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

| Tool | What it returns | |---|---| | short_interest | FINRA short interest with days to cover, per settlement date | | short_volume | FINRA daily short sale volume and the short share of volume, since 2021 | | fails_to_deliver | SEC fails to deliver by settlement date, since 2010 | | insider_trades | SEC Form 4 insider transactions | | insider_clusters | Companies where several insiders bought on the open market in a window | | threshold_list | Reg SHO threshold securities lists (Nasdaq and Cboe, since 2022) | | planned_insider_sales | SEC Form 144 notices of proposed sale | | large_holders | Schedule 13D and 13G holders above 5% | | fund_holders | Which tracked 13F managers hold a ticker | | fund_portfolio | One tracked manager's latest 13F portfolio | | company_financials | Quarterly and annual figures and the balance sheet from XBRL | | earnings_calendar | Reported earnings dates from 8-K Item 2.02 filings and the next expected date per company (estimated, with its basis) | | corporate_events | 8-K material events by item | | cot_positioning | CFTC Commitments of Traders, latest or one market's history | | funding_rates | Perpetual funding on Binance, Bybit, OKX, Hyperliquid, Kraken and BitMEX | | fed_liquidity | Net liquidity and its components, or one FRED series | | policy_rates | Central bank policy rates, 38 economies with a current series | | macro_series | US yield curve, spreads, stablecoin supply | | treasury_auctions | Treasury auction results and calendar since 2010 | | economic_calendar | 22 US release types from the agencies' schedules, with actuals after release | | private_placements | SEC Form D private placements | | ipo_pipeline | S-1, F-1, 424B4, EFFECT and RW filings | | bitcoin_treasuries | Bitcoin held by public companies | | federal_contracts | US federal contract actions by listed parent | | crypto_market | Open interest, liquidations, options metrics, whale positions | | api_reference | How the underlying API works |

Every result carries updatedAt, source 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 and on npm as xoomar-mcp.

Data terms

When you republish the data, credit XOOMAR with a visible link to the dataset page on xoomar.com. 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.