StockX – Decentralized AI-Powered Stock Exchange

StockX is a decentralized, AI-powered stock exchange platform designed to enable secure, transparent, and near-real-time trading of tokenized equities. By combining blockchain-based settlement, smart contract automation, decentralized identity, and AI-driven market intelligence, StockX removes traditional intermediaries while preserving regulatory compliance and institutional-grade reliability.

🎯 Key Features

• 🪙 Tokenized Equities: ERC-20/ERC-1400 security tokens representing real-world equities with fractional ownership
• ⚡ High-Performance Matching: Off-chain matching engine for fast order processing and low-latency trades
• 🤖 AI-Powered Insights: Market intelligence, sentiment analysis, and personalized trading recommendations
• 🔐 Compliance & Security: On-chain KYC/AML enforcement with decentralized identity (DID)
• 🏛️ DAO Governance: Token-holder voting on protocol upgrades, fee structures, and market parameters
• ⚖️ Transparent Settlement: Atomic trade settlement with delivery-versus-payment (DvP) logic

📋 Table of Contents

• Architecture
• Tech Stack
• Getting Started
• Project Structure
• Development
• Smart Contracts
• AI Services
• Contributing
• License

🏗️ Architecture

StockX follows a hybrid on-chain / off-chain architecture:

Users & Institutions
        ↓
Frontend (Web / Mobile)
        ↓
Backend APIs & Relayers
        ↓
Off-chain Matching Engine + AI Services
        ↓
Smart Contracts (EVM)
        ↓
Blockchain Ledger & DAO Governance

Architecture Layers

1. On-Chain Layer: Trust, ownership, settlement, and governance
2. Off-Chain Layer: Performance-critical logic, AI computation, and user experience
3. Integration Layer: External data providers, compliance services, and custodial systems

🛠️ Tech Stack

Blockchain & Smart Contracts

• EVM-compatible chain (Ethereum L2 / Besu-based permissioned network)
• Solidity with OpenZeppelin libraries
• Hardhat for development and testing

Backend

• Node.js + Express (JavaScript)
• Event-driven architecture
• WebSocket for real-time updates
• Redis for caching
• PostgreSQL for data persistence

Frontend

• React + TypeScript
• Tailwind CSS for styling
• Framer Motion for animations
• Recharts for data visualization
• Wallet integration (Web3)

AI & Data Services

• Python + FastAPI
• NLP & ML models for sentiment analysis
• Streaming data pipelines
• Portfolio optimization algorithms

Infrastructure

• Docker & Docker Compose for containerization
• Kubernetes for orchestration
• Terraform for infrastructure as code
• Prometheus for monitoring
• GitHub Actions for CI/CD

🚀 Getting Started

Prerequisites

• Node.js >= 18.0.0
• Python >= 3.9
• Docker & Docker Compose (optional)
• Git

Installation

1. Clone the repository

   git clone https://github.com/your-org/stockx.git
   cd stockx

2. Install dependencies

   Root dependencies:

   npm install

   Frontend:

   cd frontend
   npm install
   cd ..

   Backend:

   cd backend
   npm install
   cd ..

   Smart Contracts:

   cd smart-contracts
   npm install
   cd ..

3. Install Python dependencies

   cd ai-services
   pip install -r requirements.txt
   cd ..

4. Set up environment variables

   Copy .env.example files in respective directories and configure:

   • frontend/.env
   • backend/.env
   • smart-contracts/.env
   • ai-services/.env

Running Locally

1. Start the backend

   cd backend
   npm run dev

2. Start the frontend

   cd frontend
   npm run dev

3. Start AI services (optional)

   cd ai-services
   python -m uvicorn src.api.main:app --reload

4. Run smart contracts locally

   cd smart-contracts
   npx hardhat node

Take-Home Update: Market Summary Endpoint

This submission adds a read-only backend endpoint:

GET /api/market/summary

The endpoint returns exactly these top-level JSON fields:

{
  "tokensListed": 247,
  "totalTrades": 5432,
  "totalVolume": "12400000",
  "generatedAt": "2026-04-28T15:17:12.209Z"
}

Implementation files:

• backend/src/controllers/market.controller.js
• backend/src/routes/market.routes.js

To test locally:

cd backend
npm run dev

Then call the endpoint from another terminal:

curl -s http://localhost:3001/api/market/summary

Run the curl command twice to confirm generatedAt changes between requests.

📁 Project Structure

stocks/
├── frontend/              # React frontend application
│   ├── src/
│   │   ├── components/    # React components
│   │   ├── contexts/      # React contexts
│   │   ├── services/      # API services
│   │   └── utils/         # Utility functions
│   └── package.json
│
├── backend/               # Node.js backend API
│   ├── src/
│   │   ├── controllers/   # Request handlers
│   │   ├── services/      # Business logic
│   │   ├── middleware/    # Express middleware
│   │   ├── models/        # Data models
│   │   └── routes/        # API routes
│   └── package.json
│
├── smart-contracts/       # Solidity smart contracts
│   ├── contracts/
│   │   ├── core/          # Core contracts (TokenizedStock, OrderBook)
│   │   ├── compliance/    # Compliance contracts
│   │   ├── governance/    # DAO governance
│   │   └── oracles/       # Price oracles
│   ├── test/              # Contract tests
│   └── scripts/           # Deployment scripts
│
├── ai-services/           # Python AI services
│   ├── src/
│   │   ├── analytics/     # Market analysis
│   │   ├── sentiment/     # Sentiment analysis
│   │   ├── models/        # ML models
│   │   └── api/           # FastAPI endpoints
│   └── requirements.txt
│
├── infrastructure/        # DevOps configuration
│   ├── docker/            # Dockerfiles
│   ├── kubernetes/        # K8s manifests
│   ├── terraform/         # Infrastructure as code
│   └── ci-cd/             # CI/CD pipelines
│
├── docs/                  # Documentation
│   ├── api/               # API documentation
│   ├── architecture/      # Architecture docs
│   ├── deployment/        # Deployment guides
│   └── user-guide/        # User guides
│
├── scripts/               # Utility scripts
├── shared/                # Shared types and utilities
└── README.md

💻 Development

Running Tests

Backend tests:

cd backend
npm test

Smart contract tests:

cd smart-contracts
npx hardhat test

AI services tests:

cd ai-services
pytest tests/

Code Style

• JavaScript: ESLint
• TypeScript: ESLint + TypeScript compiler
• Solidity: Solhint
• Python: Black + Flake8

Building for Production

Frontend:

cd frontend
npm run build

Backend:

cd backend
npm run build

Smart Contracts:

cd smart-contracts
npx hardhat compile

🔐 Smart Contracts

The platform uses several core smart contracts:

• TokenizedStock: ERC-20 security tokens with compliance checks
• OrderBook: Trade settlement and order matching coordination
• ComplianceRegistry: KYC/AML status management
• CustodyVault: Multi-signature custody for assets
• DAO: Governance and voting system
• PriceOracle: External price feed integration

See smart-contracts/README.md for detailed documentation.

🤖 AI Services

The AI layer provides:

• Sentiment Analysis: News, social media, and earnings report analysis
• Signal Generation: Bullish/bearish indicators and trading signals
• Price Prediction: ML-based price forecasting
• Portfolio Optimization: Risk-adjusted portfolio recommendations

See ai-services/README.md for more details.

📚 Documentation

• API Documentation
• Architecture Guide
• Deployment Guide
• User Guide
• Security Documentation

🤝 Contributing

We welcome contributions! Please see our Contributing Guide for details.

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

👥 Team

Developed by the StockX team at LynqEx Labs:

• Alex Chen - AI/ML Engineer
• Sarah Martinez - Full Stack Developer
• David Kim - DevOps/Infrastructure
• Emma Wilson - Technical Writer
• Michael Brown - Smart Contract Developer

📞 Contact

For questions and support:

• Email: support@lynqexlabs.com
• Website: https://lynqexlabs.com
• Documentation: See docs/ directory

🙏 Acknowledgments

• OpenZeppelin for security-tested smart contract libraries
• Chainlink for oracle solutions
• The Ethereum community for inspiration and tools

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Note: This is a Proof of Concept (PoC) implementation. Production deployment requires additional security audits, compliance reviews, and infrastructure hardening.