Sap : A DeFi Token Swap Platform

A full-stack decentralized finance (DeFi) application featuring token swapping, liquidity provision, and staking functionality built with React, Node.js, and Solidity.

Features

• Token Swapping: Trade between two ERC-20 tokens with automated market maker (AMM) functionality
• Liquidity Provision: Add/remove liquidity to earn trading fees
• Token Staking: Stake tokens to earn rewards over time
• Real-time Data: Live price quotes, pool information, and user balances
• Responsive UI: Modern, mobile-friendly interface

Tech Stack

Frontend

• React.js with hooks
• Ethers.js for blockchain interaction
• Tailwind CSS for styling
• Lucide React for icons

Backend

• Node.js with Express
• Ethers.js for contract interaction
• RESTful API endpoints
• CORS enabled for cross-origin requests

Smart Contracts

• Solidity ^0.8.19
• OpenZeppelin contracts for security
• ERC-20 token implementation
• AMM swap contract with 0.3% fees
• Staking contract with reward distribution

Project Structure

defi-platform/
├── contracts/
│   ├── Token.sol          # ERC-20 token and swap contracts
│   └── Staking.sol        # Staking rewards contract
├── backend/
│   ├── server.js          # Express API server
│   ├── package.json       # Node.js dependencies
│   └── .env               # Environment variables
└── frontend/
    └── App.jsx            # React application

Usage

1. Connect Wallet: Click "Connect Wallet" to connect MetaMask
2. Swap Tokens: Enter amount and swap between Token A and Token B
3. Add Liquidity: Provide equal value of both tokens to earn fees
4. Stake Tokens: Stake your tokens to earn additional rewards

Security Features

• ReentrancyGuard protection
• Access control with Ownable pattern
• Safe math operations
• Input validation and error handling

Disclaimer

This is a demonstration project. Do not use in production without proper security audits and testing.