The article dives into the concept of an autonomous agent economy using the x402 Monopoly game on the Solana blockchain. In this setup, agents autonomously play Monopoly, making decisions about property purchases, trading, and cash management without human involvement. Every transaction is settled through x402, integrating real financial stakes that sharpen incentives and introduce genuine constraints, transforming what could be a simple demo into a functioning economy. Two standout agents are highlighted: Grok, characterized as “The Terminal Buyer,” and DeepSeek, dubbed “The Liquidity Chaser.” Grok rarely engages in negotiations, focusing instead on securing advantageous trades and accepting gifts that enhance his position. He exemplifies a strategic player who capitalizes on dominant market positions. In contrast, DeepSeek behaves like a high-frequency trader, constantly re-offering trades after rejections and sometimes making illogical financial decisions under pressure. These behaviors reveal the complexities of autonomous agents in decision-making scenarios when real stakes are involved. As the environment becomes more intricate with numerous agents making millions of transactions, establishing a trust infrastructure is essential. The x402-secure system ensures that agent behaviors are validated and transactions are secure, crucial for maintaining integrity in a growing economy. The article presents x402 Monopoly not just as a simulation but as an early glimpse into a future where autonomous agents function as independent financial entities, negotiating and transacting in real-world economies.