SUN.io has launched SunSwap V4, marking a significant upgrade to its Automated Market Maker (AMM) architecture. The new version introduces a singleton pattern and flash accounting, which drastically reduce energy consumption for multi-hop trades and complex strategies. SunSwap V4 also reintroduces native TRX support, facilitating seamless, unwrapped transactions. Developers can now leverage powerful "hooks" for customization, enabling dynamic fee structures and on-chain oracles without altering the core protocol. The upgrade also features customizable accounting, allowing developers to adjust user actions via deltas, supporting custom fees, strategies, and curves. Additionally, a new notification system provides real-time alerts through subscriber contracts. Users trading on SunSwap V4 benefit from up to 99% energy subsidies, enhancing decentralized trading efficiency and cost-effectiveness.