[ Polymarket × MCP ]
Your AI, fluent in Polymarket.
A free, read-only MCP server that lets Claude, ChatGPT or your own agent read a market's rules word for word, price a trade against the live order book, follow the money and size up any trader.
free · read-only · no account or keys · one URL
- Claude
- ChatGPT
- Claude Code
- Hermes
- OpenClaw
- Cursor
- any MCP client
Polymarket, last 24 h
Pulled live through the server's own tools: pm_moves · pm_flow · pm_leaderboard
[ What you can ask ]
Ask the way a trader thinks.
Paste a polymarket.com link or just name the market. Your assistant picks the tools; you get numbers, not a summary of a web page.
“Before I buy Yes on the Fed market: what actually decides it? The title isn't the rules, right?”
pm_search → pm_market
The rules come back verbatim with their named source, next to where resolution stands: not proposed, proposed and inside its challenge window, disputed, or resolved. For multi-outcome events you also see whether the prices add up to 100¢.
“If I throw $5k at the second favourite, how far does the price run on me, fees included?”
pm_book
The order is walked level by level through the live book: shares filled, average and worst price, slippage against the mid, Polymarket's taker fee from the market's own fee schedule, and the probability you need to be right to break even.
“Someone's been piling into the House market. Who is it, and who's sitting on the biggest positions?”
pm_flow
Net money per outcome (buying No counts against Yes), the largest trades with public usernames, the wallets that moved the most money in one direction, and the biggest holders. Leave the market out to see every trade of $10k or more across Polymarket.
“What blew up on Polymarket overnight? Skip the sports games.”
pm_moves → pm_flow
The 300 most-traded open markets ranked by price change over an hour, a day, a week or a month. Markets that are just settling and live games are left out, so what's left is news.
Right now, from pm_moves
- Loading live data…
“Who's printing money this week? Is the top guy actually good, or did he just get lucky?”
pm_leaderboard → pm_portfolio
Polymarket's leaderboard by profit or volume, then any wallet or username in full: all-time and 30-day P&L, rank, markets traded, open positions with entry prices, and exposure by event.
[ The tools ]
The tools. All read-only.
pm_searchEvery Polymarket market by keyword or link, grouped by event, with prices and slugs.pm_marketPrices, 1h to 30d change, fees, rules verbatim and live resolution status.pm_bookDepth near the mid and the real cost of a market order, fees included.pm_flowNet money per outcome, largest trades, top wallets and holders.pm_movesBiggest price changes, without settling markets or live games.pm_leaderboardTop traders by profit or volume, by period and category.pm_portfolioAny wallet or username: track record, positions, exposure.Public Polymarket data only. The server can't place orders, move funds or see your account.
[ Connect ]
One URL. Any AI that speaks MCP.
It's a standard remote MCP server with no sign-in, so anything that can add one by URL can use it. Pick yours.
https://mcp.lacuna.markets/mcp
- In claude.ai or Claude Desktop, open Settings → Connectors.
- Choose Add custom connector and paste the URL. There's no sign-in step.
- Ask about any market. Market, order book, trading and wallet answers render as interactive cards.
claude mcp add --transport http lacuna https://mcp.lacuna.markets/mcp
- In ChatGPT, turn on Developer mode under Settings → Apps & Connectors → Advanced.
- Choose Create, name it Lacuna, paste the URL and set authentication to No authentication.
- Enable it in a chat from the tools menu. Custom connectors need a paid ChatGPT plan.
Add it to ~/.hermes/config.yaml:
mcp_servers:
lacuna:
url: "https://mcp.lacuna.markets/mcp"
openclaw mcp add lacuna --url https://mcp.lacuna.markets/mcp --transport streamable-http
Then openclaw mcp doctor lacuna --probe to check it answers.
Cursor, VS Code, Windsurf, LM Studio and most agent frameworks take a remote server in this shape. The transport is Streamable HTTP with no authentication.
{
"mcpServers": {
"lacuna": { "url": "https://mcp.lacuna.markets/mcp" }
}
}
[ Pro, coming ]
Free stays free. Pro is for people who trade every day.
The tools stay free. We're building a paid tier on top for active traders, and the people on the early list shape it. What we're working on:
- Watch your wallet and get a plain-language note when a position moves, with the trades behind it.
- A morning brief of your markets: what changed, what resolves soon, what got proposed.
- Longer history and higher limits.
Get early access
Create an account. We'll email you once when Pro opens, and that's it.
Continue with GoogleBy signing up you agree to the privacy policy.
You're on the list.
Signed in as . We'll email you when Pro opens.
[ Questions ]
Short answers.
Is it really free?
Yes. The server is free and needs no account. Accounts are only for the coming Pro tier.
Which AI apps does it work with?
Any client that can add a remote MCP server by URL: Claude, Claude Code, ChatGPT (developer mode), Hermes, OpenClaw, Cursor and others. The interactive cards show up in clients that support MCP Apps, such as Claude; everywhere else you get the same data as text.
Can it trade for me?
No. Every tool is read-only and works on public data. It can't place orders, move funds or connect to your Polymarket account.
Where does the data come from?
Polymarket's public APIs, cached for 10 seconds to 5 minutes. Answers can lag the live site by that much.
What about Kalshi?
Not yet. Kalshi's developer terms limit API data to a member's own trading, so it isn't included.
Is this investment advice?
No. It's market data and arithmetic. What you do with it is up to you.