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Pessimistic

Smart contract and protocol security audits plus threat monitoring for blockchain projects and DeFi teams

Tallinn, EstoniaFounded 2021pessimistic.ioWebsite technologies

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Highlights

  • New on EvolcAdded 2026-10-28

About Pessimistic

Pessimistic is a blockchain security company offering smart contract audits, blockchain protocol audits, dApp audits, vCISO services and threat monitoring. It maintains Slitherin, a set of open-source vulnerability detectors built on the Slither framework, and develops Spotter, a monitoring system that aims to detect potential exploits early, often before they reach the blockchain.

Its clients are blockchain projects and DeFi protocols; testimonials on the site come from Zerion, 1inch, Azuro and Resolv. Services are sold as project audits, pre-production consulting and subscription-based retainers. Audits follow a process of private reports, code updates, a second verification review and a public report published on GitHub.

The registered company is Pessimistic OÜ, based in Tallinn, Estonia, and founded in 2021. The website states 400+ security audits delivered, 250,000+ lines of code audited and 2,600+ issues found, and describes a team of 15 experts. It also says its code security processes date back to 2017.

Product: Smart contract audits, blockchain protocol audits, dApp audits, vCISO, threat monitoring (Spotter) and Slitherin detectors

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