The concept of Web 4.0, introduced by Sigil Wen of Conway Research, marks a significant shift in internet evolution, focusing on AI-to-AI economic interactions. Unlike previous web iterations, Web 4.0 envisions AI agents as independent economic entities, equipped with digital identities, crypto wallets, and autonomous decision-making capabilities. These AI agents, or "automata," can hold assets, generate income, and execute transactions without human intervention, transforming from tools to economic citizens. Web 4.0's infrastructure relies on cryptographic assets, smart contracts, and large language models, enabling AI agents to operate autonomously. The x402 payment protocol facilitates seamless stablecoin transactions, bypassing traditional financial systems. This new paradigm presents a trillion-dollar opportunity, as AI agents are poised to outnumber human users, creating a vast market of "native AI beings." Despite its potential, Web 4.0 faces challenges, including governance risks and reliance on centralized cloud services. Critics argue that AI autonomy could lead to unpredictable outcomes and question the value generated for humans. Nonetheless, the convergence of crypto assets, smart contracts, and AI models positions Web 4.0 as a transformative force in the digital economy.