TLDR
- Kalshi and Polymarket’s combined lifetime trading volume crossed $150 billion in April
- Kalshi hit a record $14.81 billion in April volume, up 13.3% month-over-month
- Polymarket’s volume dropped 14.8% to $9.01 billion, widening Kalshi’s lead to $5.8 billion
- Polymarket’s active traders fell from 733,000 in March to 643,000 in April
- Sports and parlay-style “Exotics” contracts now make up around 85% of Kalshi’s activity
Prediction markets Kalshi and Polymarket crossed a combined lifetime trading volume of $150 billion in April. The milestone came even as the sector recorded its first monthly decline in total trading activity after seven straight months of record-breaking growth.
April Trading Data
1. Kalshi weekly volume: $3.91B for the week of April 26 (+27.8% WoW), an ATH. Prior week $3.06B; Masters week $3.5B.
2. Polymarket same week: $1.96B (+4% WoW). Kalshi's lead widened to ~$2B, the largest recent gap.
3. Kalshi sports: $3.0B/week, 76.7% of… pic.twitter.com/Ji6pD7kYZ5— OKX Ventures (@OKX_Ventures) April 29, 2026
Kalshi drove the headline number, posting $14.81 billion in notional trading volume for April. That was a 13.3% increase over its previous record of $13.07 billion set in March.
What made that number stand out was the calendar. April had no Super Bowl, no March Madness, and no NFL playoffs. It did have the NBA and NHL playoffs starting, The Masters golf tournament, and the start of the MLB season.
The Masters alone generated $545 million in notional volume on Kalshi — matching the platform’s Super Bowl game-only volume of $545.1 million.
Polymarket moved in the opposite direction. Its notional volume fell 14.8%, from $10.57 billion in March to $9.01 billion in April. That pushed Kalshi’s monthly lead over Polymarket to $5.8 billion, more than double the $2.5 billion gap seen in March.
Sports and Exotics Drive Kalshi’s Growth
Sports contracts made up 74.3% of Kalshi’s weekly volume in the week of April 20. When combined with Exotics — the platform’s parlay-style combo contracts — that figure reached around 85%.
Exotics are growing fast. In the week of April 20, they accounted for $412.5 million, or about 10.6% of Kalshi’s total weekly volume, up from 8.7% the week before.
Kalshi’s taker volume in April was $5.42 billion compared to Polymarket’s $1.99 billion. Kalshi also processed more transactions — 94.4 million to Polymarket’s 87.4 million — flipping a long-running trend where Polymarket had led on transaction count.
Polymarket’s Broader Mix Cuts Both Ways
Polymarket’s category split is different from Kalshi’s. In the week of April 20, sports led at 46%, but crypto accounted for 22% and politics-related markets added another 27%.
That mix benefits Polymarket when crypto sentiment is strong or a major political event hits. But when both are quiet — as they were for stretches of April — there is no sports-heavy base to fall back on.
Polymarket’s active trader count dropped from over 733,000 in March to about 643,000 in April. The decline suggests some of March’s activity was tied to March Madness, with April reflecting a more typical user base.
On the regulatory side, Polymarket is reportedly looking to bring its global marketplace into the U.S. after acquiring a CFTC-licensed derivatives exchange. Kalshi raised capital in March at a $22 billion valuation. Polymarket is reportedly seeking to raise at a $15 billion valuation.
Nine months ago, the prediction market sector was processing around $2 billion per month. In April 2026, combined monthly volume across the two platforms reached approximately $28 billion.
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