Claude Desktop Setup
Massive's remote MCP server runs as a connector in Claude Desktop, giving Claude live access to dividends, trades, quotes, and the rest of our market data inside any conversation. It queries our REST API under the hood, routing Claude's questions through the same data Massive serves to programmatic users.
This guide walks through adding the connector and authenticating over OAuth. There is nothing to install. Setup takes about two minutes and requires Claude Desktop plus a Massive account.
What You Can Do
After setup, you can ask Claude Desktop to:
- Pull the latest dividends declared for U.S. equities this quarter and rank them by yield.
- Compare 30-day volume and price trends for any two tickers.
- Generate a daily market brief using the top movers from the prior session.
- Find every options chain expiring this week with notable open interest near the money.
Claude routes these queries through the connector, which calls Massive's live endpoints and returns structured results Claude can summarize, chart, or hand back as raw data.
Setup
Two steps. Allow about two minutes start to finish.
1. Install Claude Desktop
If you don't have it, download Claude Desktop and confirm it launches.
2. Add the Massive Connector
In Claude Desktop, open Customize → Connectors, click Add custom connector, name it Massive, and enter the remote server URL:
Click Add, then Connect, and sign in to your Massive account when the browser prompt appears. Authentication uses OAuth, so there is no API key to copy or store. A free Basic account is enough to start.
Note: Custom connectors are available on all Claude plans (Free is limited to one connector). On Team and Enterprise, an organization owner must first add the connector under Organization settings → Connectors. Because connectors run from Anthropic's cloud rather than your machine, https://mcp.massive.com/ must be reachable on the public internet.
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 Claude Desktop 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.
Claude will issue several MCP calls in sequence and stitch the results into a single response.
Troubleshooting
Massive doesn't appear in the Connectors menu. Quit and relaunch Claude Desktop so it re-reads connectors. On Team or Enterprise, confirm an organization owner has added the connector first.
Authentication didn't complete. Re-open Settings → Connectors, select Massive, and connect again. Make sure you finished the browser sign-in and granted access.
Claude responds with numbers but doesn't cite the connector. The connector loaded but Claude chose its training data over a live call. Add "use the Massive connector" to your prompt to force a live call.
Access-denied errors. You're querying an asset class your plan doesn't include. Check your entitlements in the Dashboard.