Dusa is an AMM fully on-chain based on Massa Blockchain. We use two new technologies in DeFi: 1) The use of autonomous smart-contracts to optimize the main DeFi mechanisms By using autonomous smart contracts, Dusa optimises the main mechanisms of decentralized finance and increases the security of our decentralized application by not using localized off-chain initiators (oracles, bots). Thus, we were able to theorize the concept of autonomous liquidity. This allows liquidity providers (LPs) to have an automatic management of their liquidity positions. The advantages of this new system are: ● Better user experience: users only need to make one deposit, this makes our application easier to access and use. ● No centralization: liquidity management is done without the use of bots or liquidity managers. ● Increases P&L: liquidity is managed dynamically and brings more profit to users. In addition to autonomous liquidity, Dusa is able to offer complex trading orders and this entirely on the blockchain using autonomous smart-contracts. For example, we are developing Dollar Cost Average (DCA) and One Cancels the Other (OCO) features to provide a fully blockchain-based experience without the use of bots. 2) A decentralised application resistant to censorship thanks to a front-end hosted directly on-chain In response to the challenges of decentralization and security in decentralized finance (DeFi), the Dusa decentralized application is hosted directly on the blockchain (not IPFS) so that the web application is not censorable.