Polymarket Buys Dome to Expand Prediction Market API

Polymarket acquired YC-backed Dome to expand its prediction market API; Dome raised $500K from YC and $4.7M seed funding.

Polymarket has acquired startup Dome as it moves to expand its prediction market infrastructure.

The deal terms were not disclosed, and the acquisition marks the company’s second official purchase to date.

Polymarket Buys Dome to Expand Prediction Market API

Prediction market provider Polymarket confirmed it has acquired Dome for an undisclosed sum.

Dome was part of Y Combinator’s Fall 2025 cohort. The startup provides a unified API for prediction markets across multiple platforms.

Dome’s technology allows developers to build apps, bots, dashboards, and trading tools.

These tools can function across platforms such as Polymarket and Kalshi. The unified API structure is designed to simplify access to market data and execution systems.

In a post on X, Dome stated, “We’re excited to bring our focus on speed, reliability, and dev experience to the world’s largest prediction market!”

The company said it will continue working on improving developer tools within the broader ecosystem.

Dome’s Background and Funding History

Dome previously raised $500,000 from Y Combinator. It also secured $4.7 million in a seed funding round. The funding details were referenced in public profiles of the company’s founders.

Co-founder Kunal Roy was a founding engineer at Alchemy. Kurush Dubash, the other co-founder, also worked as a founding engineer at Alchemy.

Both founders participated in YC’s Fall 2025 accelerator program. The startup positioned itself as infrastructure for prediction market developers.

Its API allowed builders to connect with multiple trading venues through one interface. This structure aimed to reduce integration complexity for developers.

Related Reading: PolyMarket To Partner With Major US Soccer Team

Second Acquisition as Polymarket Expands

The Dome acquisition follows Polymarket’s earlier purchase of QCEX. QCEX is a U.S.-licensed derivatives exchange.

That deal supported Polymarket’s return to the United States market after previous regulatory restrictions.

Polymarket was last valued at $9 billion. Reports have indicated that the firm may seek additional funding at a higher valuation. However, the company has not confirmed new fundraising plans.

In addition to acquisitions, Polymarket has signed several distribution partnerships. These include agreements with Major League Soccer and the National Hockey League. 

The firm has also partnered with media platforms, including Substack. The acquisition of Dome adds technical infrastructure to Polymarket’s broader expansion strategy.

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