Building FinMCP: A Free Financial Data MCP Server for Global Markets (Including ASX)

TL;DR — I built a MCP server that connects Claude and other AI assistants to live financial data across any market. No API keys, free forever, open source. Works for US stocks, ASX, crypto, forex — everything Yahoo Finance covers. The Problem: AI That Doesn't Know Today's Market Here's the thing nobody mentions when you start using AI for investing decisions: your AI model has a knowledge cutoff. It doesn't know what happened in the market yesterday, last week, or last month. I'm constantly asking Claude things like: "How does VAS compare to A200 over the last 5 years?" "What's the analyst consensus on this ASX stock right now?" "Show me the free cash flow trend for this company." And I'd get answers that were weeks old or completely fabricated. The Solution: FinMCP : I discovered Yahoo Finance has an undocumented free API that supports everything — US stocks, ASX, LSE, TSE, crypto, forex, global ETFs. No API key required. The yahoo-finance2 npm library handles all the authentication.