9 Free Endpoints I Built Into a Financial Data API — With Curl/Python Examples

9 Free Endpoints I Built Into a Financial Data API — With Curl/Python Examples I've been building XFINLAB, a financial intelligence API — market events, sentiment, technical analysis, macro data — with an MCP server for AI agents on top. Along the way I also built a handful of free, no-key tools directly into the site. Sharing the actual working requests here, labeled honestly by which ones you should actually build on vs which are just free site plumbing: 🔑 Official Intelligence API — versioned, X-API-Key auth, documented, part of the paid product. Safe to build a production integration on. 🌐 Free website tool, no key — powers a public page on xfinlab.com directly. No auth, no versioning guarantee, no SLA. Fine for personal scripts, quick lookups, or prototyping — not recommended for anything you depend on staying stable, since it can change without notice the same way any other part of a website's frontend can. AI Chart Analysis 🔑 (also has a free web versio