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About River Markets
River Markets is a prime brokerage platform built specifically for prediction markets. It provides professional traders with a unified interface to access multiple exchanges like Kalshi, Polymarket, and Polymarket US through a single API or terminal. The core value is consolidating fragmented liquidity and workflows: users can monitor positions, manage orders, and view P&L across venues in one place, while smart order routing automatically finds the best available prices. This solves the pain point of manual multi-platform trading, where professionals had to juggle separate accounts, APIs, and risk systems. In the past six months (March to September 2026), River has expanded its venue coverage, improved its execution algorithms, and grown trading volume steadily. The platform has also enhanced its order types and risk management tools, making it more attractive for systematic and high-frequency traders. No major negative events were reported during this period.
Since launching in May 2026, River Markets has become a prime brokerage for prediction markets, offering cross-venue execution, smart order routing, and consolidated risk management. In August 2026, it raised an $8.5M seed round led by Haun Ventures, with participation from Y Combinator, Coinbase Ventures, and others. The platform is live on Kalshi, Polymarket, and Polymarket US, with Novig and Crypto.com in integration. It aims to exceed hundreds of millions in annualized volume by year-end. Future focus includes expanding venue coverage, hiring engineers, enhancing trading infrastructure, and developing institutional-grade tools for larger-scale trading.
Antonin Parrot (Co-Founder & CTO): Background in engineering and CS; worked as a quant at a high-frequency options market-making firm, building trading strategies.
Oscar Levy (Co-Founder & CEO): Former quant at BlackRock, where he developed models for multi-billion-dollar portfolios; also held roles at Sandbar Asset Management and other firms.