Perimeter

Perimeter is a specialized security research firm focused on delivering the highest quality invariant fuzzing services for blockchain protocols and smart contracts. Founded to unite the world's foremost fuzzing specialists, Perimeter has established itself as a leader in preventing exploits and ensuring the integrity of DeFi protocols.

Core Services

Perimeter offers three main fuzzing engagement types:

Offensive Fuzzing - Flexible timeline engagements that uncover deep-rooted bugs through comprehensive invariant testing with minimal coordination overhead. Includes frequent communication, remediations, and comprehensive reporting with POCs for all High/Critical findings.

Defensive Fuzzing - The highest level of depth with complete documentation, cost-efficient implementation, and seamless integration ready for long-term use. Builds upon offensive fuzzing with enhanced capabilities for continuous protection.

Bespoke Fuzzing - Custom solutions including non-EVM fuzzing, blockchain/DLT fuzzing, dedicated tooling development, and security advisory services tailored to unique protocol requirements.

Key Strengths

Perimeter possesses extensive expertise in fuzzing diverse protocols, from smaller niche projects to some of the largest and most complex in DeFi. The team has developed advanced scaffolding and libraries enabling highly sophisticated fuzzing suites tailored to each protocol's unique challenges.

The firm operates with enterprise hardware and cloud infrastructure through partnerships with Recon, ensuring thorough testing with minimum 50 million instances per invariant. Their methodology focuses on no parallel reviews, full focus guaranteed, with at least one lead fuzzing specialist per engagement.

Perimeter has created open-source tools including Fuzzlib, Arachne, and maintains comprehensive EVM fuzzing resources, contributing to the broader security research community.

Notable Clients and Projects

Perimeter has secured major DeFi protocols including:

• Berachain - Multiple defensive and offensive fuzzing engagements for their innovative proof-of-liquidity L1 blockchain
• Immutable - Defensive fuzzing for zkEVM Bridge contracts
• Origin Protocol - Multiple offensive fuzzing engagements for OETH and WOETH vaults
• Pendle Finance - Comprehensive fuzz testing ensuring contract robustness
• Drips Network - Defensive fuzzing with complete harness development
• Tapioca DAO - Testing reinforcement services

The team has prevented countless exploits through their specialized approach. Real-world impact includes identifying vulnerabilities similar to major hacks like the $46M Kyberswap exploit and $80M RariCapital hack.

Why Choose Perimeter

Perimeter stands out through their uncompromising commitment to quality, consistent communication, and transparency. The team comprises recognized experts including the author of Slither and OG EVM fuzzing specialists who have helped secure companies like Coinbase.

Every engagement includes:

• Stateful and stateless fuzzing suite development using Echidna and Medusa
• Minimum 50 million instances per invariant tested
• POCs for all findings and assertion counterexamples
• Comprehensive final reports with detailed methodology
• Codebase integration via pull request for long-term security
• Optional CI/CD integration and post-launch protection

Perimeter's mission is delivering the absolute best quality services to ensure protocols are secure, collaborating throughout the entire process to meet long-term security needs and surpass expectations.