BOB at a glance.
BOB, short for Build on Bitcoin, launched its mainnet in May 2024 as a hybrid Layer 2 built on the OP Stack that settles to Ethereum and aims to connect Bitcoin liquidity with EVM applications. Here is how it works and what it is used for, not the price.
$9.5M
Value locked in DeFi protocols on BOB. Updated Jun 8, 2026. Source: DefiLlama.
BOB
Used for fees and securing the network. See the live BOB price.
How BOB works.
BOB runs on the OP Stack as an optimistic rollup and settles transactions to Ethereum. In an optimistic rollup, transactions are assumed valid when posted and can be challenged during a dispute window before withdrawals finalize. BOB is part of the OP Superchain, the group of chains built on the OP Stack, and the project describes plans to add Bitcoin security features over time. Gas is paid in ETH.
BOB runs on the OP Stack as an optimistic rollup and settles transactions to Ethereum. In an optimistic rollup, transactions are assumed valid when posted and can be challenged during a dispute window before withdrawals finalize. BOB is part of the OP Superchain, the group of chains built on the OP Stack, and the project describes plans to add Bitcoin security features over time. Gas is paid in ETH.
Hybrid design
BOB describes itself as a hybrid Layer 2 that aims to combine access to Bitcoin liquidity with the EVM application environment used on Ethereum.
OP Stack and Superchain
BOB is built on the OP Stack and is part of the OP Superchain, the group of chains that share Optimism technology and settle to Ethereum.
Optimistic rollup
Transactions are posted to Ethereum and assumed valid unless challenged during a dispute window, after which withdrawals finalize.
ETH for gas
Users pay transaction fees in ETH. The BOB token is used for staking and governance rather than as the gas currency.
What BOB is used for.
The network hosts EVM applications that aim to bring Bitcoin liquidity into decentralized finance.
Bitcoin DeFi
BOB targets decentralized finance applications that work with Bitcoin liquidity inside an EVM environment.
EVM contract deployment
Because BOB is EVM compatible and built on the OP Stack, developers can deploy contracts with familiar Ethereum tooling.
Lower-cost transactions
Settling to Ethereum as a rollup lets users transact at lower fees than transacting directly on Ethereum mainnet.
Hold, swap and spend BOB.
BOB is integrated in Zypto App. Hold BOB in self-custody, swap it to any supported asset, and use it across Zypto’s features.
Be the reason BOB ships next.
BOB isn’t in Zypto App yet. Post the request to your followers, chains with the most demand get prioritised.
Request on XCommon questions.
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