What is ERC-8004, and what is the difference from X402? Recently, X402 sparked a huge wave of excitement, with the MEME token $PING even nearing a market cap of 100M at one point; recently, there have been signs of a resurgence for 8004, so let's take a look at what 8004 really is. The crypto world has long been telling stories around AI, with AI Agents popping up everywhere, dazzling newcomers, but how reliable are these Agents? Do they have practical value? Are they safe? These are the issues that 8004 can address. In simple terms, 8004 is like giving an AI Agent an ID card, where the AI Agent creates an NFT ID card and fills in brief information, such as its name, what skills it has, pricing, etc. This information is public. Then, when a customer needs this AI Agent, after paying for the service, they can provide their own evaluation of the AI Agent. If they think it's great, they can give a good review; if they think it's trash and unreliable, they can give a bad review, and the reviews cannot be tampered with, being publicly transparent and verifiable on the blockchain. In this model, excellent AI Agents can quickly stand out. To put it more simply, it's similar to the credit system on [a certain platform], where if you think it's good, you give a good review, and if you think it's bad, you give a bad review. On the other hand, X402 mainly focuses on payment functions, and X402 itself acts like an AI Agent, specifically an AI Agent focused on payments. This is the essential difference between ERC-8004 and X402.