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DeFi · 1 min read

Kalshi Commands 76% of $107.5B Prediction Market Volume Over 30 Days

Traders executed $26.6 billion in cash transactions across major platforms, with Kalshi volume rising 53% over the trailing 30 days.

Editorial oversight: Julian Mercer, Chief Editor
Neutral
$BTC $81,094 −4.2% $ETH $2,378 −5.6%

At a glance

What happened
Prediction market venues traded $107.5 billion in contract face value across 30 days, with Kalshi accounting for 76% of total activity, according to DeFi Rate.
Why it matters
The concentration of $26.6 billion in cash transactions highlights the rapid liquidity shift toward dominant event-contract exchanges over emerging competitors.
Who is affected
Prediction market operators, platform liquidity providers, and event traders on Kalshi, Polymarket, and sports-betting hybrids.
What's next
No next step announced.
Primary source
defirate.com: Prediction Market Volume Tracker & Charts for Oct 2026

Key points

  • Prediction market trading hit $107.5 billion in contract face value and $26.6 billion in cash paid over a 30-day window 1.
  • Kalshi dominated market share at 76%, increasing its volume by 53% relative to the prior 30 days 1.
  • Polymarket US and Polymarket accounted for 12% and 4% of total volume, respectively, followed by DraftKings Predictions at 3% 1.

Prediction market venues generated $107.5 billion in contract face value over a 30-day span ending in October 2026, according to data tracker DeFi Rate 1. Kalshi captured 76% of that activity after experiencing a 53% jump in trading volume compared to the previous 30-day stretch 1.

Across tracked venues—including DraftKings Predictions, Gemini, Kalshi, Novig, Polymarket, Polymarket US, ProphetX, Rothera, and Underdog Exchange—total cash paid for contracts reached $26.6 billion, with $3.9 billion traded in a single 24-hour period 1. Polymarket US ranked as the second-largest venue by market share at 12%, followed by Polymarket's international platform at 4% and DraftKings Predictions at 3% 1. Novig accounted for 2%, while Rothera, Underdog Exchange, ProphetX, and Gemini each cleared 1% or less of overall contract volume 1.

Platform Activity and Daily Flow

Daily metrics from Sept. 22 through Oct. 21, 2026, reveal recurring weekend spikes across several exchanges 1. On Oct. 18, total Kalshi contract volume peaked at $4.5 billion, while Polymarket US registered $645 million, DraftKings Predictions cleared $340 million, and Novig handled $207 million 1. The most heavily traded single contract over the trailing 24 hours reached $16 million on Kalshi, closely followed by a sports match between Bayern Munich and Arsenal at $13 million 1.

The figures illustrate an accelerating shift toward regulated and domestic prediction exchanges, alongside the rise of competing services such as the recently launched PredictArena platform. At the time of writing, broader crypto markets saw $BTC trading at $81,194 and $ETH at $2,378.

Sources

  1. [1] Prediction Market Volume Tracker & Charts for Oct 2026 — defirate.com, October 22, 2026

Written by Basis Desk's newsroom system from the primary sources above and machine-verified against them before publication. Market figures marked "at the time of writing" come from live exchange data. Report an error: corrections@basisdesk.news · corrections policy.

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