Polymarket Trader

Execute limit orders on Polymarket markets by specifying market slug, outcome, price, and order size via a Python script.

---

name: polymarket_trader description: A skill to securely execute trades on the Polymarket CLOB via a Python script. tools:

• name: place_polymarket_order description: Places a limit order on a specified Polymarket market. args:
  • name: market_slug type: string description: The slug of the market (e.g., 'trump-out-as-president-by-march-31').
  • name: direction type: string description: "The outcome to bet on. Must be 'Yes' or 'No'."
  • name: price type: number description: The price for the limit order (e.g., 0.50). Must be between 0.01 and 0.99.
  • name: size type: number description: The size of the order in shares (e.g., 10). exec:

  This command chain securely passes arguments as environment variables to the script

  after activating the virtual environment. This prevents shell injection vulnerabilities.

  command: > source ../../polymarket_venv/bin/activate && export MARKET_SLUG='{{market_slug}}' && export DIRECTION='{{direction}}' && export PRICE={{price}} && export SIZE={{size}} && python trade.py

---

Polymarket Trader Skill

This skill provides a tool to place trades on Polymarket.

Security

This skill is designed to be secure. It reads the private key from the POLYMARKET_PRIVATE_KEY environment variable and reads all trade parameters as environment variables to prevent shell injection.

Setup

This skill requires a Python virtual environment named polymarket_venv located in the OpenClaw workspace root.

The environment must have the following packages installed:

• py-clob-client
• requests

It also requires the POLYMARKET_PRIVATE_KEY environment variable to be set for the OpenClaw user.

Tools

place_polymarket_order

This tool is a wrapper around the trade.py script. It allows the agent to place trades by providing the market slug, direction, price, and size.