# 0xDarkArt

> Independent smart contract auditor and security-first Web3 developer. Pre-launch smart contract audits, DeFi security reviews, and audit-grade dApp development for teams shipping on EVM chains. Public track record across private audits (Shieldify/Pear Protocol), Code4rena and CodeHawks contests, and Sherlock contest judging. Also the founder of NumDojo (https://numdojo.com), a solo-built math learning SaaS.

Pricing is public: audits from $3,000 (about $500 per 100 SLOC, adjusted for complexity); development from $5,000.

## Services

- [Smart Contract Audits](https://www.0xdarkart.xyz/services/audits): manual line-by-line security review with severity-ranked findings, remediation guidance, and fix verification. From $3,000.
- [Full-Stack Web3 Development](https://www.0xdarkart.xyz/services/development): contracts, frontend, and complete dApp builds by a developer who audits. From $5,000.

## Proof of work

- [Pear Protocol Security Audit](https://www.0xdarkart.xyz/portfolio/pear-protocol): Team security audit of DeFi lending protocol
- [AI Arena - Code4rena Competition](https://www.0xdarkart.xyz/portfolio/ai-arena): Public audit competition for AI-powered gaming platform
- [Foundry DeFi Stablecoin](https://www.0xdarkart.xyz/portfolio/foundry-defi-stablecoin): CodeHawks audit competition for algorithmic stablecoin
- [NumDojo — Speed Math Learning Platform](https://www.0xdarkart.xyz/portfolio/numdojo): Founder project: solo-built learning SaaS with real-time math battles

## Writeups

- [Shipping a Real-Time Multiplayer SaaS Solo: What Building NumDojo Taught Me](https://www.0xdarkart.xyz/writeups/shipping-a-realtime-saas-solo): What it actually took to build NumDojo alone: a 50+ table PostgreSQL schema, SM-2 spaced repetition, Socket.io duels with ELO matchmaking, and Stripe billing.
- [Pear Protocol: A Fee Setter That Erased Every Referrer Payout](https://www.0xdarkart.xyz/writeups/pearlabs-referrer-fee-overwrite): A smart contract audit finding from the Pear Protocol V1 review with Shieldify: how an overwrite instead of an add silently deleted every pending referrer fee.
- [How to Prepare Your Contracts for an Audit](https://www.0xdarkart.xyz/writeups/how-to-prepare-for-a-smart-contract-audit): What actually makes a smart contract audit faster and better, from the auditor reading your code: freeze scope, write the intent down, ship tests, and run the free tools first.
- [How I Use Foundry in Smart Contract Audits](https://www.0xdarkart.xyz/writeups/how-i-use-foundry-in-audits): How I actually use Foundry on a smart contract audit: writing proof-of-concept exploit tests, poking at contracts with Anvil and cast, and running gas reports.
- [How I Actually Audit a Smart Contract](https://www.0xdarkart.xyz/writeups/how-i-audit-a-smart-contract): My real smart contract audit process, start to finish: docs before code, why tests are gold, automated first, then manual function-by-function tracing.
- [A Hardcoded Health Factor That Liquidates Healthy DeFi Positions](https://www.0xdarkart.xyz/writeups/defi-stablecoin-hardcoded-health-factor-liquidation): A smart contract audit finding from my first CodeHawks contest: how a hardcoded 1e18 health factor can liquidate well-collateralized stablecoin positions.
- [AI Arena: Hand-Picking Rare Fighter NFTs via redeemMintPass](https://www.0xdarkart.xyz/writeups/ai-arena-mint-pass-attribute-manipulation): A smart contract audit finding from my AI Arena Code4rena audit: how redeemMintPass let players hand-pick rare fighter attributes and mint Dendroids at will.

## Contact

- Email: contact@0xdarkart.xyz
- Contact form: https://www.0xdarkart.xyz/contact
- X: https://x.com/0x_Darkart
- GitHub: https://github.com/Darkartt
- Code4rena: https://code4rena.com/@Velislav4o