Optimism
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Optimism is an Optimistic Rollup, a layer 2 scaling solution built on top of Ethereum. It launched as alpha mainnet in January of 2021 and was fully EVM-compatible in October 2021. As of now, it counts more than 30 DeFi protocols[1]
Main Protocols
Optimism features the main kinds of DeFi protocols, like Aave as money market and Uniswap and Curve as AMMs. It also counts a variety of on-chain options protocols, which allow users to trade and earn yield on derivatives through different mechanisms.