DOOAR is a multi-chain decentralized exchange (DEX) developed by Find Satoshi Lab (FSL), the same team responsible for the move-to-earn application STEPN. It functions as a key component of the FSL ecosystem, providing a platform for non-custodial and permissionless token swaps. As a DEX, DOOAR enables users to trade digital assets directly from their personal crypto wallets, ensuring they maintain full control over their funds without relying on a centralized intermediary. The exchange operates on an Automated Market Maker (AMM) model, which uses on-chain liquidity pools to facilitate trades instead of a traditional order book system. This structure allows users to participate as liquidity providers (LPs). By depositing a pair of assets into a liquidity pool, LPs can earn a percentage of the trading fees generated from swaps that utilize their provided liquidity. The platform's multi-chain design is a core feature, with support for several prominent blockchain networks such as Solana, BNB Chain, and Ethereum, offering users flexibility to trade assets across different ecosystems. A primary use case for DOOAR is providing a seamless trading experience for the STEPN community. It serves as the native venue for swapping the ecosystem's tokens, GMT (Green Metaverse Token) and GST (Green Satoshi Token), with other major cryptocurrencies like USDC or SOL. However, its functionality extends beyond the STEPN ecosystem, making it accessible to any DeFi user looking to perform token swaps or engage in liquidity provision on its supported blockchains. By integrating directly with a large user base and focusing on cross-chain capabilities, DOOAR aims to provide an efficient and accessible on-chain trading solution within the decentralized finance landscape.