Polymarket acquires prediction market API startup Dome

According to The Block, the on-chain prediction market platform Polymarket has announced the acquisition of the prediction market API startup Dome, with the transaction amount undisclosed. This is Polymarket's second official acquisition.

Dome is a Y Combinator Fall 2025 incubator project that provides a unified prediction market API, helping developers build applications, trading bots, and data dashboards that can interface with multiple platforms such as Polymarket and Kalshi.

The company previously received a $500,000 investment from YC and completed a $4.7 million seed round of financing. Polymarket is currently valued at approximately $9 billion and has been continuously expanding its business landscape through mergers and acquisitions; it previously acquired the U.S. licensed derivatives exchange QCEX to aid its return to the U.S. market, and the company has also established distribution partnerships with Major League Soccer (MLS), the National Hockey League (NHL), and the media platform Substack.