News categoryVolume Report

Texas political markets have reached $24.2 million of trading volume on Kalshi, but less than $200K in open interest separates Paxton from Cornyn.

Aaron Rai won his first major despite modest backing in Kalshi's heavily traded PGA Championship markets, where most volume came during the tournament.

Kalshi's weekly volume dipped only slightly even as its trade count fell sharply, pointing to larger trades, while Polymarket US rebounded on a busy sports slate.

Kalshi hit a record $4.13B in weekly notional volume, up 8.5% WoW, while Polymarket fell 6.2% to $1.60B. Kalshi now holds 72.1% of combined volume.

UFC 328 was one of Kalshi's biggest fight nights, and most of the cash traded backed Khamzat Chimaev, who lost a split decision to Sean Strickland.

Kalshi set a monthly volume record in April while Polymarket's volume fell, as Kalshi's sports-heavy mix held up without the Super Bowl or March Madness.

Kalshi set a weekly volume record and passed Polymarket in transaction count, with parlays reaching a record share, while Polymarket's volume barely rose.

Kalshi and Polymarket volume fell from Masters week records on a lighter calendar, with Kalshi drawing fewer, larger bets and Polymarket more, smaller ones.

The Masters set a golf trading record on Kalshi and Polymarket's Trump and politics markets surged, pushing combined industry volume to a new weekly high.

Both platforms hit March records, then diverged: Kalshi rose 6.4% in the week of March 30 while Polymarket fell 12%, widening Kalshi’s notional volume lead to $932M.

Kalshi set a monthly volume record in March with days still to go, while Polymarket passed ten billion dollars in a month for the first time on March Madness trading.

Kalshi posted a new record $3.40 billion notional volume week as Polymarket’s sports volume surged 32% week over week with NCAA basketball tournaments in full swing.

Kalshi posted a new volume record for the week of March 9-15, surging to $2.9B on the back of NCAAB conference tournaments. Meanwhile, Polymarket dipped 6% ahead of the March fed meeting.

Kalshi and Polymarket had their biggest combined week on record as Polymarket passed a billion dollars in weekly sports volume for the first time.

Both Kalshi ($9.93B) and Polymarket ($7.94B) posted MoM increases of nearly 4% in February. Meanwhile, Polymarket volume surged 32% WoW with help from Khamenei markets to close the gap on Kalshi.

We found average hit rate, historical trends, and what two experts have to say about Trump mention markets heading into the State of the Union address.

Weekly notional volume across prediction market platforms dipped 1.4% to $5.25 billion for Feb. 16–22. Kalshi jumped 6.7% to $2.59 billion as Polymarket slid 3.2% WoW to $1.83 billion.

Opinion onchain prediction exchange hit $8.08B in January volume for 31% market share. But 13–25x larger trades, sharp user swings, and structural incentives point to inflated trading data.

Fed economists find Kalshi’s macro markets to be helpful complementary real-time forecasting tools, as CEPR research highlights pricing bias concerns that require careful interpretation.

Weekly volume fell after the Super Bowl spike, yet industry volume has grown sharply over six months, with Kalshi leading in sports and Polymarket in non-sports markets.