River Markets has announced it raised $8.5 million in a seed round led by Haun Ventures. Y Combinator and Coinbase Ventures also participated in the fundraise, which closed in July.

The startup provides a platform that allows professional traders to trade across multiple prediction markets from a single interface. Co-founded by CEO Oscar Levy and CTO Antonin Parrot, River Markets launched in May and is on track to exceed hundreds of millions of dollars in annualised trading volume by year-end.

The funding will be used to hire engineers, build faster trading systems, and expand sales and operations teams. The announcement reflects growing institutional interest in prediction markets as financial tools for hedging risks and trading on economic events.