What is River Markets?

River Markets is a specialized prime brokerage and execution platform designed for professional and institutional traders operating in prediction markets. The platform provides a unified execution stack that aggregates liquidity and market data from leading venues, including Polymarket and Kalshi. By offering a single API and a comprehensive trading terminal, River Markets enables hedge funds and proprietary trading firms to manage complex orders, monitor positions, and attribute profit and loss (P&L) seamlessly across multiple exchanges.

Built by former quantitative analysts, the platform features advanced proprietary execution algorithms such as native icebergs, pegs, and smart order routing. This infrastructure optimizes trade execution and provides significant price improvements, bridging the gap between traditional institutional finance and decentralized prediction markets without requiring clients to manage separate venue accounts or fragmented workflows.