Manifold MCP Server

Comprehensive MCP server for Manifold Markets providing market creation, trading, liquidity management, and social features. That is what the manifold mcp server brings to an AI assistant: the same capability, reachable through the Model Context Protocol rather than a separate app or dashboard.

The short version

An MCP server for interacting with Manifold Markets prediction markets. This server provides comprehensive access to Manifold's features through a clean MCP interface, enabling sophisticated market interactions and collective intelligence mechanisms.

The tools it exposes

The server publishes 9 tools. What each one is for:

• create_market — Create a new prediction market: typescript { outcomeType: 'BINARY' | 'MULTIPLE_CHOICE' | 'PSEUDO_NUMERIC' | 'POLL' | 'BOUNTIED_QUESTION' question
• unresolve_market — Unresolve a previously resolved market: typescript { contractId: string answerId?: string // For multiple choice markets }
• close_market — Close a market for trading: typescript { contractId: string closeTime?: number // Optional close time }
• follow_market — Follow or unfollow a market: typescript { contractId: string follow: boolean }
• react — React to markets or comments: typescript { contentId: string contentType: 'comment' | 'contract' remove?: boolean reactionType: 'like' | 'dislike' }
• place_bet — Place a bet on a market: typescript { marketId: string amount: number outcome: 'YES' | 'NO' limitProb?: number // 0.01-0.99 }
• sell_shares — Sell shares in a market: typescript { marketId: string outcome?: 'YES' | 'NO' shares?: number // Defaults to all }
• add_liquidity — Add liquidity to market pool: typescript { marketId: string amount: number }
• remove_liquidity — Remove liquidity from market pool: typescript { contractId: string amount: number }

What it needs from you

Configuration is passed through the environment: MANIFOLD_API_KEY. Treat anything key-shaped as a real credential — scope it to the minimum the server needs, and rotate it if it ever lands in a shared config.

• Node.js 18 or higher - npm or yarn - Manifold Markets API key - Minimum M$1000 balance for market creation

Getting it running

The server ships on npm as manifold-mcp-server, so your MCP client can launch it on demand — there is no separate build step. Add the server block to your client's configuration, restart it, and the tools register themselves.

How it compares

Among the developer tooling options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. Manifold's toolset — create_market, unresolve_market, close_market and 6 more — is a fair guide to whether it matches your workflow. It is maintained by bmorphism; worth a glance at recent repository activity before you build anything load-bearing on it.

This entry was verified against Manifold's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.

Things to watch

• It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
• With 9 tools registered it takes up a noticeable share of the context window; turn it off in projects that never touch Manifold.
• Missing credentials fail quietly in some clients — if no tools show up, check the environment block first.
• Keep per-call confirmation enabled while you learn its behaviour; it is the cheapest safeguard you have.