Welcome to River Markets
River Markets provides a unified prime brokerage interface for prediction markets, including:- Liquidity aggregation across multiple exchanges
- Smart order routing to get the best execution
- Market and data search with unified identifiers
- Portfolio management with subaccounts
Supported Exchanges
| Exchange | Markets | Status |
|---|---|---|
| Kalshi | US regulated prediction markets | Available |
| Polymarket | Crypto prediction markets | Available |
| Polymarket US | US regulated prediction markets | Coming soon |
| ForecastEx | US regulated prediction markets | Coming soon |
| MIAXdx | US regulated markets | Coming soon |
How It Works
- Search for markets across all supported exchanges using a single API
- Place orders using unified River IDs — no need to manage exchange-specific identifiers
- Track positions and fills in real-time across your entire portfolio
- Manage strategies with isolated subaccounts
Quickstart
Get up and running in 5 minutes
API Reference
Explore the full API
Core Concepts
Understand River IDs, subaccounts, and order types