Polymarket leads in volume while Kalshi lists more open questions

The supplied snapshot, published Nov 1, 2026 · 9:54 AM ET, puts Polymarket ahead of Kalshi in volume but behind it in the number of open questions, according to Predictions.io.

Volume and question counts diverge

Polymarket accounts for $6.3B in volume across 2,932 open questions. Kalshi has $2.3B in volume across 6,455 open questions. The figures distinguish trading activity from the size of each platform’s question inventory.

Predictions.io also tracks 1,670 validated question matches between Polymarket and Kalshi. That count identifies a set of questions for cross-platform comparison, though the supplied material does not include individual contracts, prices or settlement terms.

The accompanying summary says no significant new prediction-platform headline emerged in the preceding 30 minutes. It describes search results as recirculating material already used or held back that day; no source links or full source text were provided.

What it means for prediction markets

• Volume and breadth point in different directions: Polymarket’s larger volume total does not translate into a larger inventory of open questions.
• Matched questions provide a comparison set: The 1,670 validated matches are relevant to cross-platform analysis, but the count alone does not establish price differences or identical settlement conditions.
• The snapshot has limits: Without contract-level details or a stated volume measurement period, these totals cannot establish current liquidity or changes in trading activity.