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graph-polymarket-mcp

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MCP server for querying Polymarket prediction market data via The Graph subgraphs and Polymarket REST APIs.

Exposes 31 tools that AI agents (Claude, Cursor, etc.) can use to search markets, get real-time CLOB prices and order books, query on-chain data, trader P&L, positions, activity, open interest, market resolution status, and trader profiles.

v2.0.0 — adds 10 new tools powered by Polymarket's Gamma and CLOB APIs (inspired by polymarket-cli): market search, event browsing, live prices, spreads, order books, price history, and more. No API key needed for these tools — they hit Polymarket's public REST endpoints directly.

Published to the MCP Registry as io.github.PaulieB14/graph-polymarket-mcp

Prerequisites

You need a free Graph API key (takes ~2 minutes):

  1. Go to The Graph Studio
  2. Connect your wallet (MetaMask, WalletConnect, etc.)
  3. Click "API Keys" in the sidebar and create one
  4. Free tier includes 100,000 queries/month

Installation

npm install -g graph-polymarket-mcp

Or use directly with npx:

npx graph-polymarket-mcp

Configuration

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "graph-polymarket": {
      "command": "npx",
      "args": ["-y", "graph-polymarket-mcp"],
      "env": {
        "GRAPH_API_KEY": "your-api-key-here"
      }
    }
  }
}

Claude Code

claude mcp add graph-polymarket -- npx -y graph-polymarket-mcp

Set the environment variable GRAPH_API_KEY before running.

Cursor / Other MCP Clients

Use the stdio transport with npx graph-polymarket-mcp as the command, passing GRAPH_API_KEY as an environment variable.

OpenClaw / Remote Agents (SSE)

The SSE transport has no authentication. Anyone who can reach the port can call every tool, and those calls spend your GRAPH_API_KEY quota. --http binds 0.0.0.0 inside a container, so publish it to 127.0.0.1 on the host and put a reverse proxy with TLS and auth in front of anything reachable off-box. For local agents, prefer the default stdio transport — it has no network surface at all.

Start the server with the HTTP transport:

# Dual transport — stdio + SSE on port 3851
GRAPH_API_KEY=your-key npx graph-polymarket-mcp --http

# SSE only (for remote/server deployments)
GRAPH_API_KEY=your-key npx graph-polymarket-mcp --http-only

# Custom port
MCP_HTTP_PORT=4000 GRAPH_API_KEY=your-key npx graph-polymarket-mcp --http

Then point your agent at the SSE endpoint:

{
  "mcpServers": {
    "graph-polymarket": {
      "url": "http://localhost:3851/sse"
    }
  }
}

Transport Modes

Invocation Transports Use case
npx graph-polymarket-mcp stdio Claude Desktop, Cursor, Claude Code
npx graph-polymarket-mcp --http stdio + SSE :3851 Dual — local + remote agents
npx graph-polymarket-mcp --http-only SSE :3851 OpenClaw, remote deployments

A /health endpoint is available at http://localhost:3851/health when HTTP transport is active.

Available Tools

Core Tools

Tool Description
list_subgraphs List all available Polymarket subgraphs with descriptions and key entities
get_subgraph_schema Get the full GraphQL schema for a specific subgraph
query_subgraph Execute a custom GraphQL query against any subgraph

Domain-Specific Tools

Tool Description Subgraphs
get_market_data Get market/condition data with outcomes and resolution status Main
get_global_stats Get platform stats: market counts + real volume/fees/trades Main + Orderbook
get_account_pnl Get a trader's P&L and performance metrics (winRate, profitFactor, maxDrawdown) Beefy P&L
get_top_traders Leaderboard ranked by PnL, winRate, volume, or profitFactor. Cross-refs Orderbook to flag rows where OB volume exceeds Beefy-tracked volume and surface OB-only traders absent from the leaderboard. Beefy P&L + Orderbook
get_daily_stats Daily volume, fees, trader counts, and market activity (1–90 days) Beefy P&L
get_market_positions Top holders for a specific outcome token with their P&L Beefy P&L
get_user_positions Current token positions. Cross-refs Orderbook: flags ⚠ orderbook-only entry when totalBought=0 but OB volume exists, and ⚠ mixed entry when OB volume > 2× split collateral. Slimmed P&L + Orderbook
get_recent_activity Unified chronological feed interleaving splits, merges, and redemptions with orderbook fills. Supports optional address filter. Activity + Orderbook
get_orderbook_trades Get recent order fills with maker/taker filtering Orderbook
get_market_open_interest Top markets ranked by USDC locked in outstanding positions. Cross-refs Main subgraph to flag ⚠ dead money OI on resolved markets (losing-side tokens that will never be redeemed on-chain). Open Interest + Main
get_oi_history Hourly OI snapshots for a specific market (for charting trends) Open Interest
get_global_open_interest Total platform-wide open interest and market count Open Interest
get_market_resolution UMA oracle resolution status with filtering by status Resolution
get_disputed_markets Markets disputed during oracle resolution (high-signal events) Resolution
get_market_revisions Moderator interventions and updates on market resolution Resolution
get_trader_profile Full trader profile combining CTF events and USDC flows with Orderbook fills. Classifies wallet as hybrid / orderbook-only / split-collateral-only and warns when P&L subgraphs are unreliable. Traders + Orderbook
get_trader_usdc_flows USDC deposit/withdrawal history with direction filtering Traders

Polymarket REST API Tools (no Graph API key needed)

Tool Description API
search_markets Search markets by text query with filters (active, closed, sort by volume/liquidity) Gamma
get_market_info Get detailed market metadata by slug or condition ID Gamma
list_polymarket_events Browse events (groups of related markets) with tag/status filters Gamma
get_polymarket_event Get a single event with all its associated markets Gamma
get_live_prices Real-time CLOB prices for outcome tokens (buy/sell, single or batch) CLOB
get_live_spread Bid-ask spread + midpoint for assessing market liquidity CLOB
get_live_orderbook Full order book (all resting bids and asks) for a token CLOB
get_price_history Historical price time-series (1m to max interval, configurable fidelity) CLOB
get_last_trade Last trade price for an outcome token CLOB
get_clob_market CLOB market details: token IDs, live prices, min order/tick sizes CLOB
search_markets_enriched Power tool: search + auto-enrich with live CLOB prices AND on-chain resolution status in one call Gamma + CLOB + Graph

CLOB V2 Tools

Polymarket migrated to V2 exchange contracts on 2026-04-28. These tools read the V2 subgraphs, which index from block 84902353 and hold no pre-migration history — V1 and V2 are different eras, not old and new.

Tool Description Subgraphs
get_builder_leaderboard Rank V2 builders by routed volume, order count or fees, with each builder's share of V2 volume. No V1 equivalent — the V1 contracts never emitted a builder code V2 Orderbook
get_builder_activity Recent fills routed by one builder code, plus that builder's aggregate totals V2 Orderbook
get_v2_top_traders Top real V2 traders, with the exchange contracts filtered out V2 Orderbook
check_subgraph_freshness How far behind chainhead any subgraph is, read live from its _meta block Any

Builder attribution is the capability V2 adds. Every V2 fill carries the builder code of the frontend, bot or integrator that routed it, so "who is actually routing this flow" becomes an answerable question — 3,325 builders as of 2026-08-08.

Two traps these tools handle for you. The V2 exchange contracts appear as Account rows, because the exchange is the taker when an order matches the book — ranking accounts naively returns 0xe111…996b (176M fills) and 0xe222…0f59 (41M fills) above every human. get_v2_top_traders excludes them. And v2_main is still syncing, so it answers with stale data rather than erroring; check_subgraph_freshness tells you how stale before you trust a number.

Data Sources

The Graph Subgraphs (requires GRAPH_API_KEY)

On-chain indexed data — authoritative for historical analytics, P&L, open interest, and resolution status.

Subgraphs

Name IPFS Hash Description
Main QmdyCguLEisTtQFveEkvMhTH7UzjyhnrF9kpvhYeG4QX8a Complete ecosystem data
Beefy P&L QmbHwcGkumWdyTK2jYWXV3vX4WyinftEGbuwi7hDkhPWqG Comprehensive P&L tracking
Slimmed P&L QmZAYiMeZiWC7ZjdWepek7hy1jbcW3ngimBF9ibTiTtwQU Minimal position data
Activity Qmf3qPUsfQ8et6E3QNBmuXXKqUJi91mo5zbsaTkQrSnMAP Position management events
Orderbook QmVGA9vvNZtEquVzDpw8wnTFDxVjB6mavTRMTrKuUBhi4t Order fill analytics
Open Interest QmbT2MmS2VGbGihiTUmWk6GMc2QYqoT9ZhiupUicYMWt6H Per-market and global OI with hourly snapshots
Resolution QmZnnrHWCB1Mb8dxxXDxfComjNdaGyRC66W8derjn3XDPg UMA oracle resolution lifecycle
Traders QmfT4YQwFfAi77hrC2JH3JiPF7C4nEn27UQRGNpSpUupqn Per-trader event logs and USDC flows

CLOB V2 (from block 84902353 — no earlier history)

Name IPFS Hash Status Description
V2 Orderbook QmNtJGxpAjFgoHhMwdijyvbLrpPPiHHX2qct56nTpk42Bs at chainhead V2 fills with builder-code attribution
V2 P&L QmT21E4p8r6FCzW2EPK4NVj1dbcggdvKxZr8uuMcB4P5Cu at chainhead Cost basis and realized P&L from V2 fills only
V2 Main QmTKrqyYg23BjhihmsrRjbV9cVS2piNmnHsr7cjYaTgdWu ⚠️ syncing Conditions and counters — ~86 days behind as of 2026-08-08

Open Interest (above) is already a V2 deployment; it reads ConditionalTokens, which V2 left unchanged, so it has no migration discontinuity.

Which era to ask: all-time or pre-2026-04-28 → V1. Post-migration activity, or anything about builders → V2. beefy_pnl keeps the hedge-fund metrics (winRate, profitFactor, maxDrawdown, daily series) that V2 P&L does not have, so trader-quality scoring stays on V1.

Example Queries

Once connected, an AI agent can:

Market Discovery (Gamma API)

  • "Search for prediction markets about AI"
  • "Show me the most active Polymarket events right now"
  • "Find markets about the 2024 election sorted by volume"
  • "What markets are in the 'crypto' category?"

Live Trading Data (CLOB API)

  • "What's the current price for the Trump YES token?"
  • "Show me the full order book for this market"
  • "What's the bid-ask spread on this token?"
  • "Show me the price history for this market over the last week"

On-Chain Analytics (The Graph)

  • "What are the current Polymarket global stats?"
  • "Show me the latest 20 orderbook trades"
  • "What are the positions for address 0x...?" (flags if wallet entered via OB buys only)
  • "Get the P&L for trader 0x...?"
  • "Which markets have the most open interest right now?" (flags dead-money OI on resolved markets)
  • "Show me disputed markets on Polymarket"
  • "Who are the top traders?" (flags any with OB volume not captured by Beefy P&L)
  • "Show me the full trading history for wallet 0x..." (includes OB fills + entry type classification)

Development

git clone https://github.com/PaulieB14/graph-polymarket-mcp.git
cd graph-polymarket-mcp
npm install
npm run build
GRAPH_API_KEY=your-key node build/index.js

License

MIT

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MCP server for Polymarket prediction markets — 31 tools combining The Graph subgraphs + Polymarket REST APIs (Gamma + CLOB) for market search, live prices, order books, trader P&L, open interest, and resolution data

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