Double Protocol is an open-source NFT rental protocol and marketplace for Metaverse and GameFi assets. It allows users to rent, lend, earn, and partner with NFTs. The protocol supports various chains including Ethereum, BNB Chain, Polygon, Avalanche, Fantom, Arbitrum, PlatON, OKXChain, Moonbeam, ThunderCore, Cronos, Liberty 2.X, and Redlight. The platform offers features such as asset security, complete control, batch listing, simplicity, and instant yield. Additionally, it provides tools for auto-deployment and a powerful dashboard for analytics and governance. Double Protocol aims to connect NFT owners with users in an on-chain marketplace.