The prediction market industry keeps breaking its own records, and each time the question is the same: is this another spike, or has something fundamentally shifted?
The week of April 6–11 offers the clearest answer yet. Combined notional volume across tracked platforms hit $6.5 billion — an all-time high, according to DeFi Rate's prediction markets dashboard — surpassing the prior record of $5.94 billion set during March Madness. (DeFi Rate)
But the volume is almost secondary to what drove it. Kalshi's $3.54 billion (+21.8% WoW) was anchored by the Masters Tournament and sustained sports volume. Polymarket's $2.48 billion (+25.5% WoW) was driven by US-Iran conflict markets and long-horizon 2028 election positioning. These are different categories, different user bases, different time horizons — and both platforms are doing them simultaneously at scale.
The baseline has changed
For most of prediction markets' history, volume was event-driven: spike during elections, collapse after. The 2024 US election cycle produced extraordinary numbers, and skeptics argued the sector would revert to baseline once the cycle ended.
The data disagrees. Kalshi hit $13.07 billion in March. Polymarket reached $10.57 billion. These are monthly baselines — not peak weeks — in what is ostensibly a low-event period between election cycles.
On Polymarket, average trade size grew 27.5% week-over-week to $110.77, while transaction count was essentially flat. The volume gain came from larger positions, not more participants — a signal that more sophisticated capital is using these platforms as a macro positioning tool rather than retail speculation.
On Kalshi, average trade size reached approximately $160 per transaction, up 10% — reflecting high-conviction sports positioning and larger crypto and political positions. The transaction divergence between platforms (Kalshi at 22.2M transactions vs Polymarket at 22.3M, yet Kalshi's volume is $1B higher) shows that regulated, sports-anchored markets are attracting bigger tickets than crypto-political markets onchain.
Geopolitical permanence
The US-Iran conflict markets illustrate the new scope. The "US forces enter Iran by..?" market has drawn $367 million in total volume since January. The "US x Iran ceasefire by...?" market has drawn $280 million since late February. Bloomberg reported that combined US-Iran conflict markets have channeled more than $170 million through Polymarket — one of the largest geopolitical wagers in the category's short history.
What's notable isn't the volume but the durability. These markets sustained activity across weeks of escalating rhetoric, ceasefire negotiations, and reversals — not a single crystallizing event. Polymarket's Trump category surged 141% week-over-week to $488.3 million. Combined with broader Politics at $354.2 million, the Trump and Politics complex hit $842.5 million — representing 34% of all Polymarket volume for the week.
Geopolitical probability markets appear to have found a user base that treats them as an information tool, not just a betting product. That shift, if durable, expands the addressable market well beyond election cycles.
Institutional scaffolding
The infrastructure story is also changing. In October 2025, ICE/NYSE, parent of the New York Stock Exchange, announced a strategic investment of up to $2 billion in Polymarket at an $8 billion valuation. Bank of America's research now estimates Kalshi commands approximately 89% of the US regulated prediction market — a concentration that suggests the CFTC-regulated path has won, at least for now. BofA's report also estimated sports event contracts could eventually generate $1.1 trillion in annual volume , translating to roughly $10 billion in annualized revenue at typical fee levels.
The compliance map remains messy. Arizona filed criminal charges against Kalshi in March; Nevada regulators have sued. The Trump administration has sued multiple states over their attempts to regulate prediction markets. But the direction of travel — toward federal preemption and CFTC oversight — appears established, even if contested.
The open question
The Guardian reported that a group of newly created accounts placed well-timed bets on the US-Iran ceasefire market, generating hundreds of thousands of dollars in profits — with one wallet turning roughly $72,000 into $200,000 in hours. The pattern of newly created accounts with strategic, well-timed positions has appeared before on Polymarket (including before the January capture of Venezuelan president Nicolás Maduro), and the platform has not publicly addressed the specifics. Bloomberg has reported on the episode .
For institutional participants considering prediction markets as a positioning tool, information integrity is a live concern. For the industry, it's a governance challenge that grows with scale.
The $6.5 billion week is real. The structural question — whether prediction markets have permanently expanded their addressable market — is the more consequential one. The early evidence says yes. The infrastructure is catching up.
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