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Add free Polymarket/Kalshi matched-book dataset (Prediction Markets) #460

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Add free Polymarket/Kalshi matched-book dataset (Prediction Markets) #460

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Update README.md
coyevans13 Jul 7, 2026
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Fix doubled bullet prefix on the Matched Book entry
coyevans13 Jul 20, 2026
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Add Data language tag to Polymarket/Kalshi dataset entry
coyevans13 Aug 12, 2026
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Expand Up @@ -498,6 +498,7 @@ A curated list of insanely awesome libraries, packages and resources for Quants
- [pmxt](https://github.com/pmxt-dev/pmxt) - `Python` `JavaScript` - The CCXT for prediction markets. A unified API for trading on Polymarket, Kalshi, and more.
- [PolyMind](https://polyminds.netlify.app/) - `Python` - Real-time Polymarket trading alerts with multi-AI analysis (Groq, Claude, Gemini). Track whale bets, volume spikes, coordinated wallets, and 12 signal types. Free tier available. [GitHub](https://github.com/samirasadov28-code/PolyMind)
- [prediction-market-maker](https://github.com/octavi42/prediction-market-maker) - `Python` - Open-source market-making strategy that placed #2 in Paradigm's prediction market challenge, with full strategy evolution and analysis.
- [Polymarket × Kalshi Matched Book](https://huggingface.co/datasets/Coyevans/mlb-polymarket-kalshi-matched-book-sample) - `Data` - Free historical sample dataset: Polymarket and Kalshi orderbook prices aligned in the same window with Kalshi settled-outcome labels on every row, downloadable as Parquet/CSV with a Zenodo DOI for citation.
- [Oracle3](https://github.com/YichengYang-Ethan/oracle3) - `Python` - Autonomous trading agent for Kalshi, Polymarket, and Solana — Wang Transform pricing (calibrated on 291k resolved contracts) drives eight constraint-based arbitrage strategies and Kelly-sized model trades.

## Calendars & Market Hours
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