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Best Smart Contract Audit Firms

Security firms audit decentralized protocols, smart contracts, and related infrastructure. Methodologies differ. While CertiK combines formal verification with manual inspection and continuous monitoring, PeckShield pairs code audits with penetration testing and live exploit tracking across multiple chains. Coinscope.gg serves as a boundary case in the directory: it tracks project milestones rather than conducting security reviews. Published reports and the exact scope of each evaluation distinguish the listed providers.

Updated Oct 22, 2026 2 picks All security & audit firms
  1. 1
    Formal verification

    CertiK

     3.8/5

    CertiK combines formal verification, manual code review, attack simulation, and remediation guidance for smart contracts and blockchains. Its services include penetration testing and Skynet monitoring across more than 21,000 projects and 100 ecosystems. The firm reports 117,000+ vulnerabilities detected since its 2018 founding and holds SOC 2 Type II compliance alongside ISO 27001 certification. An audit still applies only to the reviewed code and defined scope.

    Smart contract audits · Formal verification +3Publishes audit reportsFormal verificationEVM · Ethereum +4
    • Formal verification and manual review for code audits
    • 117,000+ vulnerabilities detected as of October 2026
    • Penetration testing covers applications, APIs and off-chain systems
    Visit websiteRead review
  2. 2
    DeFi threat monitoring

    PeckShield

     3.8/5

    PeckShield audits smart contracts and protocols, tests decentralized applications and infrastructure, and tracks live exploits through its threat monitoring work. Its supported coverage includes Ethereum, BNB Chain, Arbitrum, Base, and Blast. The firm identified the 2018 BatchOverflow vulnerability and has audited PancakeSwap, Sushi, and dYdX. Pricing and timelines are negotiated for each project, while audits cover a single code snapshot and do not prevent later exploits.

    Smart contract audits · Penetration testing +2Publishes audit reportsEVM · Solidity +3PancakeSwap · Sushi +2
    • Established track record in blockchain security since 2018
    • Discovered foundational vulnerabilities including the 2018 BatchOverflow flaw
    • Audited prominent protocols including PancakeSwap, Sushi, ParaSwap, and dYdX
    Visit websiteRead review

How we picked

The collection uses the security-audits category and has no additional attribute filters. Listings are ordered using the editorial ratings for expertise, track record, transparency, turnaround, and pricing, alongside the stated services and trade-offs. The review considers whether each entry audits code, tests application or infrastructure security, supports formal verification, publishes reports, or provides live monitoring.

  • CertiK and PeckShield qualify through smart contract audits and related security services.
  • Coinscope.gg is retained because it appears in the selected directory set, but its calendar function and lack of audit services are stated clearly.
  • The list contains three entries from the available collection, below the category limit of eight.

FAQ

Which firm offers formal verification?

CertiK offers formal verification alongside manual code review and remediation guidance. Its assessments cover smart contracts and blockchain code.

Which firm tracks live exploits?

PeckShield tracks live hacks, flash-loan exploits, abnormal outflows, and bridge compromises across networks including Ethereum, Arbitrum, and Base. CertiK also provides live project monitoring through Skynet.

Does Coinscope.gg audit smart contracts?

No. Coinscope.gg is an event calendar that filters official project announcements and provides no smart contract audits, code reviews, penetration testing, or formal verification.

What is the main limit of a smart contract audit?

An audit applies to the reviewed code and defined scope. Later upgrades can introduce vulnerabilities, and rushed timelines can limit testing depth.

Which firm offers penetration testing?

CertiK and PeckShield offer penetration testing. CertiK covers Web3 applications, APIs, and off-chain infrastructure, while PeckShield tests decentralized application interfaces and back-end blockchain infrastructure.