DeFi Security

Full-stack web3 security services delivered by top-tier ethical hackers with a focus on the real financial impact


We contribute to the Web3 security by creating the tools that help to automate the security audit.

Semgrep Solidity Rules

Semgrep rules that will help you to find the typical vulnerable patterns in the smart contract code.


Contract Diff

Smart diff tool that helps you to understand which code the protocol has been forked from and what exactly has been changed.


ABI Decompiler

Reverse Engineering tool that helps you to efficiently match the function selectors in the EVM bytecode to the function signatures.



Apart from the open source tools, we're developing a comprehensive solution for the Web3 security monitoring and vulnerability assessment


Web3 protocol monitoring solution powered by our transaction analysis engine txfilter and our Semgrep SAST rulepack.

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More information about our key product DeFiMon

Vulnerability Scanning

We create custom-tailored SAST rulepacks to detect vulnerabilities in CI/CD pipelines as well as in the newly deployed contracts with a very low false-positive rate.

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Exploit Detection

DeFiMon includes the component called txfilter — a high perfomance transaction analysis engine written in Rust with its own DSL for describing the rules.

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Custom rules

The txfilter's DSL allows to precisely describe custom rules to alert about the project-specific events.

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The dashboard contains statistics about the vulnerabilities detected in code as well as the suspicious transactions and other dangerous events. We constantly monitor all the chains to detect new exploitable issues in all the new contracts.

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Why Decurity?

We are a team of veteran hackers who dived into the blockchain and smart contract security in the early days. Under our supervision, an audit is not just a filing of the checklist but rather a full-fledged research.

  • Multiple world CTF hacking champions
  • Top-50 hackers worldwide according to HackerOne
  • Discovered critical issues during 90% of engagements
  • Blockchain security experts with proven record since 2017

Our Customers

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