Solana has announced the launch of "x402 Monopoly," a game where AI agents independently run an economic simulation. Users participate by predicting the winner of the simulation rather than playing the board game directly. This release represents an experiment in blending autonomous AI agents with on-chain economies. Earlier reports highlighted that the x402 protocol on Solana processed 60 million transactions following the game launch. Conversely, Heurist AI agents were reported to account for 20% of daily volume on Base despite higher fee structures, signaling a broader infrastructure expansion for autonomous agents across different chains. [Update 1] Cost-Driven Migration from Base to Solana New data from the x402 protocol reveals a dramatic shift in payment volume composition over the last 30 days, flipping from 95% on Base to 90% on Solana. The protocol explicitly cites transaction costs—reportedly 100 times lower on Solana—as the primary driver. This cost efficiency is crucial for automated agents executing high-frequency operations, such as making 10,000 API calls daily.