What services does Pessimistic offer?

According to its public information, Pessimistic offers: Audit.

Which blockchains does Pessimistic work with?

Pessimistic works with Ethereum.

Which smart contract languages does Pessimistic use?

Pessimistic works with Solidity.

Where is Pessimistic based?

Pessimistic is headquartered in Estonia.

Is Pessimistic verified on smart-contract.com?

Not yet. This listing was compiled from public information and Pessimistic has not claimed it or gone through the vetting process of smart-contract.com.

How can I get a quote from Pessimistic?

Describe your project once on smart-contract.com: you receive comparable quotes from vendors that match it, in the same format. Development and audit are always entrusted to two independent companies.

Vendor

Pessimistic

Tallinn audit firm reviewing Ethereum smart contracts, dApps and protocols, maker of Slitherin

Public information

About

Pessimistic is a smart contract security company operated by Pessimistic OÜ, registered at Narva mnt 7 in Tallinn, Estonia. Its services include smart contract audits, blockchain protocol audits, dApp audits, threat monitoring and a virtual CISO offer, and it features Ethereum smart contract audits as an ecosystem specialty. It describes three ways of working: consulting on pre-production code and architecture, auditing through a combination of manual and automated processes, and a subscription-based retainer for ongoing support. The audit process starts with a proposal, typically within one business day, followed by a deep review of the code both manually and with proprietary automated techniques, a private report shared only with the client, a verification review of the fixes and, once all parties confirm, publication of the report on GitHub. The company maintains Slitherin, an open-source set of more than thirty custom detectors built on top of the Slither static analyser, including integration detectors for popular DeFi protocols, and Spotter, a monitoring product. It publishes an audit cost estimation guide in its GitHub organisation and runs a blog. Its audits cover DEXs, wallets, staking, bridges, games and other DeFi products.

At a glance

Operated by Pessimistic OÜ, Tallinn, Estonia
Combines manual review with proprietary automated techniques
Private report first, then a fix review and a public report on GitHub
Maintains Slitherin, open-source detectors built on Slither
Offers retainers, threat monitoring and a virtual CISO service
Publishes its audit cost estimation method

Services: Audit
Blockchains: Ethereum
Languages: Solidity
Headquarters: Estonia
Website: pessimistic.io(opens in a new tab)
Public audit reports: github.com(opens in a new tab)

Pessimistic: frequently asked questions

What services does Pessimistic offer?: According to its public information, Pessimistic offers: Audit.
Which blockchains does Pessimistic work with?: Pessimistic works with Ethereum.
Which smart contract languages does Pessimistic use?: Pessimistic works with Solidity.
Where is Pessimistic based?: Pessimistic is headquartered in Estonia.
Is Pessimistic verified on smart-contract.com?: Not yet. This listing was compiled from public information and Pessimistic has not claimed it or gone through the vetting process of smart-contract.com.
How can I get a quote from Pessimistic?: Describe your project once on smart-contract.com: you receive comparable quotes from vendors that match it, in the same format. Development and audit are always entrusted to two independent companies.

Where this information comes from

This listing was compiled from the public pages below and last reviewed on September 24, 2026. The company has not claimed it yet, is not a partner of smart-contract.com and has not been vetted.

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