The 2026 FIFA World Cup is establishing itself as a pivotal traffic event in prediction market history, with Bernstein projecting an additional trading volume between $5 billion and $10 billion. While this volume expansion is significant, the underlying shift in competitive logic represents a more profound industry transformation. Recent discourse has centered on the rivalry between Polymarket and Kalshi, yet Kalshi CEO Tarek Mansour recently clarified in an interview with Front Office Sports that Polymarket is not the primary adversary. Instead, the most substantial threats originate from established financial entities including CME Group, Robinhood, and DraftKings. Bernstein reinforces this view, noting that platforms possessing robust user entry points and distribution channels are positioned to capture the majority of the World Cup value. This signals a redefinition of competitive boundaries as traditional brokerages and exchanges collectively enter the sector.

The strategic landscape has shifted from prediction markets operating as an independent track to becoming integrated components of existing financial ecosystems. Robinhood has executed the most aggressive expansion in this domain, launching a Prediction Markets Hub and integrating its CFTC-regulated proprietary exchange, Rothera, in collaboration with Kalshi. This integration allows users to trade event contracts covering the World Cup, Federal Reserve rates, economic data, and political events directly within their existing accounts, eliminating the need for separate applications. Data compiled by Woofun AI shows that prediction markets have become one of Robinhood's fastest-growing business lines, with over 12 billion event contracts traded in 2025, rising to approximately 16 billion by May 2026. In the first quarter alone, the company facilitated 8.8 billion event contract trades, propelling 'other trading revenue' to grow by 320% year-on-year to $147 million.

The World Cup served as a critical catalyst for this acceleration. In early June, Robinhood officially launched its World Cup prediction market service utilizing the Rothera product, a move that triggered a single-day stock price increase of over 5%. Bernstein forecasts that Robinhood's prediction market revenue will reach approximately $586 million in 2026, representing a year-on-year increase of about 286%. This segment is expected to account for double-digit shares of total trading revenue, emerging as a primary driver of new income for the firm. Beyond Robinhood, other traditional exchanges and sports betting platforms have accelerated their deployment. Interactive Brokers (IBKR) integrated event contracts from Kalshi, CME Group, and ForecastEx into a unified account system in May, enabling users to access economic, political, and sports event trading alongside stocks, options, and futures with unified price comparison.

CME Group, a leading global derivatives exchange, entered the market through event contracts, partnering with FanDuel in 2025 to launch FanDuel Predicts by year-end. This initiative aims to leverage FanDuel's extensive user base to promote event contracts to the broader retail market.

Concurrently, DraftKings launched its independent product, DraftKings Predictions, at the end of 2025, entering the CFTC-regulated space to extend its sports betting user base into event contract trading across sports, finance, and entertainment. Webull has also integrated Kalshi's event contract services, illustrating a broader trend where traditional brokerages view prediction markets as functional modules rather than standalone tracks. Users can now predict World Cup champions within Robinhood, trade event contracts on FanDuel or DraftKings, or bet on Federal Reserve rate cuts via Interactive Brokers without switching applications.

For these incumbents, prediction markets are not core businesses but represent low marginal cost expansions leveraging existing account, funding, and user systems. This dynamic alters competitive boundaries, raising the question of how dedicated prediction market platforms can survive the shadow of these giants. The industry response involves two primary paths: expanding trading categories and evolving into infrastructure layers. Initially focused on elections, prediction markets have diversified into sports, economic data, and entertainment. Bernstein identifies the World Cup as a watershed moment because sports events allow the industry to break dependence on election cycles and enter mainstream consumer scenarios.

Additionally, platforms like Polymarket and Kalshi are exploring perpetual contracts and derivatives to address continuous trading needs and mitigate single-event cycle impacts.

A more critical shift involves the evolution toward infrastructure and distribution layers. While Kalshi and Polymarket were once viewed as direct competitors, their trajectories diverged significantly in the second half of 2025. Woofun AI notes that as of May 2026, Kalshi's monthly trading volume reached $17.9 billion, capturing about 57% of the market share, while Polymarket's volume dropped to approximately $7.1 billion. Kalshi's lead is driven by compliance advantages and differentiated channel expansion, with platforms like Robinhood, Coinbase, Webull, and Interactive Brokers acting as cross-platform liquidity providers.

However, this model faces erosion as distributors begin absorbing infrastructure capabilities. Robinhood exemplifies this by building its own system via Rothera rather than relying solely on revenue sharing, destabilizing the value proposition of pure infrastructure providers.

The competitive dynamic is shifting from end-user acquisition to battles over channels, liquidity, and underlying capabilities. This mirrors the internet-era competition between Zoom and Microsoft Teams or Google Meet. Zoom defined the video conferencing category with professional experiences, but Microsoft and Google embedded Teams and Meet into Office 365 and Gmail ecosystems, compressing video calls from standalone apps to collaboration suite tabs. The outcome was not the replacement of Zoom but the expansion of entry-type platforms that rewrote growth boundaries, forcing Zoom to migrate toward higher-level capabilities like enterprise collaboration and AI. Prediction markets currently stand at a similar historical crossroads. Woofun AI analysis suggests that whether Kalshi and Polymarket can step out of the giants' shadows will depend on their ability to evolve beyond simple liquidity provision into indispensable, high-value infrastructure layers.