Arbitrage tools for Kalshi and Polymarket, compared
10 public arbitrage projects side by side. Stars and update dates come from GitHub and were checked on Oct 23, 2026.
Last updated . Most common tools: Python (5), Rust (2), FastAPI (2), Kalshi API (2), JavaScript (1).
| Project | Platforms | Tools | Difficulty | GitHub stars | Repo updated |
|---|---|---|---|---|---|
| Rust Polymarket–Kalshi arbitrage engine | Kalshi & Polymarket | Rust | advanced | 445 | Dec 21, 2025 |
| Cross-venue arbitrage scanner | Kalshi & Polymarket | Python | advanced | 289 | Dec 9, 2025 |
| BTC hourly arbitrage detector | Kalshi & Polymarket | Python | advanced | 254 | May 9, 2026 |
| Polymarket–Kalshi synthetic arbitrage bot (pmxt) | Kalshi & Polymarket | JavaScript, pmxt | intermediate | 187 | Jan 16, 2026 |
| Cross-platform sports arbitrage bot | Kalshi & Polymarket | Rust | advanced | 143 | Jan 18, 2026 |
| Single and multi-market arbitrage finder | Polymarket | — | intermediate | 61 | Dec 24, 2025 |
| Arbiter: Polymarket YES+NO under $1 arbitrage scanner (paper only) | Polymarket | Python, WebSocket order books, LightGBM, Streamlit, FastAPI | advanced | 1 | Oct 20, 2026 |
| Polymarket multi-outcome bundle arbitrage scanner with paper trader | Polymarket | Python (standard library only), Polymarket Gamma and CLOB public APIs | intermediate | 0 | Oct 17, 2026 |
| Pricing Uncertainty: Kalshi mispricing and arbitrage research | Kalshi | Python, Jupyter, linear programming, Kalshi API | advanced | 0 | Oct 18, 2026 |
| ABT: Kalshi and Polymarket arbitrage review tool | Kalshi & Polymarket | Python, FastAPI, Kalshi API, Polymarket API | intermediate | 0 | Oct 20, 2026 |
How to read this
Arbitrage tools look for the same event priced differently, either across venues (for example Kalshi vs. Polymarket) or across related markets on one venue, such as outcomes that should sum to 100%. Matching contracts across venues and accounting for fees and resolution rules is the hard part.
Stars show popularity, not quality or profitability. Nothing here is financial advice. See each entry for its source, and the glossary for terms.
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