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River Markets

Active

Prime brokerage for prediction markets

Spring 2026Founded 20262 peopleSan Francisco, CA, USA
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AI insightcan contain mistakes
Prediction Market BrokerageTransactionalProfessional traders, hedge funds, market participantsLow competition
Moat
Unified API across fragmented venues; execution optimization; professional trader relationships.
Key risk
Prediction market adoption slower than expected; regulatory crackdowns; low-margin transaction business.
Why now
Multiple prediction market venues launching; professional traders need portfolio and order management.
Competitors
Emerging space, direct venue access, Manual aggregation
↻ Pivot / rename signal

This company has previously operated under β€œCentos Group”. A rename frequently marks a pivot in positioning or product β€” useful raw material for variant ideas.

About

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.

Founders Β· 2

Oscar Levy
Oscar LevyCo-Founder
Berkeley

Co-Founder at River Markets. Previously quant at BlackRock managing models trading $6B, Sandbar Asset Management ($2B AUM hedge fund). MA Financial Engineering from UC Berkeley.

Antonin Parrot
Antonin ParrotFounder

Co-founder of River Markets, the prime broker for prediction markets. I have a background in engineering and CS, and I've been working as a quant at a high frequency option market making trading shop.

FintechTrading

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