CCXT is a cryptocurrency exchange trading library that provides a unified API for over 100 exchanges across 7 programming languages (TypeScript/JavaScript, Python, PHP, C#, Go, Java). The core is written in TypeScript from which all other language bindings are transpiled. It implements both REST and WebSocket APIs for market data, trading, and account management. The library normalizes exchange-specific data formats into a common schema, enabling cross-exchange arbitrage and analytics. Key architectural patterns include a base Exchange class with exchange-specific subclasses, a pro/ subdirectory for WebSocket-enabled exchanges, static_dependencies/ for vendored third-party code (ethers, starknet, bip39, etc.), and an extensive test suite with both static and live tests. The repository includes a playground (Next.js web IDE), CLI tool, documentation site (Fumadocs), CI/CD for all languages, and Docker development environment.
PMXT is a unified prediction market SDK that aggregates data and trading across 15+ venues (Polymarket, Kalshi, Limitless, etc.) into a single, consistent interface. The system provides a core TypeScript library with a local sidecar server (Express), plus TypeScript, Python, and CLI SDKs that support both self-hosted and hosted (trade.pmxt.dev) modes. It offers market data (events, order books, trades, OHLCV), WebSocket streaming, order management (create, cancel, fetch), account balance and positions, cross-venue router for event matching and arbitrage, and data feeds (Binance, Chainlink). The architecture is a monorepo with workspaces core, sdks/typescript, sdks/python, sdks/cli, and tools. Each exchange follows a clean fetcher → normalizer → error mapper pattern, and the SDK surfaces are partially generated from the core's method signatures. While primarily an application SDK, the project includes significant data normalization, cross-venue data aggregation, and a router for analytical queries, giving it a hybrid character.
OsEngine is a comprehensive, multi-exchange algorithmic trading platform for desktop (WPF/WinForms hybrid). It provides data downloading (OsData), backtesting (OsTester), walk-forward optimization (OsOptimizer), and live trading (OsTrader) with support for 30+ exchange connectors (MOEX, Binance, Bybit, OKX, Interactive Brokers, etc.). The platform includes a built-in technical indicator library (100+ indicators), a trading robot framework with attribute-based registration, and an MCP (Model Context Protocol) API for external AI/automation control. The architecture is modular: separate executables for different modes, a common server abstraction layer, and a consistent parameter system for bots and indicators. While the codebase is large and well-organized, it suffers from significant duplication across exchange connector entity classes and some copy-paste logic in trading robots. The UI mixes WPF and Windows Forms, and some patterns are legacy. Overall, it is a production-grade algorithmic trading platform with strong engineering practices and a rich feature set.