Free US market data as tools: SEC filings, insiders, short interest, 13F, COT, ETF flows, liquidity.
An MCP server that gives AI agents the XOOMAR free market data API as tools: 25 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.
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
Optional environment: XOOMAR_API_KEY (a free account key from https://xoomar.com/signup raises the limit from 30 to 120 requests a minute), XOOMAR_MAX_ROWS (rows per tool result, default 200).
| 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 |
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, 49 economies |
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".
Official MCP registry as com.xoomar/xoomar-mcp (server.json in this repository is what gets published), npm as xoomar-mcp, and on Glama. The mcpName field in package.json is the registry's proof that the npm package and the registry entry belong together.
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.
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.
Source-derived launch command. Check the maintainer’s required arguments and credentials before running:
npx -y xoomar-mcpMerge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.
{
"mcpServers": {
"com-xoomar-xoomar-mcp": {
"command": "npx",
"args": [
"-y",
"xoomar-mcp"
]
}
}
}Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.
Claude Desktop setup referenceXOOMAR market data works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.
~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.~/.cursor/mcp.jsonRestart Cursor for changes to take effect..vscode/mcp.jsonReload VS Code window for changes to take effect.~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect..mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.