SUN.io has successfully upgraded its smart routing system by introducing the Universal Router and Permit2 protocol. According to NS3.AI, this enhancement allows users to perform efficient multi-pool swaps in a single transaction across various liquidity pools, including SunSwap V1/V2/V3 and Curve. The Permit2 protocol further optimizes the process by minimizing repeated authorization costs and enhancing security through advanced signature management and quota controls.