YCX26ยท DevtoolsRiver Markets
Prime brokerage for prediction markets
Founders
- Oscar LevyFounder/CEO
- Antonin ParrotFounder/CTO
Same space
Competitors
Closest in what they build, same category.
Adjacent
Overlapping tags, a different niche.
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attimetF24Building the Prime RadiantShared: prime, marketActive
TotalisX26derivative layer for prediction marketsShared: prediction, marketActive
SelfinF25Institutional liquidity across prediction marketsShared: prediction, market, eventActive
SnapTradeW22Plaid for tradingShared: brokerage, account, apiActive
Also from X26 in Developer tools
Batchmates in Spring 2026.
About River Markets
River Markets is the prime brokerage for prediction markets. We aggregate every major event-contract venue into one account, giving professional traders best execution, portfolio and order management systems, and a unified API.
San Francisco, CA, USA
River Markets: questions
Which YC batch was River Markets in?
River Markets was in Y Combinator's Spring 2026 batch (X26).
Is River Markets still active?
Y Combinator lists River Markets as active.
Who founded River Markets?
River Markets's founders, as listed on its YC page: Oscar Levy (Founder/CEO), Antonin Parrot (Founder/CTO).
Where is River Markets based?
River Markets lists San Francisco, CA, USA as its location on YC's directory.
Not affiliated with Y Combinator. From YC's public directory. Logos via logo.dev; trademarks belong to their owners.