Nostra is the most versatile liquidity protocol for lending and borrowing. It is a permissionless non-custodial lending and borrowing protocol built on StarkNet, one of the most-promising L2 networks on Ethereum, where everyday users can lend and borrow crypto assets without the need for a trusted third party to act as an intermediary. Nostra builds upon the foundations of well-established money markets (Compound, Aave, Euler Finance) while introducing new features that improve both capital efficiency and composability and takes into account the low gas fee environment of StarkNet. We have chosen to build Nostra on StarkNet because its underlying ZK-proof technology is ideal for building scalable and accessible DeFi products in a decentralized environment with fast finality times and cheap gas fees without compromising Ethereum's security.