X3 Security

• Name: X3 Security
• URL: https://github.com/X3-Security
• Category: smart-contract security company / GitHub-native audit-report operator / checklist-and-public-assurance workflow shell
• Summary: X3 Security belongs in companies/, not only projects/, because the useful question is not just what PDF reports exist? but which named operator curates report publication, scopes review style, defines audit-checklist expectations, and turns a public GitHub archive into reusable assurance infrastructure that other teams may start treating as trust evidence? The practical leverage sits less in a single branded website than in the company-run publication and methodology boundary: which reports get exposed, how risk is summarized, and what checklist or review habits downstream builders inherit.
• What it does:
  • Presents itself as a web3 security company focused on smart-contract and blockchain-project auditing
  • Maintains a public GitHub repository of PDF audit reports for projects such as Mondrian Wallet, Steadefi, Caviar Private Pools, and a Foundry Stablecoin example
  • Documents a repeatable audit-report structure covering protocol summary, disclaimer, risk classification, audit details, executive summary, and findings
  • Uses a public website codebase tied to x3sec.xyz that sends visitors directly to the GitHub-hosted report archive instead of building a more closed marketing shell
  • Exposes adjacent public materials such as an Audit Checklist repository and challenge/tooling repos, which makes X3’s methodology and training surfaces part of the package rather than pure client-delivery residue
• Key claims:
  • The website source says X3 Security is “Protecting Web3 Since 2024” and describes the firm as an emerging web3 security company specializing in blockchain technology and smart-contract security
  • The same site advertises “High Quality Audits,” “Professional Service,” “Pay Per Vulnerability Basis,” and “Affordable” pricing language, which signals a distinct operator and engagement model
  • The Security-Audit-Reports README says the repo showcases comprehensive security audit reports for various blockchain protocols and web3 projects and explicitly documents the structure each report follows
  • The website source includes a View Our Reports button linking directly to the public reports repository, showing that public-report publication is a first-class part of the firm’s trust surface
  • The GitHub organization also surfaces an Audit-Checklist repository described as a smart-contract auditing checklist for DeFi vulnerabilities, which makes X3’s review heuristics reusable beyond any one paid engagement
  • The website repo’s CNAME points to x3sec.xyz, indicating the organization intended a custom-domain public site even though the domain did not resolve during the earlier retrieval pass
• Whitepaper: No classic standalone X3 Security whitepaper is the important artifact here. The clearest current primary materials are the GitHub organization, the public audit-report repository, and the public website source repository tied to x3sec.xyz; the prior capture in ../whitepapers/x3-security-primary-sources-2026-05-07.md remains the compact source bundle.
• Sources:
  • https://github.com/X3-Security
  • https://github.com/X3-Security/Security-Audit-Reports
  • https://raw.githubusercontent.com/X3-Security/Security-Audit-Reports/main/README.md
  • https://github.com/X3-Security/X3-Security.github.io
  • https://raw.githubusercontent.com/X3-Security/X3-Security.github.io/main/CNAME
  • https://raw.githubusercontent.com/X3-Security/X3-Security.github.io/main/index.html

Internal linkages

• Project-layer alias: x3-security.
• Useful adjacent company/operator reads: oak-security, adevar-labs, and trail-of-bits.
• Useful contrast where the nonprofit coordination and framework operator matters more than the assessor: security-alliance-seal.

Protocol / company boundary

• There is no especially useful standalone X3 Security protocol doing the analytical work here.
• The meaningful surface is a company-run public-assurance shell: report publication, audit-structure design, checklist authorship, and the trust effects of a GitHub-first audit archive that users or clients may treat as evidence.
• That is why X3 Security belongs in companies/: the control question is who steers the publication and review-methodology boundary, not what neutral protocol primitive supposedly replaces that judgment.

Control surface

• Practical leverage sits in engagement scoping, public-report publication, audit-structure normalization, checklist authorship, and the visibility choices that determine what outside users can independently inspect.

• X3 does not directly control the client protocols it reviews, but its operator decisions can still shape what teams present as security evidence and what bug classes reviewers learn to look for.

• Read X3 Security as a GitHub-native audit-publication and review-methodology company first, not as a protocol.

• Last reviewed: 2026-08-07 UTC