Prediction markets continued their strong run in March 2026, posting one of the largest monthly totals seen over the past two years. According to data compiled by Dune Analytics, roughly seven tracked platforms generated a combined $25.7 billion in notional volume during the month. That made March the second-highest month on record in the period covered, trailing only January 2026, which reached $26.75 billion. February had already set a high bar at $23.24 billion, underscoring that elevated activity has not been a one-off spike but part of a broader trend.
The pace remains notable even beyond March. The report notes that April, while still incomplete at the time of publication, had already added $3.9 billion in volume. Taken together, prediction markets have accumulated $162.64 billion in notional volume since Jan. 1, 2024. That figure illustrates how quickly the sector has scaled from a niche corner of internet speculation into a more established segment spanning politics, economics, crypto, sports, and event-driven trading.
Polymarket and Kalshi Account for Most of the Market
Although the Dune dashboard tracked seven distinct prediction market venues in March, the business remained heavily concentrated in two names: Kalshi and Polymarket. Kalshi led the month with $13 billion in notional volume, while Polymarket followed with $10 billion. The remaining platforms—Crypto.com, Opinion, Limitless, Predict.fun, and Overtime.io—made up the rest of the field but at much smaller scale.
This concentration is one of the clearest takeaways from the latest dataset. Rather than a broadly distributed market with many midsized competitors, prediction markets currently appear top-heavy, with most liquidity and user attention clustering around the largest venues. For market participants, that concentration can be a double-edged sword. On one hand, it can improve liquidity and price discovery on the leading platforms. On the other, it may increase dependence on a handful of operators at a time when policy and compliance questions remain unsettled.
The two leaders are not identical in focus. Polymarket is described as drawing much of its volume from politics, followed by crypto, sports, and global events. Kalshi, meanwhile, shows stronger activity in economics, financials, and politics, while also supporting more niche categories such as climate, weather, and transportation. Those differences suggest the platforms are serving overlapping but distinct audiences, with Polymarket leaning into headline-driven narratives and Kalshi maintaining a broader event-contract footprint.
Transactions Surged to 207 Million in March
Trading volume was not the only metric that accelerated. Dune’s figures show prediction markets logged approximately 207 million transactions in March, a sharp increase from 155 million in February. That month-over-month jump indicates not just larger wager sizes or isolated institutional flow, but expanding user engagement across the sector.
Again, the bulk of activity was concentrated in the same two leaders. Polymarket recorded 115 million transfers during March, while Kalshi posted 88 million. The scale of those numbers points to deepening user adoption and a market structure in which traders repeatedly return to the same venues to express views on real-world outcomes.
High transaction counts can also be interpreted as a sign of improving platform stickiness. In prediction markets, user retention often depends on a constant supply of new questions tied to evolving news cycles. Politics, macroeconomics, sports, and crypto all provide recurring catalysts, helping leading platforms maintain engagement as old contracts settle and new ones emerge.
Open Interest Nears $940 Million
At the time of writing, the combined prediction market sector held about $939.86 million in open interest. Here too, Kalshi and Polymarket dominated. Kalshi led with $487.21 million, while Polymarket held $422.09 million. Together, the two platforms represented the overwhelming majority of open positions across the tracked ecosystem.
Smaller venues remained far behind. Predict.fun accounted for roughly $19.51 million in open interest, and Opinion held around $10.38 million. Limitless was much smaller at approximately $666,520, while the remaining venues collectively contributed just $3,760. These figures reinforce the picture of a market where liquidity is not merely unevenly distributed, but overwhelmingly concentrated at the top.
That concentration matters because open interest is a useful proxy for committed capital and ongoing conviction. The fact that nearly all of it sits on two platforms suggests that, despite the presence of multiple operators, traders still view Kalshi and Polymarket as the primary venues for meaningful exposure.
Growth Continues Despite Regulatory Scrutiny
The latest growth has come alongside mounting political and regulatory pressure. The report notes that controversy has surrounded some markets tied to the U.S.-Iran conflict, highlighting the reputational and ethical questions that can arise when platforms allow users to speculate on sensitive geopolitical events. At the same time, Democratic lawmakers in the United States have largely taken a critical stance toward prediction markets and have advanced legislation aimed at tightening oversight.
Regulatory friction is not limited to Congress. The two dominant platforms are also navigating state-level rules that may conflict with federal guidance, particularly in relation to the Commodity Futures Trading Commission (CFTC). That tension creates a complicated operating environment, especially for platforms attempting to scale mainstream user adoption while remaining within shifting legal boundaries.
Even with those headwinds, the data suggests traders have not stepped back. Notional volume remains elevated, transaction counts are climbing, and open interest continues to build on the top platforms. In practical terms, that means the market has so far proven resilient to criticism, uncertainty, and the prospect of future enforcement or rule changes.
A Durable Niche Is Becoming More Established
The broader significance of March’s figures is that prediction markets are increasingly behaving like a durable market category rather than an episodic trend. January, February, and March all posted exceptionally strong totals, and April was already adding to the cumulative tally before the month had finished. Such consistency suggests that users are returning to these platforms not just for one election cycle or one macro event, but as an ongoing mechanism for expressing probabilistic views.
Whether this momentum can be sustained remains uncertain. Regulation may intensify, political opposition could sharpen, and market concentration could itself become a risk factor if users or policymakers focus on the dominance of a few platforms. Still, the current numbers are difficult to ignore. With $25.7 billion in March volume, 207 million monthly transactions, and nearly $940 million in open interest, prediction markets have established themselves as a significant force at the intersection of finance, technology, and public-event speculation.
For now, Polymarket and Kalshi remain the central story. They are not only setting the pace for volume and engagement, but also defining how the sector is perceived by users, regulators, and the broader market. As long as those platforms continue to attract liquidity at this scale, prediction markets are likely to remain one of the most closely watched corners of the digital asset and event-trading landscape.