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Prediction market volume reaches $5.5 billion as Democratic Senate odds rise

DeFi Rate's October 31 tracker put 24-hour volume at 5.5 billion dollars across nine prediction market exchanges, up from the 4.6 billion dollars it reported earlier the same day. The same board showed Senate control for Democrats up 5 points in seven days to about 71 percent across Kalshi and Polymarket.

DeFi Rate’s October 31, 2026 tracker showed $5.5 billion in trading volume over 24 hours across nine prediction market exchanges. That exceeded the $4.6 billion figure the outlet had reported earlier the same day.

The two readings represent a $900 million increase in reported volume. They are snapshots of 24-hour activity, rather than a measure of trading solely between the updates.

Democratic Senate pricing moves higher

The same DeFi Rate board put the probability of Democrats controlling the Senate at about 71 percent across Kalshi and Polymarket. That was up 5 percentage points over seven days.

The figures describe two separate developments: higher reported trading activity across nine exchanges and a weeklong shift in Senate-control pricing across Kalshi and Polymarket. The supplied summary does not establish how much Senate trading contributed to the overall volume.

What it means for prediction markets

  • Volume coverage matters: The $5.5 billion reading spans nine exchanges; it should not be treated as turnover for either Kalshi or Polymarket alone.
  • The timeframes differ: Volume covers 24 hours, while the 5-point change in Democratic Senate-control probability covers seven days.
  • Pricing is not an outcome: The roughly 71 percent reading reflects market expectations, not a confirmed result.
KalshiPolymarketSenateInfiniti MarketsInfiniti Signals

Sources & attribution

Published
  1. Source
    DeFi Ratedefirate.com
    Publisher
    https://defirate.com
    Source URL
    The feed did not publish this story's article address.

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