A Base smart contract audit is a security review of code deployed to Base, carried out against the EVM-equivalent optimistic rollup execution model and written in Solidity — covering both the bug classes shared across OP Stack rollup systems and the failure modes specific to Base.
Base is an OP Stack rollup with consumer-scale usage, which changes the security profile: cheap transactions make griefing affordable, two-second blocks break timing assumptions written for mainnet, and cross-domain messaging introduces an authorisation surface that does not exist on L1.
Contracts ported from mainnet to Base usually work — until they meet an attacker who can afford to spam. Operations that are uneconomic to grief at 30 gwei become trivial at Base fee levels, and loops or per-block work that were bounded by cost on L1 are not bounded on L2.
We review the OP Stack specifics — cross-domain message sender handling, L1 address aliasing, withdrawal and challenge-window assumptions, forced inclusion behaviour — alongside the standard EVM review, and we re-test economic assumptions at Base gas prices rather than mainnet ones.
Base runs on EVM-equivalent optimistic rollup, so it inherits the bug classes below from every system in that family.
Base contracts are written in Solidity. See our Solidity audit methodology.
We fix a commit hash, agree the in-scope contracts and read your architecture docs, then build a threat model: who the actors are, what the trust boundaries are, and which invariants must never break. Nothing is reviewed against assumptions we have not written down.
Line-by-line review by at least two auditors working independently, focused on authorisation, accounting, upgrade paths, external integrations and the gap between what the code does and what the documentation claims it does. Most critical findings come from this phase, not from tooling.
Static analysers appropriate to the language, plus property-based fuzzing and invariant testing to push the system into states no unit test covers. Tooling is used to widen coverage, never to replace the manual pass.
Candidate findings are proven on a forked network with a working proof of concept. We report what an attacker can actually do and what it costs them, not a theoretical severity label.
Every finding gets a severity rating, reproduction steps, the affected code, the impact in concrete terms and a specific remediation. You get a draft for discussion before anything is finalised.
We re-test every remediation against the original proof of concept and check that the fix has not opened a new path. The final report is yours to publish.
The contract review overlaps heavily, but Base adds cross-domain messaging, address aliasing, withdrawal-window assumptions, sequencer behaviour and radically different gas economics — which change which attacks are worth executing.
Partly. The core logic review carries over; the L2-specific surface does not. We run a focused deployment review that covers the delta rather than repeating the whole engagement.
Yes. Sponsored transactions and session keys change what msg.sender means for your authorisation logic, and that is exactly where consumer-app bugs appear.
A repository or contract address, a commit hash to freeze the scope, whatever architecture or spec documentation exists, and a point of contact who can answer design questions. If documentation is thin we will write our understanding of the system back to you and ask you to confirm it — that step alone catches design-level bugs.
A single token contract is 24–48 hours. A typical dApp or mid-sized protocol runs one to two weeks. Large DeFi systems, L2s, bridges and ZK circuits are scoped per project after we have seen the code. We will give you a fixed timeline with the quote, not an estimate that moves.
Yes. Fix review is part of the engagement, not an upsell. We re-run the original proof of concept against your patched code and confirm the fix has not introduced a new path.
Send the repository and a commit hash through the contact form, message @bugtester25 on Telegram, or book a 30-minute scoping call. 200+ protocols audited · $4B+ secured · 0 hacks post-audit. Prefer email? info@safeedges.in.