Polymarket US traded $11.6B in the 30 days to Oct. 14, up 139% on the prior 30 days, for a 12% share

Polymarket US volume rises 139%

Polymarket US recorded $11.6B in contract trading during Sep 15-Oct 14, 2026, according to defirate.com. That was up 139% from the preceding 30-day period.

The venue accounted for 12% of prediction-market volume over the same window, according to defirate.com. The snapshot places its recent trading activity alongside its share of the broader market.

Contract volume and dollars paid

Defirate.com separately reported $3.3B in dollars paid for Sep 15-Oct 14, 2026. That measure is distinct from the $11.6B contract-volume figure; the two should not be treated as interchangeable.

The figures establish a sharp increase in contract trading, but the supplied data do not break down activity by contract or explain what drove the growth. They also provide no prior-period market-share figure with which to compare the reported 12%.

What it means for prediction markets

• Activity increased substantially: The 139% rise measures contract-volume growth against the previous 30 days, not a change in market share.
• Metric choice matters: The $11.6B in contracts and $3.3B in dollars paid describe different measures of activity.
• The snapshot has limits: A 12% volume share shows Polymarket US’s position during this window, but does not by itself establish gains in share or liquidity in individual markets.