Dome API is a unified developer infrastructure platform that provides REST APIs and SDKs for accessing prediction market data across multiple platforms including Polymarket and Kalshi. It offers real-time market prices, historical candlestick data, orderbook access, wallet analytics, and activity tracking through a single integration point. The company was part of Y Combinator's Fall 2025 cohort and was acquired by Polymarket in February 2026.

Which prediction markets does Dome API support?

Dome API currently supports Polymarket and Kalshi, the two largest prediction markets by trading volume. According to Sacra research, Kalshi recorded approximately $17 billion in trading volume for 2025 while Polymarket reached approximately $22 billion. The platform is designed to add additional prediction markets over time, providing a unified interface across the ecosystem.

Is Dome API free to use?

Dome API offers a free tier for developers, as noted on their homepage with the call-to-action "Sign Up for Free." This allows developers to begin integrating and testing without upfront costs. Enterprise pricing for higher rate limits and additional features is available but not publicly documented on the website.

What data can I access through Dome API?

Dome API provides comprehensive prediction market data including: real-time market prices, historical candlestick/OHLCV data, full orderbook depth, wallet analytics and activity tracking, trade history, and cross-platform market normalization. The API also tracks specialized prediction market operations like merges, splits, and redeems that are unique to conditional token mechanics.

Does Dome API have SDKs?

Yes, Dome provides official SDKs for JavaScript/TypeScript (available as `@dome-api/sdk` on npm) and Python (available as `dome-api-sdk` on PyPI). The Python SDK includes async support, automatic WebSocket reconnection with exponential backoff, and subscription management. Both SDKs provide typed interfaces for API endpoints.

Can I trade through Dome API?

No, Dome API is a data infrastructure provider, not a trading venue. It provides access to market data, orderbooks, and analytics but does not support trade execution. To actually trade, you need to connect directly to the underlying platforms (Polymarket, Kalshi) using their respective trading APIs or web interfaces.

Who founded Dome API?

Dome was founded by Kunal Roy and Kurush Dubash, both former founding engineers at Alchemy, a leading Ethereum infrastructure provider. Kurush Dubash serves as CEO. The founders' background in blockchain infrastructure informed Dome's approach to building developer tooling for prediction markets.

Did Polymarket acquire Dome?

Yes, Polymarket acquired Dome in February 2026, marking Polymarket's second official acquisition. The acquisition signals Polymarket's strategy to strengthen its developer ecosystem and standardize cross-platform market APIs. Dome was part of Y Combinator's Fall 2025 accelerator cohort prior to the acquisition.

How does Dome API handle WebSocket reconnection?

The Python SDK implements automatic reconnection with exponential backoff and intelligent subscription management. When a WebSocket connection drops, the SDK automatically attempts to reconnect with increasing delays between attempts (exponential backoff). Upon successful reconnection, the SDK re-subscribes to all previously active channels, ensuring minimal data loss during network instability.

What is the difference between Dome's REST API and WebSocket feeds?

Dome's REST API is designed for on-demand queries: fetching historical data, querying current prices, and retrieving wallet analytics. The WebSocket endpoint (`wss://ws.domeapi.io/`) is for real-time streaming: subscribing to live order updates, price changes, and market activity as they occur. Use REST for analysis and backtesting; use WebSockets for live dashboards and trading bots.

How does Dome normalize data across different prediction market platforms?

Dome provides a unified data schema that abstracts platform-specific differences. Market identifiers, price formats, and orderbook structures are normalized so developers can use the same code to query Polymarket and Kalshi data. However, the underlying mechanics (order types, settlement processes) differ between platforms, so developers should still understand each venue's characteristics for trading applications.

What happened to Dome after the Polymarket acquisition?

Following the February 2026 acquisition by Polymarket, Dome continues to operate as a developer infrastructure product. The acquisition is part of Polymarket's strategy to expand its developer tooling and API capabilities. The long-term integration roadmap—whether Dome will remain a standalone product or be fully merged into Polymarket's developer offerings—has not been publicly detailed.

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Dome API

Unified API and SDK platform for accessing real-time and historical data across multiple prediction markets.

infrastructureacquiredInfrastructure

Open Dome API

Docs Website

Unified API layer connecting developers to Polymarket, Kalshi, and other prediction markets
Provides real-time orderbooks, historical data, wallet analytics via single integration
Y Combinator F25 startup acquired by Polymarket in February 2026

Last verified: Feb 26, 2026

Key Facts

Identity

Legal NameDome

Founded2025

Founders[object Object], [object Object]

Team Size2-10

Classification

Stack RolesDeveloper Tooling, Data Analytics

ChainsPolygon, Multi-chain

Geographyglobal

Product

Market TypesEvent Markets

Metrics

platforms_supported

2+90%

as of 2026-02-26

Summary

## Overview

Dome API is a developer infrastructure platform that provides unified APIs and SDKs for accessing prediction market data across multiple platforms. Founded in 2025 by Kunal Roy and Kurush Dubash—both former founding engineers at Alchemy, a leading Ethereum infrastructure provider—Dome was part of Y Combinator's Fall 2025 cohort.

## What It Does

Dome solves a critical fragmentation problem in the prediction market ecosystem. Rather than building separate integrations for each trading venue, developers can use Dome's unified API layer to connect to multiple prediction market platforms through a single integration. The platform currently supports Polymarket and Kalshi, two of the largest prediction markets by volume.

## Core Capabilities

The API provides comprehensive data access including:

- Real-time market prices via REST and WebSocket endpoints
- Historical candlestick data for backtesting and analysis
- Full orderbook data with live trade tracking
- Wallet analytics for tracking user activity across platforms
- Activity feeds including merges, splits, and redeems
- Cross-platform market normalization for building unified dashboards

## Developer Experience

Dome offers official SDKs for JavaScript/TypeScript (@dome-api/sdk on npm) and Python (dome-api-sdk on PyPI). The WebSocket implementation includes automatic reconnection with exponential backoff and subscription management.

## Acquisition by Polymarket

In February 2026, Polymarket acquired Dome, marking its second official acquisition. The deal signals Polymarket's strategy to standardize cross-platform market APIs and expand its developer ecosystem. The acquisition validates Dome's approach to prediction market infrastructure.

## Why It Matters

For prediction market developers, Dome eliminates the engineering overhead of maintaining multiple API integrations. For traders and analysts, it provides unified access to historical data not readily available from market providers themselves—critical for backtesting strategies and conducting cross-platform market analysis.

Sources: [S1, S2, S3, S4, S5, S6, S7, S8]

Key Features

Unified Multi-Platform API95%

Single integration point for Polymarket, Kalshi, and other prediction markets.

Real-Time WebSocket Feeds90%

Subscribe to live order data, price updates, and market activity via WebSocket.

Historical Candlestick Data90%

Access OHLCV candlestick data for backtesting and technical analysis.

Full Orderbook Access90%

Query complete orderbook depth across supported prediction markets.

Wallet Analytics85%

Track trading activity, positions, and performance for specific wallets.

Official SDKs (JS/TS & Python)90%

Production-ready SDKs for JavaScript/TypeScript and Python with type safety.

Activity Tracking (Merges, Splits, Redeems)85%

Monitor all user activity types including complex multi-token operations.

Free Tier Available85%

Start building with no upfront cost via the free developer tier.

How People Use Dome API

Build a Cross-Platform Prediction Market Dashboard

85%

Developers building consumer-facing analytics or trading interfaces

You want to create a unified dashboard that displays markets from both Polymarket and Kalshi side-by-side, showing prices, volumes, and orderbook depth in real-time. Without Dome, you'd need to build and maintain two separate API integrations with different data formats and authentication schemes.

^1,2,8

Backtest a Prediction Market Trading Strategy

80%

Quant traders and researchers developing systematic strategies

You have a hypothesis about momentum in political prediction markets and want to test it against historical data before risking capital. You need consistent OHLCV data across multiple election cycles and platforms, which individual exchanges may not provide or may format inconsistently.

^1,2

Track Whale Activity Across Prediction Markets

75%

Traders seeking alpha from on-chain intelligence and position tracking

You want to monitor large traders' positions across Polymarket and Kalshi to identify informed money flows. You need to track specific wallet addresses, see their positions, and receive alerts when they make significant moves.

^1,2

Build a Prediction Market Arbitrage Bot

75%

Algorithmic traders exploiting pricing inefficiencies between platforms

The same prediction market event may be priced differently on Polymarket versus Kalshi due to liquidity fragmentation. You want to automatically detect and exploit these price discrepancies by simultaneously buying on the cheaper platform and selling on the more expensive one.

^1,2,3

Alternatives to Dome API

Polymarket API90%

Native API for Polymarket data; use if you only need single-platform access

Kalshi API85%

Official Kalshi API for Kalshi-specific data; better for regulated US access

Pyth Network70%

Decentralized oracle for price feeds; different focus on on-chain data delivery

Chainlink65%

Largest oracle network; focuses on smart contract data feeds, not prediction markets

Dune Analytics70%

Blockchain analytics platform; can query prediction market data via SQL dashboards

Flipside Crypto65%

On-chain data analytics; alternative for blockchain-based prediction market analysis

Dome API vs Others

Dome API vs Polymarket Native API

Dimension	Dome API	Polymarket Native API	Notes
Platform Coverage	Polymarket + Kalshi + more	Polymarket only	Dome provides cross-platform access^1,2
Historical Data	Full historical orderbooks	Limited historical access	Dome specializes in historical data^1,2
Direct Trading	Data access only	Full trading capabilities	Native API required for execution²
Official Support	Now via Polymarket (acquired)	Official Polymarket product	Dome was acquired by Polymarket⁴
SDK Quality	Multi-language SDKs	Platform-specific SDKs	Both offer developer tooling^2,8

Rule of thumb

Use Dome when you need cross-platform data or historical orderbooks. Use Polymarket's native API when you need execution capabilities or are building exclusively for Polymarket. Post-acquisition, Dome may become the preferred developer interface for Polymarket data access.

^1,2,4

Dome API vs Kalshi API

Dimension	Dome API	Kalshi API	Notes
Platform Coverage	Multi-platform	Kalshi only	Dome abstracts multiple venues^1,2
Regulatory Status	Data provider (unregulated)	Regulated CFTC exchange	Kalshi has US regulatory approval¹
Execution	Data access only	Full trading supported	Execution requires Kalshi API^1,2
Geographic Access	Global data access	US-focused with restrictions	Data access has fewer restrictions¹

Rule of thumb

Use Dome for analytics and cross-platform comparison. Use Kalshi's API directly when you need to execute trades on Kalshi or require official exchange data with regulatory backing. Dome is better for research; Kalshi API is required for trading.

^1,2

Dome API Risks & Limitations

Acquisition Integration Uncertainty

80%

Most affects: Developers building long-term infrastructure on Dome's cross-platform capabilities

^4,6,7

Data Execution Gap

90%

Most affects: Algorithmic traders building end-to-end automated trading systems

^1,2

Platform Dependency Risk

85%

Most affects: Applications requiring guaranteed uptime and data availability

^1,2

Limited Platform Coverage

85%

Most affects: Analysts requiring comprehensive ecosystem-wide prediction market data

^1,2

Regulatory Data Access Changes

70%

Most affects: Users in regulated jurisdictions relying on consistent data access

Timeline

Feb 20, 202695%

Polymarket acquires Dome

^4,6,7

Dec 1, 202585%

Python SDK released on PyPI

⁸

Oct 1, 202580%

Dome API launches with Polymarket and Kalshi support

^1,2,3

Sep 1, 202590%

Dome joins Y Combinator Fall 2025 cohort

^3,4

What Changed Recently

Feb 20, 2026

Acquired by Polymarket; future as independent cross-platform provider uncertain

^4,6,7

95%

Feb 26, 2026

Website updated with acquisition announcement banner linking to blog post

90%

Relationships

backed_by

Polymarket95%

Acquired Dome in February 2026; Dome now operates under Polymarket ownership

Y Combinator90%

Dome was part of Y Combinator's Fall 2025 accelerator cohort

integrates_with

Kalshi95%

Dome provides API access to Kalshi market data as a supported platform

similar_to

Alchemy85%

Both founders were founding engineers at Alchemy; similar infrastructure-focused approach

competes_with

Pyth Network60%

Both provide data infrastructure, though Pyth focuses on oracle feeds for DeFi

FAQ

Sources & Verification

Post-acquisition future direction uncertain; monitor for product changes

No public pricing details beyond free tier mention

No official GitHub repository found; only community wrapper exists

Dome - APIs for prediction markets

official_website

DomeFeb 26, 2026S1

Dome API Documentation

docs

DomeFeb 26, 2026S2

Dome: A unified API for prediction markets

database

Y CombinatorFeb 26, 2026S3

Polymarket buys prediction market API startup Dome

press

The BlockFeb 26, 2026S4

Dome - Crunchbase Company Profile

database

CrunchbaseFeb 26, 2026S5

Kurush Dubash, CEO of Dome, on unified API for prediction markets

press

SacraFeb 26, 2026S6

Polymarket's Dome Acquisition analysis

press

AInvestFeb 26, 2026S7

dome-api-sdk - Python SDK on PyPI

docs

PyPIFeb 26, 2026S8

Data QualityCompleteness: 82%Confidence: 82%

Help Improve This Page

This dossier for Dome API has some gaps. If you have knowledge about any of the following areas, consider contributing.

Enterprise pricing details

Not publicly documented on website or docs

Suggested sources

- Contact Dome sales directly
- Review competitor pricing for context

Exact acquisition terms

Financial details not disclosed in press coverage

Suggested sources

- SEC filings if applicable
- Future Polymarket financial reports

Team size and headquarters

Not listed on website, Crunchbase, or YC profile

Suggested sources

- LinkedIn company page
- Founder interviews

Topic Hubs

prediction-market-infrastructure developer-tooling market-data-api y-combinator-startups polymarket-ecosystem

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Summary

## Overview

## What It Does

## Core Capabilities

The API provides comprehensive data access including:

## Developer Experience

## Acquisition by Polymarket

## Why It Matters

Sources: [S1, S2, S3, S4, S5, S6, S7, S8]

Dimension

Dome API

Polymarket Native API

Notes

Platform Coverage

Polymarket + Kalshi + more

Polymarket only

Dome provides cross-platform access^1,2

Historical Data

Full historical orderbooks

Limited historical access

Dome specializes in historical data^1,2

Direct Trading

Data access only

Full trading capabilities

Native API required for execution²

Official Support

Now via Polymarket (acquired)

Official Polymarket product

Dome was acquired by Polymarket⁴

SDK Quality

Multi-language SDKs

Platform-specific SDKs

Both offer developer tooling^2,8

Dimension

Dome API

Kalshi API

Notes

Platform Coverage

Multi-platform

Kalshi only

Dome abstracts multiple venues^1,2

Regulatory Status

Data provider (unregulated)

Regulated CFTC exchange

Kalshi has US regulatory approval¹

Execution

Data access only

Full trading supported

Execution requires Kalshi API^1,2

Geographic Access

Global data access

US-focused with restrictions

Data access has fewer restrictions¹