An Ethereum optimistic rollup with deep DeFi liquidity, governed by ARB holders.
Arbitrum is an optimistic rollup: it executes transactions off Ethereum's base layer and posts the results back, inheriting Ethereum's security while charging a fraction of the fees. It holds some of the deepest DeFi liquidity outside Ethereum itself. ARB is a governance token for the Arbitrum DAO, not the gas token, which is a distinction many newcomers get wrong.
ARB is a claim on governance, not on sequencer revenue; price them differently.
Rollup competition is fought on liquidity and applications, not on raw technology.
Watch how much control actually sits with the DAO versus the core company.
Transactions are executed by a sequencer off-chain and their results are posted to Ethereum, which stores the data. Results are assumed valid unless someone submits a fraud proof during a challenge window, which is why the model is called optimistic. That window is the reason withdrawals back to Ethereum take days by default, unless a third-party bridge fronts the liquidity for a fee.
Voting in the Arbitrum DAO on upgrades and treasury spending
Delegation of governance power to active delegates
Access to ecosystem programs decided by governance
ARB does not pay gas: fees on Arbitrum are paid in ETH. Sequencer revenue accrues to the entities operating the chain and, through governance decisions, to the DAO treasury. So ARB's value rests on governance rights over a large treasury and over how the chain is run, not on a fee stream automatically flowing to holders. Chain activity growing does not mechanically benefit ARB.
The Arbitrum DAO votes on treasury allocation, protocol upgrades and ecosystem programs, with the Arbitrum Foundation executing decisions. Voting power is delegated, so influence concentrates among active delegates. A recurring governance theme has been how much control the DAO genuinely holds over the sequencer and upgrade keys versus the core development company.
Centralized sequencer: a single operator orders transactions and can censor or halt in practice.
Upgrade keys: contracts remain upgradeable by a limited set of parties, a common rollup caveat.
Token unlocks: scheduled releases to investors and contributors add persistent supply pressure.
Weak value capture: gas is paid in ETH, so usage does not directly reward ARB holders.
Intense L2 competition, where liquidity can migrate quickly to whichever chain subsidises it.
No. Gas on Arbitrum is paid in ETH. ARB is only needed if you want to participate in governance. Buying ARB to transact is a common and avoidable mistake.
Because of the fraud-proof challenge window. Optimistic rollups assume posted results are correct and allow time for anyone to prove otherwise. Fast bridges shorten this by advancing you the funds and taking the wait themselves, for a fee and with their own counterparty risk.
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The Arbitrum Foundation supports decentralized governance and ecosystem development around Arbitrum.
Relationship documented by the official source.
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