ChatGPT Setup
Massive's remote MCP server connects to ChatGPT as a custom connector, giving ChatGPT live access to dividends, quotes, trades, options chains, and the rest of our catalog. It queries our REST API under the hood, with all calls hitting the same live API used by programmatic integrations.
This guide walks through adding the connector and authenticating over OAuth. There is nothing to install. Setup takes about two minutes and requires a ChatGPT plan that supports connectors plus a Massive account.
What You Can Do
After setup, you can ask ChatGPT to:
- Pull the prior session's top gainers and losers and summarize what drove them.
- Compare dividend yields across a sector and rank by payout reliability.
- Draft a morning market brief using Massive's live snapshot data.
- Check options open interest near the money for any ticker before earnings.
ChatGPT handles the conversational framing. Massive handles the data. The combination is strongest for exploratory, conversational queries where you want structured market data in plain English rather than code.
Setup
Three steps. Allow about three minutes start to finish.
1. Use a Supported Plan
Custom MCP connectors require a paid ChatGPT plan (Plus, Pro, Business, Enterprise, or Edu). Free is not supported. Log in to chatgpt.com.
2. Enable Developer Mode
Adding a custom MCP server requires Developer mode (currently a beta feature). Open Settings → Apps & Connectors → Advanced settings and toggle on Developer mode.
3. Add the Massive Connector
In Settings → Apps & Connectors, click Create, give the connector a name (for example, "Massive"), and enter the remote server URL:
Set Authentication to OAuth, confirm you trust the application, and click Create. Complete the sign-in to your Massive account when redirected. There is no API key to copy or store. A free Basic account is enough to start.
Note: Developer mode and custom MCP connectors are a beta feature, and an organization admin can turn them off. Menu labels ("Apps & Connectors," formerly "Connectors") change often, so if you can't find them, check ChatGPT's current connector documentation.
Your MCP access mirrors your Massive entitlements. You can query any asset class your plan includes. If you have Stocks access, stocks data is available through MCP. Requesting data you are not entitled to (for example, Options without an Options plan) returns an access-denied error.
Test the Integration
Now that the connection is live, put it through its paces. A few prompts to start with:
- "Show me the latest trade for AAPL." (Trades)
- "Is the U.S. market open right now?" (Market Status)
- "When is the next market holiday?" (Market Holidays)
- "What dividends has AAPL paid this year?" (Dividends)
- "Give me a snapshot of today's biggest gainers." (Snapshots)
When you're ready to go deeper, hand ChatGPT a full brief and let it chain several calls together:
Pull all dividends declared in the last 30 days, filter to U.S. equities with a market cap over $50 billion, rank them by yield, and summarize the top five with their pay dates.
ChatGPT will issue several connector calls and stitch the results into a single ranked answer.
Troubleshooting
Massive isn't available in the chat. Confirm Developer mode is enabled (Settings → Apps & Connectors → Advanced settings) and that you selected Massive via + → More → Developer mode in the chat.
Authentication didn't complete. Re-open Settings → Apps & Connectors, reconnect Massive, and finish the OAuth sign-in.
ChatGPT responds with made-up numbers. The connector wasn't invoked. Start your message with "use the Massive connector to" and name the data you want.
Access-denied errors. You're querying an asset class your plan doesn't include. Check your entitlements in the Dashboard.