# Polymarket Paper Trader (MCP server)

> Polymarket Paper Trader is an MCP server that adds finance tools to AI assistants such as Claude Desktop, Claude Code and Cursor. Polymarket paper trading for AI agents: $10k paper money, real order books, official fees. It has 454 GitHub stars, is released under the MIT license and runs locally with uvx polymarket-paper-trader.

A zero-risk gym for AI agents on real prediction markets — real order books, official fees, verified fill fidelity. Practice, evaluate, and benchmark decision intelligence.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/agent-next/polymarket-paper-trader |
| GitHub stars | 454 |
| License | MIT |
| Language | Python |
| Transport | stdio |
| Packages | pypi: polymarket-paper-trader |
| Remote URL | none |
| Needs API key | no |
| Official | no |
| Works with | Claude Desktop, Claude Code, Cursor, VS Code |
| Category | Finance |
| Latest release | v0.4.5 (Oct 1, 2026) |
| Last commit | Oct 1, 2026 |
| MCP registry name | io.github.agent-next/polymarket-paper-trader |

## Install

### Claude Desktop (claude_desktop_config.json)

```json
{
  "mcpServers": {
    "polymarket-paper-trader": {
      "command": "uvx",
      "args": [
        "polymarket-paper-trader"
      ]
    }
  }
}
```

Settings > Developer > Edit Config. macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\. Restart Claude Desktop afterwards.

### Claude Code

```sh
claude mcp add --transport stdio polymarket-paper-trader -- uvx polymarket-paper-trader
```

### Cursor (.cursor/mcp.json)

```json
{
  "mcpServers": {
    "polymarket-paper-trader": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "polymarket-paper-trader"
      ]
    }
  }
}
```

Project file; use ~/.cursor/mcp.json to enable it in every project.

### VS Code (.vscode/mcp.json)

```json
{
  "servers": {
    "polymarket-paper-trader": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "polymarket-paper-trader"
      ]
    }
  }
}
```

Config formats checked against the official docs on 2026-10-07.

## Tools

- `init_account`: Create paper account with starting balance
- `get_balance`: Cash, reserved/available cash, positions value, total P&L
- `reset_account`: Wipe all data and start fresh
- `search_markets`: Find markets by keyword
- `list_markets`: Browse markets sorted by volume/liquidity
- `get_tags`: All market categories/tags for filtering
- `get_markets_by_tag`: Markets in a specific category/tag
- `get_event`: Event details — a group of related markets
- `get_market`: Market details with outcomes and prices
- `get_order_book`: Live order book snapshot (bids + asks)
- `watch_prices`: Monitor prices for multiple markets
- `sell`: Sell shares at best available prices
- `portfolio`: Open positions with live valuations and P&L
- `history`: Recent trade log with execution details
- `place_limit_order`: Limit order — stays open until filled or cancelled/expired
- `list_orders`: Pending limit orders
- `cancel_order`: Cancel a pending order
- `cancel_all_orders`: Cancel all pending limit orders at once
- `check_orders`: Execute pending orders against live prices
- `stats`: Win rate, ROI, profit, max drawdown
- `resolve`: Resolve a closed market (winners get $1/share)
- `resolve_all`: Resolve all closed markets
- `backtest`: Backtest a strategy against historical snapshots (stdio only)
- `stats_card`: Shareable stats card (tweet/markdown/plain)
- `share_content`: Platform-specific content (twitter/telegram/discord)
- `leaderboard_entry`: Generate verifiable leaderboard submission
- `leaderboard_card`: Top 10 ranking card from all local accounts
- `pk_card`: Head-to-head comparison between two accounts
- `pk_battle`: Run two strategies head-to-head, auto-compare (stdio only)

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