River Markets Completes an $8.5M Seed Round Led by Haun Ventures

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On August 11, 2026, River Markets secured $8.5 million in seed funding led by Haun Ventures, with participation from Y Combinator, Coinbase Ventures, and Qube Research Technologies. Founded in 2023, the startup provides institutional investors with a unified platform for prediction market trading, risk management, and large-order execution. The funding will expand the engineering team, enhance the speed and security of the trading system, and develop tools for cross-platform trading and capital management. Price prediction capabilities will be upgraded to support institutional-grade funding rates and market efficiency.

ChainThink reports that on August 11, according to Fortune, predictive market trading infrastructure startup River Markets completed an $8.5 million seed round led by Haun Ventures.

Investors in this round include Y Combinator, Coinbase Ventures, and Qube Research Technologies.

River Markets, founded in 2023, provides institutional investors with a unified platform for prediction markets, enabling professional traders to trade, manage risk, and execute large orders across multiple prediction markets.

This round of funding will primarily be used to expand the engineering team, enhance the speed and security of the trading system, grow institutional client services, and develop new tools to support large-scale asset management and cross-platform trading.

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