6 Best ML Libraries Top Quant Traders Use to Exploit Model Bias on Polymarket (Full Quant Stack)
Most bots on Polymarket still operate as simple reactive systems - they treat public forecasts as the ultimate truth
Top quant traders have moved far beyond that. Instead of relying on public models and third-party forecasts, they build meta-models that actively hunt for and exploit the systematic biases and weaknesses in those forecasts
Here’s the actual list of libraries that top quants are using right now:
1. LightGBM - The Go-To Workhorse
• Extremely fast gradient boosting with leaf-wise tree growth
• Handles hundreds of features effortlessly (raw forecasts historical bias corrections sentiment volume)
• Repo:
github.com/microsoft/LightGB…
2. XGBoost - The Reliable Veteran
• Classic gradient boosting with strong regularization
• Excellent GPU support and best-in-class SHAP explainability
• Repo:
github.com/dmlc/xgboost
3. HistGradientBoosting (scikit-learn)
• Powerful histogram-based boosting built directly into sklearn
• Best choice for fast prototyping and experimentation
• Repo:
github.com/scikit-learn/scik…
4. RandomForest (also sklearn)
• Solid baseline to quickly check if your features actually have signal
• Repo:
github.com/scikit-learn/scik…
5. TabNet
• Neural network architecture designed specifically for tabular data
• Great at combining text embeddings (news/tweets) with numerical features
• Repo:
github.com/dreamquark-ai/tab…
6. River
• Best library for online/incremental learning
• The model learns and adapts in real time - essential for fast-moving events
• Repo:
github.com/online-ml/river
Recommended 2026 Stack: LightGBM (main model) XGBoost (stacking) River (online adaptation)
All of these libraries work great with SHAP - so you don’t just get a probability, you actually see which model bias you’re currently profiting from
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