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OpenCapital
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Connect your AI to the numbers.

Pick your client.

Claude

claude.ai and Claude Desktop. Add a custom connector, sign in once, and ask away.

View setup guide

ChatGPT

Plus, Team, and Enterprise. Create an app in Developer mode and authorize with OAuth.

View setup guide

Cursor

One-click install in the editor. Research companies without leaving your code.

View setup guide

Claude Code

One command adds the server to your terminal. Screen and compare from the command line.

View setup guide

Codex

The OpenAI Codex IDE extension and app, connected through MCP settings.

View setup guide

Codex CLI

One command for the Codex terminal agent, then log in and start asking.

View setup guide

Using something else? Any client that supports remote MCP servers over Streamable HTTP works.

Generic setup

One protocol, every assistant.

MCP is the open standard AI clients use to reach outside data. OpenCapital serves SEC-derived fundamentals through it, read-only and free to query.

How MCP works
Harbor at dusk

Try asking

Questions, answered.

Is the OpenCapital MCP server free?
Yes. Every metric, segment, quarter, and filing reference is free to query, with a free tier of 100 queries a day and no credit card. Paid plans remove the cap.
What data does my AI get?
Fundamentals for thousands of US-listed companies, derived directly from SEC filings: income statement, balance sheet, and cash flow metrics, segment breakdowns, peer comparisons, business overviews, and earnings.
Can it place trades or touch my brokerage?
No. The server is read-only stock research. The only thing your AI can change is your own OpenCapital watchlist, and only if you sign in.
Which AI apps work with OpenCapital?
Claude, ChatGPT, Cursor, Claude Code, Codex, and any other client that supports remote MCP servers over the Streamable HTTP transport.
Where do the numbers come from?
Straight from SEC filings (10-K, 10-Q, and 8-K), extracted and standardized by OpenCapital. Every figure traces back to the filing it was reported in.
What is MCP?
The Model Context Protocol, an open standard that lets AI assistants securely use outside tools and data. OpenCapital hosts an MCP server for you, so there is nothing to install or run yourself.