TechFlame - On-chain prediction market platform Polymarket has announced the acquisition of prediction market API startup Dome, with the transaction amount undisclosed. This marks Polymarket's second official acquisition.

Dome, a Y Combinator Fall 2025 incubated project, provides a unified prediction market API that enables developers to build applications, trading bots, and data dashboards compatible with multiple platforms including Polymarket and Kalshi. The company previously secured a $500,000 investment from YC and completed a $4.7 million seed funding round.

Polymarket currently holds an approximate valuation of $9 billion and has been actively expanding its business through mergers and partnerships. Its previous acquisition of U.S.-licensed derivatives exchange QCEX facilitated its re-entry into the American market. Concurrently, the company has established distribution collaborations with Major League Soccer (MLS), the National Hockey League (NHL), and media platform Substack.