Prediction Market Trader — Kalshi Trading Toolkit

Trade prediction markets with edge. Scan markets, calculate true probabilities, size positions, execute orders.

Pipeline

1. Scan — Pull open markets from Kalshi API by category (sports, weather, politics, economics)
2. De-vig — Get bookmaker odds from Sofascore, remove vig to find true probabilities
3. Compare — Find gaps between Kalshi price and true probability (minimum 4% edge)
4. Size — Quarter-Kelly criterion for position sizing (max 15% of bankroll per trade)
5. Execute — Place limit orders via Kalshi API with RSA-PSS authentication
6. Monitor — Track positions, P&L, and exit on profit targets

Requirements

• Kalshi API credentials — KALSHI_KEY_ID and KALSHI_PRIVATE_KEY (RSA private key, inline or .pem)
• Node.js 18+ — for crypto.sign with RSA-PSS

Quick Start