Merlin tackles a crucial problem in portfolio monitoring by going beyond the basic task of tracking DeFi positions and presenting them in a user-friendly interface. It offers comprehensive analysis of performance metrics such as yield, P&L in USD, and impermanent loss, along with historical transactional information and market data for in-depth pool and protocol-level analysis. The interface is free for all users and includes open APIs. For users with more specific data needs, a paid API version is also available.