Optimism is the organization behind OP Mainnet, one of the most widely used layer-2 scaling solutions for Ethereum. The project traces its roots to 2019 when the Optimism team (originally called Plasma Group) began developing optimistic rollup technology as a way to reduce Ethereum’s transaction costs while preserving its security model.
Optimistic rollups work differently from zero-knowledge rollups. Instead of proving every transaction is valid upfront, they assume transactions are correct and only verify them if someone submits a fraud proof within a challenge window. This approach is simpler to implement and more EVM-compatible, which helped Optimism attract early adopters.
The project’s biggest strategic move was launching the OP Stack in 2023 — an open-source modular framework that lets anyone deploy their own layer-2 chain. Coinbase used the OP Stack to build Base, which became one of the fastest-growing L2s in the ecosystem. Worldcoin, BNB Chain, Sony, and Zora have all launched or announced OP Stack chains. This “Superchain” vision positions Optimism as the foundation layer for a network of interoperable L2 chains.
Optimism operates through the Optimism Foundation and the Optimism Collective, a governance experiment that includes both a Token House (OP token holders) and a Citizens’ House (focused on retroactive public goods funding). The project has distributed hundreds of millions of dollars in OP tokens to fund public goods — an approach inspired by Vitalik Buterin’s writing on retroactive funding. The OP token has maintained a multi-billion dollar market cap since its 2022 launch.
