with a traditional credit card or Stripe, the transaction fee starts at $0.3. In other words, although the traditional Internet payment is developed, it is not suitable for AI agent's micro payment scenario. Each API call of $0.001 is not suitable for payment with credit card or stripe. Because the handling fee (approximately 2-3%+$0.30) is much higher than the payment amount. Moreover, AI agents are not human and are unable to open bank accounts, add gas, enter passwords, or confirm points, which are all major challenges for AI agents. And at this point, x402 came in handy. It changed the "HTTP 402 payment request", a web page error code that was not used originally, into an "AI proxy Alipay". The process is also simple: AI knocks on the door and says, "Boss, give me some data!" → The server says, "Okay, scan the code and pay 0.001 dollars." (Directly returns a 402 code, which clearly states how much to pay, who to pay, and which chain to use) → The AI agent transfers USDC (completed in less than 1 second, with a handling fee of less than 0.0001 dollars) → The server sees the money in the account and immediately sends it the item. During this process, no one is responsible for the wallet, no gas needs to be charged, no account needs to be registered, and no API key is required. The AI agent completes the transaction on its own. This is supported by x402 V1. However, V1 still has some minor obstacles: By default, playing on the Base chain requires manual configuration of the application to support multi chain facilitators; There is a 'relay' in the middle to help you pay for gas, and the relay will pay for it themselves. If you work for a long time, you will definitely not work; Each transaction requires cash confirmation, and if there are too many times, it will be stuck; Although wallets and gas have been simplified, it is still a bit troublesome to use them frequently. V2 mainly solves the above-mentioned problems: Choose whichever chain you want to use, Base, Solana, Polygon... whatever you want (default for multiple chains); You can 'use first, settle later', for example, saving 100 small calls together and paying again (delayed/batch); Even traditional payments such as bank cards and ACH can be connected, and fiat currency can be used if desired (supported by existing channels); In addition, various methods such as automatic price discovery, automatic selection of the cheapest, subscription system, and pre recharge have been added (workflow optimization). In summary, X402 v1 enables AI agents to achieve the ability to "pay for themselves" (they can pay for it themselves, but have to pay one by one) X402 v2 directly sent AI a "black card+no password payment", making it much more convenient to buy. So, everyone says that x402 v2 will contribute to the increasingly prosperous AI economy. Thousands of AI agents are taking orders, buying computing power, data, and paying salaries on their own... all working together.