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OpenCapital
Get started

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

Hermes

Add the remote MCP server and install the hosted research skill from one HTTPS URL.

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OpenClaw

Save OpenCapital as a managed remote MCP server and authorize it through OAuth.

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ChatGPT

Setup for ChatGPT, with Codex app and CLI instructions in the same guide.

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Cursor

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

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Claude Code

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

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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 no credit card. It stays free for casual use, and paid plans are unmetered for heavier workloads.
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, Hermes, OpenClaw, ChatGPT, Cursor, Claude Code, and any other client that supports remote MCP servers over the Streamable HTTP transport.
Where do the numbers come from?
OpenCapital extracts reported financials from company SEC filings and calculates additional metrics from those values. Metric pages show the source or derivation.
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.