EntityEngine
Smart Contract Audit

OpenZeppelin

The trusted standard for smart contract security — library creators and auditors of the ecosystem's foundations

Buenos Aires, Argentina (distributed globally)Est. 2015100+ security engineers
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Quick Facts

Best For
DeFi protocols and token projects using OpenZeppelin libraries, or any project where the audit credential needs to be recognisable to sophisticated DeFi users
Typical Engagement
3–10 weeks; pricing reflects premium positioning

Overview

OpenZeppelin occupies a unique position in smart contract security — as the creators of the most widely used smart contract library in existence (used in tens of thousands of projects), the firm has unparalleled visibility into how Solidity code actually behaves in production. This makes OpenZeppelin audits uniquely valuable: their security engineers have reviewed more production code than any other firm, and their pattern recognition for vulnerability classes is unmatched. The firm audited Compound, Aave, and Uniswap — the three protocols that defined DeFi.

Focus Areas

Solidity Smart Contract AuditsDeFi Protocol SecurityOpenZeppelin Library IntegrationToken Contract AuditsAccess Control ReviewUpgrade Pattern Security

Who They Work With

DeFi ProtocolsMajor Token IssuersEnterprise Blockchain TeamsProjects Building on OpenZeppelin Libraries

Notable Audits

CompoundAaveUniswapVarious foundational DeFi protocols

How to Engage

Request via openzeppelin.com; long waitlist expected for premium projects

Frequently Asked Questions about OpenZeppelin

How long does an OpenZeppelin audit typically take?
OpenZeppelin audits run from 3 to 10 weeks depending on codebase size and complexity. The firm prioritises thoroughness over speed — its audit process involves multiple researchers reviewing the same codebase independently, which adds time but significantly improves the quality of findings. Teams should plan for 8-12 weeks minimum lead time to account for scheduling, the audit itself, and remediation review.
How much does an OpenZeppelin audit cost?
OpenZeppelin's pricing reflects its premium positioning — specific figures are available via scoping discussion, but expect costs in the six-figure range for significant DeFi protocols. The firm has audited Compound, Aave, and Uniswap — the three protocols that defined DeFi — and its credential carries recognisable signal to sophisticated users and institutional investors that justifies the premium.
Is there a waitlist for OpenZeppelin audits?
Yes — a long waitlist is expected for premium projects, given OpenZeppelin's reputation and limited researcher capacity. Teams should engage the firm as early as possible — 3-6 months before a needed audit completion is not excessive for complex protocols. The contact process via openzeppelin.com initiates the scoping and scheduling discussion.
What makes OpenZeppelin uniquely qualified to audit DeFi contracts?
OpenZeppelin created the most widely-used smart contract library in existence — used in tens of thousands of projects globally. Their security engineers have reviewed more production Solidity code than any other firm, giving them unmatched pattern recognition for how OpenZeppelin library components behave in complex DeFi compositions. This institutional memory of production code behaviour is impossible to replicate without the same volume of real-world contract review.
What notable DeFi protocols has OpenZeppelin audited?
OpenZeppelin audited Compound, Aave, and Uniswap — the three protocols that defined the DeFi ecosystem. These audits represent some of the highest-stakes smart contract security work in history, given the billions in TVL these protocols have held. A project audited by OpenZeppelin shares a credential lineage with the foundational protocols of DeFi.
Does OpenZeppelin only audit contracts built with its own libraries?
No — OpenZeppelin audits all Solidity smart contracts regardless of whether they use OpenZeppelin libraries. However, projects that do use OpenZeppelin's library components benefit from the firm's particularly deep knowledge of how those specific components behave, including edge cases and known integration patterns. Non-OpenZeppelin codebases are fully within scope for audit.

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