Trade prediction markets
on margin

Leverage your capital, execute at scale, and manage risk across every major exchange, all from a single account.

$50M+

Volume Traded

on platform

Price Improvement

vs. direct exchange

3,000+

Markets

across exchanges

Web App REST & WebSocket API OTC Desk

Backed by

ACCESS LEVERAGE

Leverage your exposure.
Trade bigger with less capital.

Other platforms require 100% collateral. River gives you margin, so you can deploy capital efficiently.

Up to 5x Leverage

Put up a fraction of the notional. Control significantly larger positions than your cash balance.

Portfolio Margining

Cross-margin positions for lower capital requirements. Our risk engine recognizes hedges and offsets across your entire book in real time.

Capital Efficiency

Free up capital for diversification. Run more strategies simultaneously without tying up your entire book.

Capital

$100K

Trading Power

$500K

Best Execution

Aggregated order book.
Best price, every trade.

River merges order books from Kalshi, Polymarket, and all connected exchanges into a single view. Your order routes to whichever exchange has the best price and liquidity. Automatically.

Cross-Exchange Routing

One order, best fill. We scan every connected exchange and route to the tightest price.

2% Price Improvement

On average, our aggregated execution beats single-exchange fills by 2%.

Aggregated Book 0 Fed Rate Cuts 2026 · YES

KAL 0.39 84,200 $181,654

POLY 0.38 125,600 $148,816

KAL 0.37 68,400 $101,088

POLY 0.36 210,500 $75,780

Mid: 0.355

POLY 0.35 185,300 $64,855

KAL 0.34 92,100 $96,169

POLY 0.33 148,600 $145,207

KAL 0.32 76,400 $169,655

Platform

Built for traders

Everything a professional trading operation needs, built for this asset class from the ground up.

Execution Algorithms

TWAP, VWAP, and smart execution strategies that minimize slippage on large orders across fragmented liquidity.

Smart Order Routing

Automatically find the best price across Polymarket, Kalshi, and other exchanges. One order, best execution.

Leverage

Trade on margin with up to 5x buying power. Deploy capital efficiently and scale your strategies without locking up your entire balance.

Data & APIs

REST and WebSocket APIs for real-time market data, order management, and portfolio monitoring.

Portfolio Management

Unified view of positions across exchanges. Real-time P&L and risk metrics for your entire book.

OTC Trading

Execute large blocks off-exchange with zero market impact. White-glove service for sizable positions.

Developer-First

Trade programmatically
via API

Build on top of River. Search markets, place orders, and manage positions programmatically across every exchange. .

REST & WebSocket APIs

Real-time market data streaming

Margin & position management

Comparison

Why River Markets

Market access ✕ One exchange at a time ✓ All exchanges, one account

Price ✕ Single-exchange price ✓ Avg. 2% better

Leverage ✕ Full collateral required ✓ Cross-exchange margin

Capital ✕ Fragmented across platforms ✓ Unified

Execution ✕ Manual ✓ Algorithmic routing

Integration ✕ Separate account per exchange ✓ One API, one dashboard

Trade prediction marketson margin

Leverage your exposure.Trade bigger with less capital.