How Kalshi, Polymarket and Robinhood are pulling prediction markets into mainstream finance.

A contract that pays one dollar if something happens, and nothing if it does not, sounds like the simplest product in finance. It has also become one of the fastest-growing. Event contracts now sit inside the same apps as stocks and crypto, they carry billion-dollar valuations, and the brokers that list them are booking real revenue.

Wall Street has noticed. Analysts cover the platforms, listed companies are building their own venues, and the conversation has shifted from whether this is a fad to how big the market can get.

Kalshi Moves From Exchange to IPO Candidate

Kalshi was recently valued at $40 billion, and it has announced plans for an IPO that could come in late 2026 or early 2027. For a business that most investors had never heard of a few years ago, that is a remarkable climb.

Its scale also makes it a strategic prize. Bernstein’s view on Kalshi and Polymarket, from analysts led by Ian Moore, is that both companies own the technology stack but trail on distribution, which leaves each one a plausible takeover target as DraftKings, Robinhood and Coinbase push into the space.

Polymarket Puts a Price on Probability

Polymarket’s most recent valuation stands at $15 billion, and the company is expected to pursue an IPO of its own. Its pitch to investors is simple and powerful, a market where the price of a contract reads directly as the crowd’s estimate of how likely an event is.

A contract trading at 70 cents implies roughly a 70% chance. That makes its markets easy to quote, easy to chart and easy to drop into financial coverage, which is part of why the numbers travel so far beyond the platform itself.

Robinhood Is the Broker That Made It Mainstream

If Kalshi and Polymarket built the markets, Robinhood brought them to the masses. By mid-2026 it had traded more than $16 billion worth of event contracts in the year, according to Bernstein.

The revenue followed. In the second quarter, event contracts brought in more than either crypto or equities trading, helping Robinhood to a record $1.31 billion in net revenue, up 32% on the year. Robinhood and Susquehanna also moved to acquire the exchange LedgerX in November 2025, giving the broker its own venue rather than relying on someone else’s.

Where Investors Follow the Market

As event contracts sit next to stocks and ETFs in the same apps, investors need a clear read on what is being traded, how pricing works and how the platforms stack up against one another. A contract on an interest rate decision behaves very differently from one on a sports result, and liquidity, fees and settlement rules vary from venue to venue. That is why dedicated prediction markets by WSN has become part of the research routine for active traders. Coverage that explains how contracts work, tracks the major platforms and compares markets side by side gives investors the context a price alone cannot. It also helps separate a genuinely liquid market from a thin one where a single large order can move the price. The principle is no different from any other corner of the market. Treat a contract like any other position, understand the market before you trade it and size it with the same discipline you would apply to a stock.

What Makes It an Asset Class

Asset classes are defined by liquidity, institutional attention and a route for investors to gain exposure, and event contracts now tick all three. Total prediction market volume reached $20.1 billion in September 2026, according to Macquarie, after a steep climb over the previous year. Combined Kalshi and Polymarket monthly volume went from under $5 billion in September 2025 to around $24 billion by April 2026.

Brokerage research covers the sector, and investors can already gain indirect exposure through listed names such as Robinhood, Coinbase, which has reached roughly $100 million in annualized prediction market revenue, and DraftKings. Comparing figures takes care, since Kalshi reports in contracts and Polymarket in dollars, so totals vary by method. Even so, the direction is not in doubt, and the money flowing through these markets is now large enough to show up in quarterly results.

For readers tracking the listed side of the story, FinancialContent carries the market data and earnings coverage that show how much of this growth is reaching shareholders.

The Next Marker

Kalshi’s IPO plans are the next big test of how public markets value the sector. Whether event contracts become a portfolio staple or settle into a trading niche, the money already tells the story, and Wall Street is treating them as an asset. The next few quarters of broker earnings and listing news will show how far that conviction runs.