Prediction-market universe totals 2,134 open markets and $6.01B traded on PredictionBubbles' live board

PredictionBubbles’ live-board snapshot lists 2,134 open markets across Kalshi and Polymarket, with $6.01B in traded volume, as of Oct 16, 2026, at 8:09 AM ET. The figures describe the markets tracked by the service, rather than a count of every prediction market available elsewhere.

What the board measures

According to PredictionBubbles, its coverage spans 9 categories, with prices updated every 15 minutes. The embedded visualization displays the 300 largest markets by volume, while the full board covers all 2,134. Bubble size represents trading volume; color indicates market-implied probability.

The distinction between turnover and current exposure matters. PredictionBubbles defines volume as cumulative trading, rather than money presently committed to positions. Open interest measures positions still outstanding, while liquidity refers to orders currently available. The $6.01B headline figure should therefore not be read as 24-hour turnover or funds currently at stake.

Rates illustrate the cross-platform view

The board’s October 2026 Federal Reserve contracts show how related questions appear across venues. According to PredictionBubbles, Polymarket priced no change after the meeting at 86.5% and a 25 bps increase at 13.5%. Kalshi’s contracts for a 0bps hike and a 25bps hike stood at 86.0% and 12.0%, respectively. Those readings show differences between related contracts, not evidence on their own that the contracts have identical settlement terms.

The service separates trading scale from price movement. Its daily movers are ranked by absolute changes in probability points over the last 24 hours, excluding markets without valid change data. Its activity-ranking score runs from 0 to 100 and emphasizes trading pace relative to each market’s own baseline, followed by probability movement, with a small additional weight for approaching deadlines.

PredictionBubbles says that score is a discovery tool, not an outcome forecast or a measure of potential profitability. The site also describes itself as an information service: it displays venue prices but does not accept wagers, hold funds or provide accounts.

What it means for prediction markets

• Coverage has boundaries: The 2,134-market total reflects PredictionBubbles’ Kalshi and Polymarket coverage, not an independently established industry-wide total.
• Volume is not conviction: Cumulative trading, available liquidity and outstanding positions measure different aspects of a market.
• Activity is not direction: A high activity score identifies unusual trading and repricing, without indicating which outcome will prevail.
• Prices need context: The 15-minute refresh schedule and each contract’s resolution rules matter when interpreting probabilities or comparing venues.