This Market Sizing MCP Server provides end-to-end market research and strategic analysis by exposing 28 tools across three tiers of functionality, 15 business prompts, and seamless integration with eight external data sources. The server supports real-time notifications for market intelligence, data source health, calculation milestones, and performance monitoring, and offers multiple transports (STDIO, HTTP, and Server-Sent Events) to fit various workflows. Core capabilities include TAM/SAM calculations, market size estimation, industry analysis, segmentation, forecasting, and cross-source validation, supported by a curated catalog of tools and smart defaults that enable zero-parameter start. Data access tools pull from Alpha Vantage, BLS, Census, FRED, IMF, Nasdaq Data Link, OECD, and World Bank, with caching to optimize performance. The tool architecture is three-tier: 13 direct data access tools for raw data, 4 basic market tools for foundational analysis, and 11 advanced business analytics tools for in-depth market insights. It also ships with templates for prompts like startup funding, corporate strategy, and ESG analysis to accelerate business decision-making.