Numerical / Continuous
Binary / Categorical
Pooled / Parimutuel
Peer-to-Peer Markets
Numerical + P2P
Theoretical orderbook
Liquidity nightmare
Not viable at scale
Binary + P2P
Polymarket
Kalshi
Manifold
Binary + Pooled
Sportsbooks
Horse Racing
Traditional Parimutuel
Numerical + Pooled
TREPA
New primitive