Xoomar MCP Server

xoomar-mcp

An MCP server that gives AI agents the XOOMAR free market data API as tools: 26 tools over 31 datasets built from primary sources (SEC EDGAR and XBRL, FINRA, CFTC, the Federal Reserve, USAspending, exchange APIs). No key needed to start.

Use it

Hosted, nothing to install: https://xoomar.com/mcp (Streamable HTTP). Add it as a remote MCP server or custom connector in Claude.ai, Claude Code (claude mcp add --transport http xoomar https://xoomar.com/mcp), ChatGPT, Cursor or any client that connects by URL. Send Authorization: Bearer <key> or X-API-Key with a free account key for 30 requests a minute; without one the limit is 10 a minute per IP. Keyless and free-key requests return up to six months of history.

Local, over stdio: Claude Desktop (claude_desktop_config.json), Claude Code, Cursor, Windsurf and any other MCP client that launches stdio servers:

{
  "mcpServers": {
    "xoomar": {
      "command": "npx",
      "args": ["-y", "xoomar-mcp"]
    }
  }
}

Claude Code, one line:

claude mcp add xoomar -- npx -y xoomar-mcp

As a library (the hosted endpoint is built this way):

import { buildServer } from "xoomar-mcp";
const server = buildServer({ apiKey: "xm_live_...", maxRows: 100 }); // an McpServer with the 26 tools; connect any transport

Optional environment for the stdio bin: XOOMAR_API_KEY (a free account key from https://xoomar.com/signup raises the limit from 10 to 30 requests a minute; keyless and free-key requests return up to six months of history), XOOMAR_MAX_ROWS (rows per tool result, default 200).

Tools

Every result carries updatedAt, source (who publishes the data: FINRA, the SEC, the CFTC, the exchange), sourceAttribution (the credit line to show with it) and the attribution line. Ask things like "How has GME short interest moved this year?", "Which tracked funds bought NVDA last quarter?", "What is Fed net liquidity doing?", "Show open-market insider purchases in the last 7 days".

Where it is listed

Listed in the official MCP registry as com.xoomar/xoomar-mcp, on npm as xoomar-mcp, and on mcpservers.org.

Data terms

When you republish the data, credit XOOMAR with a visible link to the dataset page on xoomar.com, together with the result's sourceAttribution line. What you may do with the data is set out at https://xoomar.com/terms.

Development

npm install
npm test        # builds, then talks to the server over stdio (one test hits the live API)

Apache-2.0 for this code, XOOMAR. The license covers the code only, not the data.