Decentralized Marketplace Platform

A comprehensive, secure, and scalable marketplace platform for ERC-721 NFTs and ERC-20 tokens with support for fixed-price listings and auctions.

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Overview

This platform provides a complete ecosystem for NFT and token trading with the following key components:

• CalculatorService: Centralized fee, royalty, and distribution calculations with Chainlink price feed integration
• MarketplaceRegistry: Central registry for managing authorized marketplaces and shared services
• UserStorage: Unified storage for user statistics, transaction history, and blacklist management
• ERC721FixedPriceMarketplace: Marketplace for fixed-price NFT sales
• ERC721AuctionMarketplace: Marketplace for English-style NFT auctions
• ERC20OrderBookMarketplace: Marketplace for ERC-20 token orders

Key Features

Security & Reliability

• UUPS upgradeable contracts for future improvements
• Chainlink price feeds with stale data protection
• Reentrancy guards on all external functions
• Comprehensive input validation
• Owner-controlled blacklists for sellers and royalty recipients

Economic Model

• Configurable marketplace fees (percentage-based with minimum USD amount)
• Royalty support via ERC-2981 standard with configurable limits
• Dynamic fee calculation based on ETH/USD price
• Protection against stale price data with conservative fallback calculations

User Experience

• Unified user statistics across all marketplace types
• Complete transaction history tracking
• Support for multiple marketplace models (fixed price, auction, order book)
• Gas-efficient storage design

Licence

MIT