Three Sigma is a Web3 security company positioned as a blockchain security and DeFi audit partner. Its services cover smart contracts, dApps, cross-chain bridges, blockchain protocols, OpSec, as well as risk assessments for economic models, Tokenomics, DAOs, staking, and more. According to its website, it has completed 150+ audits, protected $10B+ in client assets, and identified 300+ critical/high-severity issues.
Its audits go beyond automated scanning, with an emphasis on manual line-by-line code review, static analysis, fuzz testing, mainnet fork simulations, PoC reproduction, and attack path modeling. It covers a broad range of languages and ecosystems, including Solidity/EVM, Rust/Solana/NEAR, and Move/Sui/Aptos. It can also review frontends, backends, APIs, cross-chain relayers, oracles, governance, and treasury processes. In terms of deliverables, reports include severity rankings, code references, remediation recommendations, and minimal-change fix proposals. It also supports PR review, patch retesting, and a final shareable audit status. Extended services include continuous monitoring, real-time alerts, incident response consulting, and bug bounty program management.
Pricing is based on custom quotes. After a project submits its codebase and timeline, the team provides scope, pricing, and an estimated start date within 24โ48 hours. The website states that smart contract audits typically range from $10K to $75K+, depending on complexity. A typical Web3 audit takes around 1โ3 weeks, while smart contract audits can take 1โ6 weeks.
The main strengths are its coverage across technical, economic, and operational risk layers, support for multiple chains and languages, and post-audit retesting plus public launch-ready proof. It is well suited to projects that need credibility with investors, exchanges, or communities. The drawbacks are that the website does not disclose compliance certifications, SLA terms, payment methods, or specific support channels. Since the service is centered on expert-led audits, the budget and scheduling requirements may be challenging for early-stage small teams, and it is not ideal for general-purpose cybersecurity needs in traditional enterprises.
Three Sigma is best suited for teams working on DeFi, DAOs, cross-chain bridges, staking, governance, infrastructure, NFT/GameFi/RWA, and similar on-chain projects preparing for mainnet launch, major upgrades, or due diligence. Access from mainland China and payment availability are not specified in the main content, so they should be considered unknown. If localized communication or guaranteed access from within China is needed, teams may compare domestic or Asia-based alternatives such as SlowMist and PeckShield, while also evaluating international audit firms such as CertiK, Trail of Bits, OpenZeppelin, and Halborn.
โ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on threesigma.xyz official site.
threesigma.xyz is an Portugal Cybersecurity provider. TG4G tracks its product information, an overall rating of 8.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach threesigma.xyz directly.