Category: GitHub-first web3 security firm / public audit-report archive / audit-checklist and lightweight security-tooling ecosystem
Summary: X3 Security is better cataloged as a GitHub-first security-review and knowledge surface than as a conventional marketing-led audit boutique. Its public website source tied to x3sec.xyz points visitors directly to a GitHub-hosted report library, while the main audit-report repository acts as a transparent archive of PDF reports for several protocols and explicitly documents the structure of those reports. The GitHub organization also exposes adjacent public materials such as an audit checklist and challenge/tooling repos. That combination makes X3 Security look like a lightweight but public security infrastructure node built around open audit artifacts and GitHub-native trust surfaces rather than a closed-door consultancy with little visible output.
What it does:
Presents itself as a web3 security company focused on smart-contract and blockchain-project auditing
Publishes 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 markets the firm as “Protecting Web3 Since 2024” and sends visitors to the public reports repository
Maintains adjacent GitHub repos for security education or tooling, including an Audit Checklist repository and challenge-oriented materials surfaced on the org page
Key claims:
The website source says X3 Security is “Protecting Web3 Since 2024” and describes the firm as an emerging web3 security company
The website source says X3 specializes in blockchain technology and smart-contract security and offers “comprehensive solutions” and “top-tier security assessments” for decentralized applications
The website source advertises “High Quality Audits,” “Professional Service,” “Pay Per Vulnerability Basis,” and “Affordable” pricing language
The website source includes a “View Our Reports” button that links directly to the public Security-Audit-Reports GitHub repository
The Security-Audit-Reports README says the repo showcases comprehensive security audit reports for various blockchain protocols and web3 projects and frames transparency and thorough assessments as the goal
The same README says each report includes a protocol summary, disclaimer, risk classification, audit details, executive summary, and findings
The GitHub org page publicly surfaces the audit-report repository and an Audit-Checklist repo described as “A smart contract auditing checklist for Defi vulnerabilities”
The website repo’s CNAME points to x3sec.xyz, indicating the org intended a custom-domain public site even though that domain did not resolve during retrieval in this pass
Whitepaper: No canonical standalone X3 Security whitepaper or litepaper surfaced in this pass. The clearest current first-party sources of truth were the GitHub organization, the public audit-report repository, and the public website source repository tied to x3sec.xyz; see ../whitepapers/x3-security-primary-sources-2026-05-07.md.