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River Markets
Founders
River Markets is a YC P26-backed prime brokerage built exclusively for prediction markets. The platform provides a single terminal and API to trade across every major venue, including Kalshi and Polymarket, with best-price routing, cross-exchange margin, and professional-grade execution algorithms. It solves a critical infrastructure gap: traders previously had to stitch together fragmented venue APIs, split collateral across exchanges, and suffer edge loss on every fill. River Markets unifies data, execution, and portfolio management into one professional-grade platform, enabling onboarding of a new exchange in minutes rather than months.
Company Founded in
Fintech