Optimism is one of Ethereum's oldest and most consequential layer-2 scaling networks, an optimistic rollup that batches transactions off-chain and posts compressed data back to Ethereum for settlement. Its native token, OP, doubles as a governance instrument and the fuel behind a growing family of chains built on its open-source OP Stack.
What Optimism does
Optimism assumes transactions are valid by default and only runs fraud proofs if someone challenges a batch during a seven-day window, which is what lets it settle far cheaper and faster than Ethereum mainnet while still inheriting its security. The bigger story now is the Superchain: a family of OP Stack chains, including Base, Zora, Worldchain and Mode, that share a communication layer, a token, and, eventually, a single decentralised sequencer set. OP holders, through the Optimism Collective's bicameral governance of a Token House and a Citizens' House, vote on protocol upgrades and steer RetroPGF, a mechanism that retroactively funds public goods builders rather than grant applications written in advance.
Revenue sharing is the underlying economic bet: chains that adopt the OP Stack contribute a slice of sequencer profits back to the Optimism Collective, meant to fund the Superchain's public goods flywheel long after venture subsidies dry up.
Risks
The sequencer on Optimism, like on most rollups, is still run by a single centralised operator, meaning it can theoretically reorder or delay transactions, and the fault-proof system meant to fully decentralise this is still being rolled out in stages. OP's token unlocks are large and ongoing, with a substantial share still held by the core team and investors, which puts persistent sell pressure on the market regardless of usage growth. It also faces intensifying competition from Arbitrum, zk-rollups such as zkSync and Starknet, and even from chains built on its own stack like Base, which could out-compete the mainline Optimism chain for activity and fees.
None of that erases the network effects Optimism has built: it remains the most widely adopted rollup framework by chain count, and its governance experiment is the most closely watched in the rollup world.