This repository is a self-contained Python library (packaged as a single SKILL.md file) that provides over 50 endpoints for accessing US and global stock market data from 17 different sources, all without API keys. It implements a 16-layer architecture covering real-time quotes, historical K-lines, technical indicators (MA, MACD, RSI, KDJ, Bollinger), fundamentals (financial statements, key metrics), fund flow, options chains with full Greeks (CBOE), short volume and short interest (FINRA), SEC EDGAR filing stream and full-text search, market-wide screener (EDGAR frames), global rates and FX (BIS, ECB, NY Fed, Fed, Treasury), volatility indices (VIX), insider trades (Form 4), institutional holdings (13F), Taiwan stock exchange data, and energy prices/inventories (EIA). The code is designed to be used by AI coding assistants like Claude Code, Codex, and OpenClaw, with embedded Python that can be directly executed. It includes a thread-safe rate limiter, automatic Yahoo crumb management, and comprehensive error handling with clear exception semantics (DataNotAvailable vs RuntimeError vs ValueError). Each data source is labeled with a compliance tier (S/B/C/D) based on actual terms of service, with verbatim quotes from the source terms.