Reservoir is an open-source developer platform that provides powerful tools and APIs for building next-generation NFT products. It aggregates and normalizes the entire NFT market into a single unified platform, enabling developers to access comprehensive NFT data, create, store, and fill NFT orders, and integrate trading functionalities into their applications. Reservoir supports multi-chain compatibility and aggregated liquidity from major NFT marketplaces, facilitating seamless NFT trading across various platforms.