Infiniti Intelligence Hourly Briefing — Oct 15, 2026 · 5:09 AM ET

Polymarket’s rolling volume declines

Polymarket recorded $4.5B in contract trading over Sep 15-Oct 14, 2026, according to defirate.com. That was down 8% from the preceding 30-day period.

The platform represented 5% of prediction-market volume in the snapshot. Kalshi held 76%, leaving a substantial gap between the two platforms’ shares of reported activity.

Two measures of trading activity

Defirate.com also reported $2.3B in dollars paid for Polymarket over the same period. That figure is distinct from the $4.5B contract-volume measure; the two should not be treated as interchangeable.

The figures describe a rolling 30-day window, rather than a single day’s activity. They establish a decline in Polymarket’s reported volume, but the supplied data do not explain what drove it or show how its market share changed from the previous period.

What it means for prediction markets

• Platform activity is unevenly distributed: Polymarket’s 5% share contrasts with Kalshi’s 76%, making the venue important context when assessing overall market activity.
• Metric definitions matter: The $4.5B in contracts and $2.3B in dollars paid describe different measures, so comparisons require a consistent basis.
• The decline has limits as a signal: The 8% drop measures Polymarket’s volume change, not a shift in event probabilities or evidence of weaker liquidity in any particular contract.

The Counter-Strike matchup between MIBR and BC.Game Esports generated $174K in 24-hour trading volume on Polymarket, with MIBR priced at 56%, according to polydict.app’s Oct. 15 snapshot at 08:25 AM UTC. The market ranked 35th on the board by that volume measure.

A modest favorite in Group D

The best-of-three match is part of Stake Pulse Beat III Group D. The listing gives the market an end date of Oct 15, 2026, putting it among the board’s contracts scheduled to end that day.

MIBR’s 56% reading indicates a modest market-implied advantage, rather than a decisive favorite. The supplied snapshot contains no price history, so it does not establish whether sentiment had shifted toward MIBR or away from it.

Esports activity across the board

Other esports matches attracted more turnover in the same snapshot. According to polydict.app, the Counter-Strike best-of-three between Aurora Gaming and NIP in Thunderpick World Championship Group A ranked 22nd, with $353K in 24-hour volume and Aurora Gaming at 71%.

The League of Legends best-of-five between Team WE and HANJIN BRION in the Demacia Cup Global Invitational Playoffs ranked 14th, drawing $541K with HANJIN BRION at 56%. Both that market and the Aurora Gaming–NIP listing had end dates of Oct 15, 2026.

MIBR–BC.Game Esports sat immediately above the EPL: 2027 Champion market, which recorded $173K, and below Democratic Presidential Nominee 2028, at $194K. That placement measures relative trading activity, not the strength of the forecast or the amount available to trade at a particular price.

What it means for prediction markets

• Price and volume tell different stories: MIBR’s 56% reflects the displayed probability, while $174K measures turnover over 24 hours.
• The reading is time-specific: The figures describe the Oct. 15, 08:25 AM UTC snapshot, not a subsequent price or match result.
• Settlement rules remain central: According to polydict.app, these markets use Polymarket’s order book and contracts, with outcomes determined under Polymarket’s stated rules and resolution sources.