River Markets
San Francisco, United States
◆ Total Raised
$8.5M
◆ Stage
seed
◆ Location
San Francisco, United States
◆ Founded
2026
◆ Team size
1-10
◆ Links
◆ About River Markets
A San Francisco-based startup building a prime brokerage layer for prediction markets that aggregates access to multiple venues including Kalshi, Polymarket, and others into a single institutional trading platform.
◆ What sets it apart
It consolidates fragmented prediction-market venues into a single institutional-grade trading stack with cross-venue routing, unified market data, and consolidated risk and P&L.
◆ Sectors
◆ Business
ModelSaaS
CustomerHedge funds, proprietary trading firms, and professional traders active in prediction markets
◆ Notable
- Backed by Y Combinator
- Raised an $8.5M seed round
- Reportedly facilitated over $50M in trading volume
- Claims support for three of the top 10 traders on both Kalshi and Polymarket
◆ Backing funds on Raise
◆ Funding rounds
1 Jul 2026
Led by Haun Ventures
With Y Combinator, Coinbase Ventures, Qube Research Technologies
◆ Explore the market
◆ FAQ
What does River Markets do?
A San Francisco-based startup building a prime brokerage layer for prediction markets that aggregates access to multiple venues including Kalshi, Polymarket, and others into a single institutional trading platform.
Where is River Markets based?
River Markets is based in San Francisco, United States, founded in 2026.
How much has River Markets raised?
River Markets has raised $8.5M in tracked funding and is currently at the seed stage.
Who has invested in River Markets?
Investors in River Markets include Y Combinator, Coinbase and Novig.