RI

River Markets

YC X26

San Francisco, US · Founded 2026 · 2 employees · 1 known investors

rivermarkets.com ↗

River Markets provides a unified trading terminal and API for prediction market desks, aggregating order books and execution across multiple prediction exchanges like Kalshi and Polymarket.

Founders & leadership· Y Combinator alumni (X26)

Oscar LevyinCo-Founder

Antonin Parrotin𝕏Founder

Investors · 1

Y

Y CombinatorMountain View · $500K – $500K