For the past decade, if you mentioned "cryptocurrency" to an average person, the words that most likely came to mind were: get rich quick, being exploited, hacking, or some incomprehensible geek toy. From the sudden emergence of Bitcoin (BTC) to the smart contract revolution of Ethereum (ETH), and the clamor of various public chains and stablecoins, the world has been noisy for over a decade. Countless brilliant minds and massive amounts of capital have poured into it, attempting to build a decentralized utopia. But we are still confused in real life: besides being a highly volatile speculative asset, besides buying low and selling high on exchanges, what is the actual use of cryptocurrency? When we go downstairs to buy a cup of coffee, we still use WeChat Pay and Alipay; for cross-border transfers, we still have to go through cumbersome bank wire transfers. It claims to be disrupting finance, yet it seems to be unable to even do the most basic "payment" well. Until today, with the arrival of the A2A (Agent to Agent) smart economy, this confusion has finally been answered: cryptocurrency has not failed; it has simply been targeting the wrong users over the past decade. When Satoshi Nakamoto released the Bitcoin white paper in 2008, the title was prominently displayed: "A Peer-to-Peer Electronic Cash System." His initial intention was to create an everyday payment tool. In 2010, a programmer named Laszlo used 10,000 Bitcoins to buy two pizzas. This was considered a great beginning for cryptocurrency payments. However, the subsequent story went to the other extreme. There are three insurmountable real-world obstacles preventing cryptocurrencies from becoming everyday currencies: First, volatility. When something is worth $1 today but might drop to $0.50 or rise to $2 tomorrow, no one dares to use it to price their money. There's a common-sense principle in economics called "good money is hoarded," and when you expect Bitcoin to rise, you're definitely not going to use it to buy pizza. Second, the counterintuitive experience. Humans are extremely averse to trouble. Crypto payments require you to carefully safeguard a long string of seemingly random private keys; once lost, your assets are instantly wiped out, and there's no customer service to help you recover them. You also need to understand what gas fees are and endure long waits during network congestion. Finally, there's regulation and taxation. In many countries, buying a cup of coffee with cryptocurrency is considered an "asset sale" by the tax authorities, requiring you to calculate and declare capital gains tax. What humanity needs are stable, simple financial services with customer support and legal protection. While there are frictions between traditional banking and the fiat currency system, they perfectly meet humanity's need for security.Cryptocurrencies attempt to pull humanity into a cold, absolutely rational world of code where risk is borne by the user, but this has naturally been rejected by humanity, ultimately degenerating into a kind of "digital gold" and speculative bargaining chip. But what if we shift our perspective from "human" to "machine"? In an A2A intelligent economy, hundreds of millions of AI agents will be calling each other's APIs, purchasing computing power, acquiring data, and even negotiating rental agreements for you every day. Coinbase's CEO once astutely pointed out: "AI can't open a bank account with an ID card, but they can control a crypto wallet without any obstacles." For AI agents, the advantages of the traditional financial system are all disadvantages, while the disadvantages of cryptocurrency are all advantages. Machines don't need customer service; they only trust code. Traditional contracts require lawyers to draft, courts to enforce, and banks to settle, taking days or even months. In the world of agents, they use "smart contracts"—essentially a program stored on the blockchain. When conditions are met, funds are automatically transferred instantly, and no one can default. This is the true "machine-native contract." Machines require millisecond-level micropayments. Imagine an AI agent generating a report for you. It needs to purchase a piece of real-time data from another agent for $0.001. Traditional credit card networks charge a $0.30 fee per transaction, making such a microtransaction impossible. However, through an encrypted network, the agent can complete the settlement at extremely low cost within milliseconds. Machines have no borders and no identities. They don't require complex KYC (Know Your Customer) verification. With just a private key, an agent running on a Singapore server can instantly pay an agent running in Tokyo. In the original design of the HTTP protocol, there was actually a status code called 402 Payment Required. Internet pioneers foresaw that the future network would not only transmit information but also value. However, due to the lack of a native internet payment layer at the time, this 402 status code was shelved for 30 years, almost never actually used. Until 2025, a payment protocol specifically designed for AI agents was born, and it was called x402. Using the x402 protocol, when an agent requests data from another server, if payment is required, the server no longer displays a credit card form that requires human input. Instead, it directly returns a machine-readable "402 Payment Required" instruction. Upon receiving the instruction, the agent instantly uses USDC from its encrypted wallet to complete the payment. The entire process is completed within a few hundred milliseconds, and the data channel is then opened.No registration, no QR code scanning, no password verification. Value flows seamlessly through the foundation of the internet, like data. According to data from blockchain analytics firms, in just a few months from 2025 to early 2026, AI Agents completed hundreds of millions of payments via stablecoins. Cryptocurrencies no longer need to prove themselves superior to Alipay; they have sunk into the depths of the internet, becoming the silent lifeblood of countless machines. But the story doesn't end there. When machines begin to have wallets, to earn and spend money autonomously, how should we, as humans deeply entrenched in the concepts of "cash" and "bank accounts," understand this new form of wealth? What is the relationship between our money and the money of machines? In the past, wealth was explicit and physical. You pulled out a banknote or opened a bank app to watch your balance change; you had a visceral understanding of "spending money." But in the future, wealth will be folded. Imagine hiring an AI Agent to help you manage a social media account. You don't need to pay it a salary; you only need to deposit 100 USDC (equivalent to $100) into its "Agentic Wallet" in the initial stage. Next, this agent begins its autonomous rampage: it pays another data agent 0.05 USDC to obtain trending topics; it pays a graphics agent 0.1 USDC to generate accompanying images; after an article is published, it automatically deposits its advertising revenue share (possibly 0.5 USDC) into its own wallet. In this process, the machine's money flows, earns interest, and is consumed at millisecond speeds within the underlying network. As its human owner, you see none of these densely packed micro-payment transactions. You don't need to understand what x402 is, nor do you need to know what smart contracts are. The only thing you see is a minimalist weekly report from the agent: "This week, you invested $10 and earned a net profit of $50, which has been withdrawn to your fiat bank account." This is the ultimate division of labor between humans and machines in wealth management: machines handle the friction, and humans enjoy the results. Machine money (cryptocurrency) is for circulation; it's a high-frequency, ruthless, and efficiency-driven means of production. Human money (fiat currency), on the other hand, is for experience; it's the ultimate destination for buying coffee, paying rent, and providing a sense of security. Cryptocurrency hasn't eliminated bank accounts; it has merely pushed complex financial transactions a layer deeper. While humans enjoy the ultimate convenience brought by AI at the forefront, in those unseen layers, a financial system specifically for machines is silently reshaping the world's business rules.