Yesterday, Coinbase released the Ethereum L2 network "Base" and announced a partnership with Optimism to develop Base based on the OP Stack. As soon as the news came out, the entire OP ecosystem was boiling again. At the moment when everyone's eyes are turned back to Optimism, we have summarized 9 popular and potential projects in the OP ecosystem that are worth paying attention to. VelodromeVelodrome is an AMM DEX on Optimism, designed to provide deep liquidity, low transaction fees and low slippage. Velodrome is built on the basis of AC's previous project Solidly, and has made many improvements to it to make the mechanism more perfect. It was built by the veDAO team. Velodrome is currently the number one protocol in the Optimism network TVL, with a total locked position of US$287 million. Perpetual ProtocolPerpetual Protocol is a decentralized perpetual contract trading protocol that uses virtual AMM (vAMM) to provide sufficient liquidity, and can provide trading and liquidity for various large and long-tail crypto assets with up to 10 times leverage. Currently, Perpetual Protocol has a TVL of $17 million on Optimism. SynthetixSynthetix is ​​a decentralized liquidity supply protocol based on Ethereum mainnet and Optimistic. Its collateral model combined with synthetic assets allows users to directly use smart contracts to convert between synthetic assets without counterparties, thereby solving the liquidity and slippage problems encountered by DEX. Currently, Synthetix has a TVL of $302 million on Ethereum mainnet and a TVL of $132 million on Optimism. OPXOPX is a decentralized spot and perpetual exchange on Optimism, built on GMX, providing low swap fees and zero price impact transactions. OPX plans to launch its token in the first quarter of 2023. Currently, OPX has a TVL of $628,410 on Optimism. Sonne FinanceSonne Finance is the first Optimism native lending protocol based on Compound, providing services for individuals, institutions and protocols at the same time. Sonne Finance aims to bring TVL into the Optimism network through high returns with low impermanent loss, and leverage its Optimism native advantages to provide more competitive incentives than other protocols. Sonne Finance currently has a TVL of $28 million. Beethoven XBeethoven X is a decentralized investment and trading platform based on Fantom and Optimism, built around the core concept of programmable liquidity.Beethoven X provides traders with smart pricing, low gas fees, and low slippage, and provides investors with cutting-edge liquidity pools, personalized finance, and high capital efficiency. It provides protocols with customizable AMM design, interconnected liquidity, and proven smart contracts. Currently, Beethoven X has a TVL of $34 million on Optimism and a TVL of $49 million on Fantom. Pika Protocol Pika Protocol is a decentralized perpetual contract trading platform on Optimism, which provides 100x leverage, low slippage, multi-asset trading, low transaction fees, and simple interaction. Currently, Pika Protocol has a TVL of $12 million on Optimism. Lyra Lyra is a decentralized options trading platform on Ethereum mainnet, Arbitrum, and Optimism, and is also the first complete decentralized options protocol on Ethereum. Lyra enables traders to participate in the entire crypto market with low fees and sub-second transaction speeds. Through its Market Maker Vault (MMV) mechanism, Lyra's LPs can automatically make markets for options trades and earn transaction fees. Lyra currently has a TVL of $13 million on Optimism, $17 million on Arbitrum, and $143,500 on the Ethereum mainnet. Arrakis Finance Arrakis is a trustless market-making infrastructure protocol built on Uniswap V3 that can run complex strategies. LPs can use Arrakis Vaults to manage their liquidity in an automated, capital-efficient, non-custodial, and transparent manner. Arrakis Finance has a TVL of $5.08 million on Optimism, $439 million on the Ethereum mainnet, and $5.43 million on Polygon.