Connect to ChatGPT
Plug ChatGPT into the same data analysts use — hundreds of filings-grade metrics on every US-listed company, ten years of history. Five minutes to set up.
ChatGPT by OpenAI supports the Model Context Protocol (MCP), which lets it connect directly to OpenCapital 's stock research index. Here's how to set it up in under 5 minutes.
How to connect
Sign in to OpenCapital
Create an account or sign in. ChatGPT will use this account when authorizing the MCP connection.
Copy your connector URL
This URL lets ChatGPT connect to your OpenCapital account. Copy it — you'll paste it into ChatGPT in the next step.
https://api.opencapital.sh
/mcpAdd the server to ChatGPT
Follow the steps below to paste your MCP server URL into ChatGPT. Works the same on ChatGPT web and desktop.
Open Advanced Settings
Go to chatgpt.com, open Settings, then navigate to "Apps" in the sidebar. Click "Advanced settings" at the bottom.
Open settingsEnable Developer Mode
Toggle on "Developer mode". This allows you to add custom MCP server connections. You only need to do this once.
Create a new App
Go back to the Apps page. You'll now see a "Create app" button. Click it to set up the OpenCapital connection.
Configure the MCP connection
Name the app "OpenCapital", paste the MCP Server URL below, select "OAuth" for authentication, then click "Create".
https://api.opencapital.sh
/mcpAuthorize when prompted
The first time you ask ChatGPT about stocks via OpenCapital, it will redirect you to OpenCapital to sign in and authorize access. This uses OAuth — sign in with the same account you used in step 1, then click "Authorize". You only need to do this once.
Start asking about stocks
You're all set. To route a question through OpenCapital
, type @OpenCapital
at the start of your message — ChatGPT will call the MCP server for that question. The prompts below are pre-formatted; copy and paste straight in.
Start a new ChatGPT chat
Ask about fundamentals, segments, peer comparisons — anything an analyst would dig into.
Try these prompts
Works with ChatGPT Plus and Team
The OpenCapital MCP server works with ChatGPT Plus, Team, and Enterprise plans that have MCP support enabled. Data is read live from the OpenCapital index — ChatGPT always sees the latest fundamentals and price data.
Read-only by design
The OpenCapital MCP server only exposes read-only stock research data — fundamentals, price performance, and earnings dates derived from public SEC filings. ChatGPT cannot place trades or modify any account state.
What changes once you connect
Three real prompts — and the kind of answer ChatGPT couldn’t give you yesterday.
"How has Apple's revenue mix shifted since 2019?"
Apple’s revenue breakdown — five years apart:
Once the segments are in context, ask ChatGPT to model where Services share lands in five years, pull the operating margin behind each segment to see where Apple’s profit actually comes from, or run the same breakdown for any other ticker in the index — same chat, no spreadsheet.
"Compare hyperscaler free cash flow over the last 4 quarters"
Trailing-twelve-months free cash flow, latest four quarters:
Latest quarter and year-over-year change.
GOOGAlphabet$86B+28%
MSFTMicrosoft$85B+21%
METAMeta Platforms$65B+38%
AMZNAmazon$32B-35%With these in context, ask ChatGPT to decompose each FCF line into operating cash flow vs. capex, stress-test Amazon’s recovery under different AWS spending assumptions, or pivot the same four to buyback yield and shareholder returns — all without leaving the chat.
"Compare cloud revenue across AWS, Azure, GCP, and OCI"
Trailing-twelve-months cloud revenue, from segment disclosures:
Reported segment revenue and YoY growth, latest quarter.
AMZNAWS$108B+19%MSFTAzure$75B+30%GOOGGoogle Cloud$43B+35%
ORCLOracle Cloud Infrastructure$7B+50%From here, ask ChatGPT to project when growth rates cross, layer in segment operating margins to see who’s actually profitable on cloud, or pull capex to compare cost per dollar of cloud revenue across the four — all in the same chat, no spreadsheet required.