Polymarket is planning to switch chains, and currently, the most likely option is: building a dedicated L2 chain (called POLY) within the Ethereum ecosystem. This seems to be the best choice for now. Right now, Polymarket is still running on Polygon: main trading, order book, USDC.e/pUSD are all on Polygon. However, after going viral, Polygon's block space has become highly competitive, leading to delays, unstable gas fees, and other issues that can't meet Polymarket's needs for 'near-instant settlement + high-frequency trading.' Why build its own L2? 1. Full control over block space, block speed, and gas fees, optimized specifically for prediction markets + the upcoming Perps (low latency, cheap, high throughput). 2. Avoid competing for resources with other dApps, while enabling better compliance (related to CFTC). 3. There are examples like lighter's 'application chain' to follow. As for other options, the chances of choosing Solana or Base/Arbitrum are low. Solana's advantage is speed + low cost, but Polymarket is Ethereum-based (contracts, ecosystem, USDC), so switching costs are high. Currently, it mainly supports SOL deposit bridging, but there are no signs of chain migration yet. Base/Arbitrum and other L2s might be used for multi-chain expansion, but they won’t be the main hub.