Merlin solves a key portfolio monitoring issue by extending further than simply keeping track of all DeFi positions and reporting on them in a simple interface. Merlin provides detailed analysis on performance metrics (yield, P&L in USD, impermanent loss etc.) and historical transactional information, market data (pool and protocol-level analysis) and more. The free to use interface is available for all users, including open APIs. If the user has more granular and specific data requirements, there's a paid API version available too.