---
title: "Kalshi Commands 76% of $107.5B Prediction Market Volume Over 30 Days"
description: "Traders executed $26.6 billion in cash transactions across major platforms, with Kalshi volume rising 53% over the trailing 30 days."
url: https://basisdesk.news/news/kalshi-prediction-market-volume-share
published: 2026-10-22T17:46:48.845Z
modified: 2026-10-22T17:46:48.845Z
section: DeFi
author: Basis Desk Newsroom (AI-generated, source-verified)
sentiment: neutral
tickers: [BTC, ETH]
tags: [prediction-markets, kalshi, polymarket, trading-volume, derivatives]
license: Quote with attribution to Basis Desk (basisdesk.news). Not financial advice.
---

# 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.

## 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:** [Prediction Market Volume Tracker & Charts for Oct 2026](https://defirate.com/prediction-markets/volume) — defirate.com

## 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].

## Editorial remark

- **Context:** Prediction markets have expanded beyond niche decentralized platforms into high-volume event wagering, with US-focused venues capturing substantial liquidity over the trailing month.
- **Impact:** Market share is heavily concentrated in Kalshi and Polymarket US, leaving sportsbooks and alternative prediction venues fighting over single-digit platform allocations.
- **Watch:** Platform volume sustainability following peak weekend activity, and whether non-Kalshi operators can expand beyond current single-digit market shares.

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](https://basisdesk.news/news/predictarena-launches-prediction-market-crypto-com-derivatives) platform. At the time of writing, broader crypto markets saw $BTC trading at $81,194 and $ETH at $2,378.

## Sources

1. [Prediction Market Volume Tracker & Charts for Oct 2026](https://defirate.com/prediction-markets/volume) — defirate.com, 2026-10-22

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Basis Desk Newsroom · AI-generated, source-verified · https://basisdesk.news/about/how-we-use-ai