Base is an Ethereum layer 2 network built on the OP Stack, the same open-source rollup framework as Optimism. It executes transactions off Ethereum, posts their data back to it and inherits the optimistic rollup security model. For a project, it offers Ethereum-style development at lower transaction cost, with the rollup assumptions that come with it.
Building on Base
Base is EVM-equivalent: Solidity and Vyper contracts compile and behave as on Ethereum, and the usual development tools work unchanged. A single sequencer orders transactions, bridge and messenger contracts connect Base to Ethereum, and withdrawals to Ethereum finalize after a challenge period. Many projects deploy the same codebase on Base and on other EVM networks, which makes consistent configuration across chains a recurring concern.
- Languages: Solidity, Vyper
- Frameworks: Foundry, Hardhat
- Fees combine L2 execution gas with the cost of posting data to Ethereum
What auditors look at
- Sequencer assumptions: impact of downtime or delayed transactions on liquidations, auctions and time-sensitive logic
- Cross-domain messaging with Ethereum: authentication of the messenger and original sender, failed or replayed messages
- Bridged tokens: whether the contract accepts the canonical bridged version, a wrapped variant, or both
- Multichain deployments: addresses, roles and parameters that must be set correctly on each network
- Classic EVM risks such as reentrancy, oracle manipulation and access control, which remain the main sources of findings
Before requesting quotes
- List every network where the code will run and the per-chain differences in configuration
- Document the oracles, bridged assets and external protocols your contracts rely on
- Describe how the system should behave if the sequencer stops or withdrawals are delayed
- Provide a test suite that runs against a fork of the network where external integrations matter