📊 Polymarket MCP Server

📖 Overview

The Polymarket MCP Server enables AI agents to interact with Polymarket, a leading prediction market platform on Polygon. This server provides comprehensive access to market data, real-time pricing, order books, and trading capabilities through the Polymarket API.

By implementing the Model Context Protocol (MCP), this server allows Large Language Models (LLMs) to discover prediction markets, analyze odds (probabilities), execute trades, and track portfolio positions directly through their context window, bridging the gap between AI and decentralized prediction markets.

✨ Features

• Market Discovery: Search and filter prediction markets by keywords, tags, and status.
• Real-time Pricing: Access live price data, implied probabilities, and depth-of-market (order books) for any outcome token.
• Trading Capabilities: Place limit orders, market orders, and manage open orders (requires private key).
• Portfolio Tracking: Monitor user positions, trade history, and balances for specific wallet addresses.
• Order Management: View, cancel, and manage open orders across all markets.

📦 Installation

🚀 Using npx (Recommended)

To use this server without installing it globally:

npx @iqai/mcp-polymarket

🔧 Build from Source

git clone https://github.com/IQAIcom/mcp-polymarket.git
cd mcp-polymarket
pnpm install
pnpm run build

⚡ Running with an MCP Client

Add the following configuration to your MCP client settings (e.g., claude_desktop_config.json).

📋 Minimal Configuration (Read-Only)

{
  "mcpServers": {
    "polymarket": {
      "command": "npx",
      "args": ["-y", "@iqai/mcp-polymarket"]
    }
  }
}

⚙️ Advanced Configuration (With Trading)

{
  "mcpServers": {
    "polymarket": {
      "command": "npx",
      "args": ["-y", "@iqai/mcp-polymarket"],
      "env": {
        "POLYMARKET_PRIVATE_KEY": "your_private_key_here",
        "POLYGON_RPC_URL": "https://polygon-mainnet.g.alchemy.com/v2/<YOUR_KEY>"
      }
    }
  }
}

🔐 Configuration (Environment Variables)

Variable	Required	Description	Default
POLYMARKET_PRIVATE_KEY	No	Private key for trading (enables trading tools)	-
POLYGON_RPC_URL	No	Polygon RPC URL for transactions	https://polygon-rpc.com
CLOB_API_BASE	No	Polymarket CLOB API base URL	https://clob.polymarket.com
CHAIN_ID	No	Blockchain network chain ID	137 (Polygon)
SIGNATURE_TYPE	No	Signature type for signing transactions	2
POLYMARKET_FUNDER	No	Funder address for transactions	-
FUNDER_ADDRESS	No	Alternative funder address (alias)	-

💡 Usage Examples

🔍 Market Discovery

• "What are the most active prediction markets on Polymarket right now?"
• "Search for markets related to 'Bitcoin' or 'BTC'."
• "Find markets in the 'Crypto' category."
• "What events are trending on Polymarket today?"

📊 Analytics & Pricing

• "Show me the order book for the 2024 election market."
• "What is the current probability implied by the price of the 'Yes' token?"
• "Get detailed information about the 'will-trump-win-2024' market."

💼 Portfolio & Trading (Requires Private Key)

• "What's my current USDC balance and allowance?"
• "Show me all my open orders across all markets."
• "Place a buy order for 100 shares at 0.65 price."
• "Cancel all my open orders on this market."

🛠️ MCP Tools

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approve_allowances

Grant the USDC and Conditional Tokens approvals required to trade on Polymarket. Automatically approves only the contracts that don't already have approvals set. Includes both regular and NegRisk markets. These approvals are standard ERC20/ERC1155 approvals, revocable at any time in your wallet.

Parameter	Type	Required	Description
waitForConfirmations	integer	false	How many confirmations to wait before returning (0 = return immediately after broadcasting). Default: 0

cancel_all_orders

Cancel all open orders for the authenticated account.

No parameters

cancel_order

Cancel a specific order by its ID.

Parameter	Type	Required	Description
orderId	string	true	The unique identifier of the order to cancel

get_all_tags

Get a list of all available tags for categorizing markets.

No parameters

get_balance_allowance

Get balance and allowance information for the authenticated account. Can check COLLATERAL or CONDITIONAL tokens.

Parameter	Type	Required	Description
assetType	string	true	Asset type to check balance for: COLLATERAL or CONDITIONAL
tokenID	string	false	Optional token ID for conditional token balance

get_event_by_slug

Get detailed information about a specific event by its slug identifier. Events group multiple related markets.

Parameter	Type	Required	Description
slug	string	true	The event slug identifier

get_market_by_slug

Get detailed information about a specific market by its slug identifier. The slug can be extracted from the Polymarket URL.

Parameter	Type	Required	Description
slug	string	true	The market slug identifier (e.g., 'will-trump-win-2024')

get_markets_by_tag

Get markets filtered by a specific tag ID. Useful for finding markets in specific categories.

Parameter	Type	Required	Default	Description
tag_id	string	true		The tag ID to filter by
limit	number	false	20	Number of markets to return (default: 20)
closed	boolean	false	false	Include closed markets (default: false)

get_open_orders

Get all open orders for the authenticated account. Can optionally filter by market.

Parameter	Type	Required	Description
market	string	false	Optional market address to filter orders by

get_order

Get details of a specific order by its ID.

Parameter	Type	Required	Description
orderId	string	true	The unique identifier of the order

get_order_book

Get the current order book for a specific market token. Shows all active buy and sell orders.

Parameter	Type	Required	Description
token_id	string	true	The token ID for the market outcome

get_positions

Get all positions for a wallet address with current values. Returns position details including size, current price, current value, and P&L. Uses the Polymarket Data API for accurate position valuation.

Parameter	Type	Required	Default	Description
user	string	false		Wallet address to fetch positions for. If not provided, uses POLYMARKET_FUNDER env var.
limit	number	false	100	Maximum number of positions to return (default: 100)

get_trade_history

Get trade history for the authenticated account. Can optionally filter by market or maker address.

Parameter	Type	Required	Description
market	string	false	Optional market address to filter trades by
maker_address	string	false	Optional maker address to filter trades by

list_active_markets

List all currently active markets with pagination. Returns markets that are not yet closed.

Parameter	Type	Required	Default	Description
limit	number	false	20	Number of markets to return (default: 20, max: 100)
offset	number	false	0	Number of markets to skip for pagination (default: 0)

place_market_order

Place a market order that executes immediately at current market price. IMPORTANT: For BUY orders, amount is the dollar amount ($USD) you want to spend. For SELL orders, amount is the number of shares to sell. Example: amount=5, side=BUY means 'spend $5 to buy shares at market price'. Minimum $1 for BUY orders.

Parameter	Type	Required	Description
tokenId	string	true	The token ID of the market outcome to trade
amount	number	true	BUY orders: Dollar amount ($) to spend. SELL orders: Number of shares to sell. Minimum $1 for BUY orders.
side	string	true	The side of the order: BUY or SELL
orderType	string	false	Order type: FOK (Fill or Kill) or FAK (Fill and Kill). Default: FOK

place_order

Place a limit order on Polymarket at a specific price. Specify the number of shares (size) and price (0-1). For both BUY and SELL, you specify the number of shares you want to trade. Example: size=10, price=0.6 means buy/sell 10 shares at $0.60 per share (total: $6).

Parameter	Type	Required	Description
tokenId	string	true	The token ID of the market outcome to trade
price	number	true	The limit price for the order (between 0 and 1). This is the probability/price per share.
size	number	true	Number of shares to trade. For both BUY and SELL orders, this is always the number of outcome tokens/shares.
side	string	true	The side of the order: BUY or SELL
orderType	string	false	Order type: GTC (Good Till Cancelled) or GTD (Good Till Date). Default: GTC

redeem_positions

Redeem (claim) winnings from a resolved Polymarket prediction market. Use this to collect USDC from positions in markets that have been settled. For regular markets, you need the conditionId. For negative risk markets, you also need the tokenId and should set negRisk=true. The market must be resolved before redemption is possible.

Parameter	Type	Required	Default	Description
conditionId	string	true		The condition ID (market ID) for the resolved market. This is typically a 32-byte hex string.
tokenId	string	false		The token ID of the position to redeem. Required for negRisk markets, optional for regular markets.
outcomeIndex	number	false		The outcome index: 0 for Yes/first outcome, 1 for No/second outcome. Used for negRisk markets to determine which tokens to redeem.
negRisk	boolean	false	false	Whether this is a negative risk market. Negative risk markets use the NegRiskAdapter contract for redemption. Default: false

search_markets

Search for markets, events, and profiles using text search.

Parameter	Type	Required	Description
query	string	true	Search query text

update_balance_allowance

Update balance and allowance for the authenticated account. Required before trading.

Parameter	Type	Required	Description
assetType	string	true	Asset type to update allowance for: COLLATERAL or CONDITIONAL
tokenID	string	false	Optional token ID for conditional token

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👨‍💻 Development

🏗️ Build Project

pnpm run build

👁️ Development Mode (Watch)

pnpm run watch

✅ Linting & Formatting

pnpm run lint
pnpm run format

📁 Project Structure

• src/tools/: Individual tool definitions
• src/services/: API client and business logic
• src/index.ts: Server entry point

📚 Resources

• Polymarket API Documentation
• Model Context Protocol (MCP)
• Polymarket Platform

⚠️ Disclaimer

This project is an unofficial tool and is not directly affiliated with Polymarket. It interacts with financial and prediction market data. Users should exercise caution and verify all data independently. Trading in prediction markets involves risk.

📄 License

MIT