Access prediction market data, market positions and trading activity on Polymarket. Monitor markets, retrieve information and interact with forecasting-based financial products.
ChatGPT is OpenAI's assistant. It can add custom MCP servers as plugins, which lets it call your tools from a conversation.
This guide connects Polymarket to ChatGPT through MewCP, so ChatGPT can use Polymarket's 11 tools, like polymarket_get_markets, polymarket_get_market and polymarket_get_events, without your Polymarket credentials ever reaching the app.
Your Polymarket API key is stored encrypted and injected only at call time. Your agent never holds it, so it can never leak it, log it or paste it into a prompt.
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Other clients
Polymarket works the same way in every client below. Pick yours for its own guide.
Free to start.
Scope access to the exact Polymarket tools and accounts you allow, work and personal side by side. Anything outside that scope is refused at call time, even when the model asks for it.
Each call is logged: what ran, on which account, and whether it worked. Failures come back structured, so the agent knows whether to retry instead of guessing.
Every app sits behind one secure MCP URL, and there is no server for you to deploy or keep running. Add an integration in the dashboard and it is live on the next call, with no config to change and no new credentials to wire up. Tools load only when a task needs them, so your agent stays fast and focused however many apps you connect.
In ChatGPT, open Plugins and choose Add custom MCP.
Name it "mewcp" and paste the server URL.
Click Connect. A sign-in window opens; sign in to MewCP and approve access. No API key needed.
Start a new chat and ask: "List the tools you can use from MewCP." You should see your connected apps.
Get list of markets from Polymarket. Returns market data including question, end date, and token information. No authentication required.
Get detailed information about a specific market by ID. No authentication required.
Get list of events from Polymarket. Events contain groups of related markets. No authentication required.
Get user positions by wallet address. Returns all positions held by the user. No authentication required.
Get user trade history by wallet address. Returns all trades executed by the user. No authentication required.
Get orderbook for a specific market. Shows bids and asks with prices and sizes. No authentication required.
Get midpoint price for a specific market. The midpoint is the average of best bid and ask. No authentication required.
Create a new order on Polymarket. Requires API key authentication. Order will be placed on the CLOB.
Cancel an existing order. Requires API key authentication.
Get user's orders. Requires API key authentication. Can filter by market.
Check server readiness and basic connectivity.
