Polymarket Acquires Dome, a Unified API Platform

Polymarket has acquired Dome, a Y Combinator-backed startup that built a unified API platform for prediction markets. The acquisition was announced and confirmed on February 19, 2026, via posts on X by Polymarket and Dome’s team.

Financial terms were not disclosed, marking this as Polymarket’s second known acquisition following its 2025 purchase of CFTC-licensed derivatives exchange QCEX to support its U.S. re-entry. Dome provided a unified API and SDKs that enabled developers to: Access real-time and historical data like market odds, trades, order books.

This acquisition comes amid Polymarket’s growth, including recent partnerships with Substack for embedding live market data. The deal signals consolidation in the prediction markets space, boosting accessibility and innovation for developers and users alike.

The acquisition of Dome by Polymarket has several notable short- and medium-term impacts across the prediction markets sector, developer ecosystem, and Polymarket’s strategic positioning. Dome’s unified API; originally enabling single-integration access to data, trades, and analytics across platforms like Polymarket and Kalshi is now internalized.

This allows Polymarket to dramatically improve its own developer tools, reduce friction for builders, and create a more seamless experience for apps, bots, dashboards, algorithmic trading tools, and third-party integrations.

Polymarket gains insights into and potential influence over cross-platform activity, including on rival Kalshi. It reduces fragmentation in data access, making Polymarket the go-to hub for developers rather than forcing them to build separate integrations.

Dome’s team including co-founders from Alchemy joins Polymarket, accelerating roadmap execution on APIs, data reliability, and new features.