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River Markets

YC X26

San Francisco, US · Founded 2026 · 2 employees · 10 known investors

Find your way into River Markets

10,684 people in our graph share verified history with the River Markets team — schools, employers, funds. One of them is your warm intro.

Achintya Chaudhariunlockedknows Antonin Parrot · together at Valkyrie Trading (overlapped)
knows the team · via Nexthink
×9knows the team · via BlackRock
knows the team · via TF1 le Groupe

River Markets provides a unified trading terminal and API for prediction market desks, aggregating order books and execution across multiple prediction exchanges like Kalshi and Polymarket.

Also known as Centos Group

FintechSaaSUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (X26)

River Markets was founded in 2026 by Oscar Levy and Antonin Parrot.

OLOscar Levy
Oscar LevyCo-FounderOscar Levy is a co-founder at River Markets with prior quantitative research roles at BlackRock and Sandbar Asset Management. He holds a Master's degree in Financial Engineering from UC Berkeley.
APAntonin Parrot
Antonin ParrotCo-FounderAntonin Parrot is co-founder of River Markets and has a background in engineering and computer science, with prior experience as a quantitative trader at a high-frequency options market-making firm.

Investors · 10

Y Combinatorlisted by Y CombinatorSan Francisco · $150K

How we know: the Y Combinator directory · Not right? Tell us

Cherry VenturesreportedBerlin · $2.2M – $7.7M

How we know: Y Combinator's founder network · Not right? Tell us

Coinbase VenturesreportedSan Francisco · $100K – $10M

How we know: Y Combinator's founder network · Not right? Tell us

DragonflyreportedNew York City · $3M – $30M

How we know: Y Combinator's founder network · Not right? Tell us

Dunbar CapitalreportedCambridge · $25K – $1M

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humbitionreportedMiami

How we know: Y Combinator's founder network · Not right? Tell us

Kima VenturesreportedParis · $50K – $5M

How we know: Y Combinator's founder network · Not right? Tell us

Stack AssetreportedBrooklyn

How we know: Y Combinator's founder network · Not right? Tell us

Venture Investment AssociatesreportedPeapack

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Competitors · 3

by search overlap
River Financial4 shared keywordsRiver is a bitcoin bank providing full-reserve custody and financial services built on sound money principles. The company publishes proof of reserves and public financials to demonstrate the security and soundness of its operations.
CryptoRank3 shared keywordsCryptorank is a data platform that tracks and publishes information on cryptocurrency funding rounds, project valuations, and investment activity. It aggregates and verifies funding data from public sources for the crypto market.
MetaMask3 shared keywordsMetaMask is a self-custody crypto wallet that lets users trade, swap, and use tokens, including features like leveraged trading, tokenized stocks and ETFs, spending crypto for purchases via a card, and earning yield. It also provides developer tools for integrating with MetaMask and building on-chain (walletless) decentralized apps.

Companies competing with River Markets for the same Google search keywords, organic and paid, via search-intersection analysis.

In the news

River Markets - The prime broker for prediction marketsycombinator.com · May 2026River Markets Funding | Complete Analysis | Extruct AIextruct.ai

Frequently asked questions

What does River Markets do?
River Markets provides a unified trading terminal and API for prediction market desks, aggregating order books and execution across multiple prediction exchanges like Kalshi and Polymarket.
Who founded River Markets?
River Markets was founded by Oscar Levy, Antonin Parrot in 2026.
Who are River Markets's investors?
River Markets's investors include Haun Ventures, Y Combinator, Cherry Ventures, Coinbase Ventures, Dragonfly, Dunbar Capital, humbition, Kima Ventures and 2 more.
Where is River Markets headquartered?
River Markets is headquartered in San Francisco, US.