Is Dome still operating as an independent company?

No. Dome, the YC F25 unified prediction-market API startup, was acquired by Polymarket on February 19, 2026, and its standalone APIs were fully sunset by April 28, 2026, with developer traffic redirected to Polymarket's native APIs.

Who acquired Dome and why?

Polymarket acquired Dome on February 19, 2026, marking Polymarket's second disclosed acquisition. Deal terms were undisclosed. Dome's founders had previously helped Polymarket scale its blockchain infrastructure during the 2024 US election, likely easing the absorption.

How much funding did Dome raise before being acquired?

Dome raised $500,000 pre-seed via YC's standard deal in September 2025, then an additional $4.7 million seed round with backers including Will Ventures and Y Combinator, per co-founder Kunal Roy, before Polymarket acquired it in February 2026.

Could AI replace what Dome built?

Largely yes. Dome's core work was schema normalization across prediction-market APIs, a task open-source project pmxt already automates with an LLM-assisted 'dome-to-pmxt' codemod as of May 2026, showing the aggregation layer was easily replicated once native APIs improved.

Who are Dome's biggest competitors now that it's been absorbed?

With Dome sunset, developer-facing alternatives marketing themselves as replacements include pmxt (open-source, May 2026), PolyRouter (covering seven venues, January 2026), and Tatum's Prediction Markets API (38 endpoints, June 2026), alongside native Polymarket and Kalshi APIs.

No revenue figures were ever publicly disclosed for Dome, and the company was acquired by Polymarket on February 19, 2026, roughly five months after its October 2025 YC launch, before any public profitability data emerged.

YC Fall 2025 · absorbed · United States

Dome

Built a unified API layer over Polymarket and Kalshi prediction market data.

Little protection left

Assessed 27 July 2026 · Evidence as of 27 July 2026

Not much stands between this business and its pressures.

On the recordSince 27 July 2026 · Checkable from April 28, 2026 · Every call on the record Checkpoint: Dome's standalone APIs go fully end-of-life and traffic redirects to Polymarket's native API

The call

Dome built a thin API over Polymarket and Kalshi data, was bought by Polymarket four months after launch, and its independent product no longer exists.

Dome built software that translated data between different prediction market platforms like Polymarket and Kalshi, making it easier for developers to work with both at once. The company was easy to copy because it was just a translation layer with no secret technology underneath, and AI tools like pmxt (an open-source alternative) already showed how to automate the translation work itself. What mattered most was Dome's direct relationship with Polymarket, which led straight to the acquisition in February 2026, but that connection is not something a standalone company can defend forever. The real story is that Polymarket, after buying Dome, is now using this infrastructure as a strategic weapon to make deals with news outlets and other trading platforms, confirming that this kind of data-connection layer is too valuable for platforms to let stay independent.

Why

AI pressure: pmxt (open-source CCXT-style prediction market API with LLM migration codemod). pmxt ships an automated codemod that rewrites Dome API calls into its own schema, letting AI erase the switching cost overnight. Could AI do the core job? Yes, likely.

Bigger players: Polymarket. Polymarket bought Dome outright in February 2026 and folded its API into native infrastructure, ending Dome as a separate company. Could a giant copy it? Yes, easily.

What protects it. None apparent: the founders' prior work scaling Polymarket's 2024 election infrastructure got them acquired, not a lasting product edge.

What would change this call

Whether Polymarket fully migrates Dome's former developers to its native APIs without churn to pmxt or PolyRouter. Shows whether the acquired API layer retained value or developers left for open alternatives.
Whether pmxt's usage or GitHub activity grows significantly after Dome's shutdown. Confirms open-source tooling absorbed demand once Dome's paid layer vanished.
Whether Kalshi launches or backs a competing unified API for prediction markets. Would show whether the schema-mapping layer becomes a contested feature across venues.

Key numbers

Polymarket acquired Dome, its second official acquisition (2026-02-19)
Dome's public API sunset completed (2026-04-28)
50+ developers built on Dome at YC launch (2025-10-29)

Named risks

Independent Dome brand ceased to exist after April 28, 2026 API sunset, total absorption into Polymarket. Severity: high
No proprietary defensible asset beneath schema-mapping layer, easily replicated by AI codemods. Severity: high
Regulatory turbulence around Polymarket and Kalshi (Senate betting ban, war-market controversies) could restrict the infrastructure layer Dome occupied. Severity: medium
No public revenue disclosure ever existed, making independent viability unverifiable before acquisition. Severity: medium

Rivals, as read in July 2026

Rival	Direction	Evidence
Polymarket	losing to	Acquired Dome outright Feb 19, 2026, absorbing it as internal infrastructure rather than a partner
pmxt	losing to	Open-source project shipped automated 'dome-to-pmxt' migration codemod by May 8, 2026
PolyRouter	contesting	Covers 7 venues (Polymarket, Kalshi, Manifold, Limitless, ProphetX, Novig, SX.bet) as of Jan 7, 2026
Tatum	contesting	Markets 38-endpoint Polymarket and Kalshi API as of June 17, 2026, post-Dome-sunset
Kalshi	gaining on	Pursued CNBC and Tradeweb distribution deals announced same week as Dome acquisition, Feb 2026

Questions people ask

Is Dome still operating as an independent company?: No. Dome, the YC F25 unified prediction-market API startup, was acquired by Polymarket on February 19, 2026, and its standalone APIs were fully sunset by April 28, 2026, with developer traffic redirected to Polymarket's native APIs.
Who acquired Dome and why?: Polymarket acquired Dome on February 19, 2026, marking Polymarket's second disclosed acquisition. Deal terms were undisclosed. Dome's founders had previously helped Polymarket scale its blockchain infrastructure during the 2024 US election, likely easing the absorption.
How much funding did Dome raise before being acquired?: Dome raised $500,000 pre-seed via YC's standard deal in September 2025, then an additional $4.7 million seed round with backers including Will Ventures and Y Combinator, per co-founder Kunal Roy, before Polymarket acquired it in February 2026.
Could AI replace what Dome built?: Largely yes. Dome's core work was schema normalization across prediction-market APIs, a task open-source project pmxt already automates with an LLM-assisted 'dome-to-pmxt' codemod as of May 2026, showing the aggregation layer was easily replicated once native APIs improved.
Who are Dome's biggest competitors now that it's been absorbed?: With Dome sunset, developer-facing alternatives marketing themselves as replacements include pmxt (open-source, May 2026), PolyRouter (covering seven venues, January 2026), and Tatum's Prediction Markets API (38 endpoints, June 2026), alongside native Polymarket and Kalshi APIs.
Is Dome profitable?: No revenue figures were ever publicly disclosed for Dome, and the company was acquired by Polymarket on February 19, 2026, roughly five months after its October 2025 YC launch, before any public profitability data emerged.

Timeline

2026-04-28Dome's standalone APIs reach end-of-life, users redirected to Polymarket's native APIs
2026-02-20Reports confirm Dome's $4.7M seed round backers including Will Ventures, Y Combinator
2026-02-19Polymarket acquires Dome, its second officially disclosed acquisition
2025-10-29Dome publicly launches on Y Combinator, reports 50+ developers building on platform
2025-09Dome raises $500,000 pre-seed via YC standard deal
2024Founders Kurush Dubash and Kunal Roy help scale Polymarket's blockchain infrastructure

Revision history

27 July 2026

First assessed. Little protection left. The text above is fixed as of this date and is not edited afterwards.

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