Prediction markets extended their strong run in March 2026, with combined notional volume across seven tracked platforms reaching roughly $25.7 billion, according to data compiled on Dune Analytics. That figure made March the second-largest month in the past two years, trailing only January 2026, when notional volume hit a record $26.75 billion. February had also been elevated at $23.24 billion, underscoring how quickly the sector has scaled.
With April still incomplete at the time of the report, another $3.9 billion had already been added, bringing cumulative volume since Jan. 1, 2024 to $162.64 billion. The figures point to a market that is no longer a niche experiment. Instead, prediction platforms are attracting sustained participation, with most of the activity flowing to a small number of dominant venues.
Polymarket and Kalshi account for most of the action
March data shows a highly concentrated market structure. Kalshi led the month with about $13 billion in notional volume, while Polymarket followed with approximately $10 billion. Together, the two platforms accounted for the overwhelming majority of all tracked activity. Other platforms in the data set included Crypto.com, Opinion, Limitless, Predict.fun, and Overtime.io, but their contribution remained comparatively small.
The concentration is significant because it highlights where user attention is settling. Polymarket’s volume is described as being driven primarily by politics, followed by crypto, sports, and global events. Kalshi, by contrast, appears to draw heavier activity in economics, financials, and politics, while also extending into narrower categories such as climate and weather and transportation. That divergence suggests the two leaders are not merely competing for the same order flow, but are also shaping different product niches within the broader prediction market ecosystem.
Transaction count surged alongside volume
Trading activity was not only larger in dollar terms; it also expanded meaningfully in transaction count. March saw approximately 207 million transactions across all tracked prediction markets, a notable increase from 155 million in February. Once again, the bulk of that activity was concentrated in the same two names.
Polymarket recorded 115 million transfers in March, while Kalshi posted 88 million. Those numbers reinforce the idea that prediction markets are seeing deeper engagement, not just headline volume. In practical terms, higher transaction counts can indicate more active market participation, denser liquidity, and a growing habit among users to express views on news, politics, macro trends, and event outcomes through tradable contracts.
Open interest nears $940 million
At the time of publication, the sector’s combined open interest stood at about $939.86 million. Here too, the market was overwhelmingly top-heavy. Kalshi led with $487.21 million in open interest, followed by Polymarket at $422.09 million. Together, they represented nearly all active positioning across the space.
Smaller platforms trailed far behind. Predict.fun held about $19.51 million, Opinion had around $10.38 million, and Limitless stood near $666,520. The remaining venues together accounted for only about $3,760. Such a sharp drop-off after the top two platforms illustrates just how concentrated the prediction market landscape has become.
This concentration can cut both ways. On one hand, dominant platforms may benefit from stronger network effects, tighter spreads, and greater user trust. On the other, a market dominated by only a few platforms may become more exposed to platform-specific regulatory, legal, or reputational shocks.
Regulatory pressure remains a major overhang
The volume growth is unfolding against a backdrop of continued scrutiny. The report notes that both Polymarket and Kalshi are attracting demand even as prediction markets face criticism tied to certain controversial contracts, including markets related to the U.S.-Iran conflict. At the same time, Democratic lawmakers in the United States have largely opposed prediction markets and have advanced legislation aimed at tightening oversight.
The regulatory challenge is not limited to Washington. The two leading platforms are also dealing with state-level rules that may conflict with federal guidance, particularly in relation to the Commodity Futures Trading Commission (CFTC). This creates an environment where legal clarity is still developing, even as user participation and capital committed to the space continue to rise.
That tension is central to the current story of prediction markets. Demand is growing, liquidity is deepening, and product breadth is expanding. Yet the same growth that validates the model may also invite tougher supervision. For traders and platform operators alike, the next phase of expansion may depend as much on regulatory outcomes as on product innovation.
A durable role, but an uncertain path forward
For now, the available data suggests prediction markets have established a durable presence in the broader digital asset and event-trading landscape. March’s $25.7 billion notional volume, combined with rising transaction counts and nearly $940 million in open interest, indicates that the sector is retaining momentum rather than fading after isolated spikes.
Still, the path forward is not guaranteed. Much of the market’s strength currently rests on two dominant venues, and both operate under increasing public and regulatory attention. Whether that momentum can be sustained will likely depend on how effectively the platforms navigate oversight, maintain user trust, and continue to attract activity across politics, macro events, and specialized real-world topics.
What is already clear is that prediction markets are no longer peripheral. Based on the latest Dune figures, they are becoming a sizable and increasingly structured segment of the broader crypto-adjacent trading economy, with Polymarket and Kalshi firmly at its center.