GuessMarket MCP

MCP server forGuessMarketprediction markets. Gives AI agents full access to discover markets, analyze prices, check on-chain balances and positions, build trading transactions, and get smart contract ABIs.

1. list_markets → Find a market to trade 2. get_market → Check current odds and liquidity 3. get_balance → Check your stablecoin balance 4. get_allowance → Check if approval is needed 5. build_approve_tx → Approve stablecoin spending (if needed) 6. build_buy_shares_tx → Buy YES or NO shares 7. Sign and broadcast transactions with your wallet 8. get_position → Verify your shares

1. get_position → Check your share holdings 2. build_sell_shares_tx → Sell shares back to the market 3. Sign and broadcast the transaction 4. get_balance → Verify stablecoin received

1. build_approve_tx → Approve stablecoin spending 2. build_add_liquidity_tx → Deposit stablecoin, receive LP tokens 3. get_position → Verify LP tokens received 4. build_remove_liquidity_tx → Later: burn LP tokens to withdraw

1. build_create_market_tx → Deploy a new prediction market 2. Sign and broadcast — the new market address is in the tx receipt

{ "transaction": { "to": "0x...", "data": "0x...", "chainId": 8453, "value": "0x0" }, "description": "Buy YES shares for 10 USDC on market 0x... (Base Mainnet)", "meta": { "chain": "Base Mainnet", "stablecoin": "USDC", "outcome": "YES", "function": "buyShares(uint8,uint256,uint256)" }, "warnings": [] }

Add to yourclaude_desktop_config.json:

{ "mcpServers": { "guessmarket": { "command": "npx", "args": ["-y", "guessmarket-mcp"] } } }

claude mcp add guessmarket -- npx -y guessmarket-mcp

Or add to.mcp.jsonin your project root:

{ "mcpServers": { "guessmarket": { "command": "npx", "args": ["-y", "guessmarket-mcp"] } } }

Add to your VS Code settings or.vscode/mcp.json:

{ "mcp": { "servers": { "guessmarket": { "command": "npx", "args": ["-y", "guessmarket-mcp"] } } } }

No API keys required — the server uses the public GuessMarket REST API.

By default the server connects tohttps://guessmarket.com/api/guessmarket/v1. Override with an environment variable:

{ "mcpServers": { "guessmarket": { "command": "npx", "args": ["-y", "guessmarket-mcp"], "env": { "GUESSMARKET_API_URL": "https://your-instance.com/api/guessmarket/v1" } } } }

AI Agent <--> MCP Server <--> GuessMarket REST API (market data) | | | └───────> Public RPCs (on-chain reads) | | | 5 EVM Chains | (Ethereum, Base, Polygon, | BSC, PulseChain) | └── Signs & broadcasts unsigned transactions on-chain

The MCP server provides market data (via REST API), reads on-chain state (via public RPC endpoints), and builds unsigned transactions (via local ABI encoding). The agent signs transactions with its own wallet and broadcasts directly to the blockchain.

- Node.js 18 or later (uses nativefetch)

npm install npm run build node build/index.js

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