River Markets
Prime brokerage for prediction markets
River Markets is an execution and portfolio-management platform for prediction markets, providing a trading terminal and a unified API across supported venues. It addresses the need to trade multiple exchanges without separate infrastructure for each, offering advanced execution, normalized market data, and consolidated orders, positions, and P&L.
The platform includes a multi-book trading terminal with execution algorithms (Icebergs, Pegs, Take-Profit and Stop-Loss), baskets and smart routing, a unified OMS blotter, and subaccounts for isolating strategies. The unified API provides REST and WebSocket endpoints with Ed25519-signed requests, standardized contract identifiers (river_ids), and server-managed complex orders, alongside an official typed Python SDK with sync and async clients. River is live for trading and market data on Kalshi, Polymarket, Polymarket US, and Crypto.com, with Novig in integration.
River Markets is built for hedge funds, proprietary trading firms, and professional traders requiring multi-venue connectivity, API access, and consolidated portfolio visibility. It connects to customer-controlled accounts at supported exchanges rather than pooling funds. The pages describe a demo-based onboarding process without specifying plan tiers or pricing.
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