Search "stock market MCP server" and most results are tutorials about building one yourself, or MCP servers that just wrap a generic price quote. Quantustik runs an actual finance MCP server in production — here is what's live, how it's discovered, and how an agent connects to it.
Model Context Protocol (MCP) is an open standard for connecting an AI agent to external tools and data over a structured interface, instead of the agent guessing how to scrape a web page or hand-roll an API integration for every service it needs. A server exposes a set of typed tools (function calls with defined inputs/outputs), resources, and guided prompts; any MCP-speaking client — Claude, or another compatible agent runtime — can discover and call them the same way regardless of which server it is talking to.
Quantustik hosts an MCP server at quantustik.com/mcp using the streamable-HTTP transport — no API key required to start, an optional free key raises rate limits. The server is discoverable through a standard manifest at /.well-known/mcp.json, which lists the transport, the anonymous rate limit, and where to get an optional key — exactly the metadata an agent needs to connect without a human reading docs first.
Every tool is callable anonymously under an hourly per-IP rate cap; an optional free API key raises the limits for heavier use.
The tools cover a market overview, market indicators and the Fear & Greed index, per-ticker indicators, the earnings calendar, a correlation map, insider activity, SEC filing digests and year-over-year filing language changes, and institutional holdings. The tool set is described qualitatively here rather than with a hardcoded count, because it grows: browse the manifest and the developer docs for the always-current list.
This is a read-only data-access layer, not a trading connection: no tool places or manages an order, and no autonomous trading is wired to it anywhere. It also does not make the underlying data any better: MCP is the pipe, and every number an agent pulls through it carries the date it was published.
MCP is a data-access protocol, not a source of insight: it changes how an agent reaches Quantustik's data, not how reliable the underlying sources are. Every tool is read-only — no order is ever placed or managed through it. Every tool is callable without an API key under an hourly per-IP cap; an optional free key raises the limits. Current quotas are on the developers page, not restated here since they change.
Educational research only — not investment advice.