Connect your AI

Connect to Cursor

Ask about any US public company and get the real numbers back — revenue, margins, segments, a decade of history. Your assistant stops hallucinating figures and answers from live, verified data, grounded in what each company actually reported. So you can dig into a business, size it up against peers, and chase any question as far as the filings go — with every number traceable to where it came from.

Cursor, the AI code editor, speaks the Model Context Protocol (MCP), so it can pull live fundamentals from OpenCapital in any chat. Add it once with the button below, or set it up manually in seconds.

Add OpenCapital to Cursor

One click opens Cursor and pre-fills the server. You'll still authorize once.

How to connect

Add the server to Cursor

Two interchangeable ways to register OpenCapital — use whichever you prefer.

Open Cursor Settings → Tools & MCP → New MCP Server, choose Streamable HTTP, name it OpenCapital, and paste the connector URL below.

https://api.opencapital.sh/mcp

Authenticate with OpenCapital

In Tools & MCP, enable the OpenCapital server and click Connect. Cursor opens your browser to sign in (Google) and approve read-only access — a green dot means it's connected.

Now just ask.

You're all set. Ask Cursor about fundamentals, segments, or peer comparisons in any chat — it'll call OpenCapital as needed, right alongside your code.

Cursor calls OpenCapital automatically — no special prefix needed.

Try asking

Lives in your editor

Works in any recent Cursor build with MCP support. Data is read live as you work.

Read-only by design

Exposes read-only research data from public SEC filings. Cursor cannot place trades or change any account.

Troubleshooting

My AI doesn't see OpenCapital's tools

Make sure the connector is added, enabled, and signed in. Still nothing? Ask it to “use the OpenCapitalMCP server” — in ChatGPT, start the message with @OpenCapital.

The sign-in window didn't open

Authorization opens in your browser — allow pop-ups and retry. In Claude Code run /mcp → Authenticate; in the Codex CLI, run codex mcp login opencapital.

It says “needs login” or stopped working

Tokens can expire — re-authorize from your client's connector settings, or remove and re-add the OpenCapital server.

Connection failed or the server is unreachable

Confirm the URL is exactly https://api.opencapital.sh/mcp, the transport is Streamable HTTP (not stdio), and your client is up to date.

Still stuck?

Email support@opencapital.sh and we'll help you get connected.

Disclosures

Informational only — not investment advice

OpenCapital provides financial data and research, not recommendations. Nothing here is an offer or personalized investment, legal, or tax advice — do your own research.

Data sources and accuracy

Derived automatically from public SEC filings and other sources; it may contain errors or delays and is provided “as is.” Verify against primary sources — see our methodology.

Read-only access

The OpenCapital MCP server is read-only — it cannot place trades, move money, or modify any account.

Third-party AI clients

Your prompts and the data returned are processed by your AI client (Claude, ChatGPT, Codex, Cursor) under its own terms. AI can be wrong — verify before acting.

Authorization

Connecting grants read access via OAuth; revoke it anytime from your client's settings. Use is governed by our Terms and Privacy Policy.