Hourly Briefing ·
2 stories in this edition: Democrats hold 218 or more seats in the House after the 2026 midterms AND hold 49 or more seats in the Senate after the 2026 midterms priced at 80.0% on Kalshi, down 4.0 points, on $2.8M traded · Anthropic have the best AI model at the end of December 2026 priced at 55.5% on Polymarket, up 2.0 points, on $441K traded
PredictionBubbles' movers board, unchanged on its Oct. 28, 10:33 UTC read, lists the combined House-and-Senate seat-threshold contract among its downward political…
No significant new platform headline in the last 30 minutes; news search recirculated only items already used today, taken by website-only batches, or on the banned list…
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A Kalshi contract requiring Democrats to finish the 2026 midterms with at least 218 House seats and at least 49 Senate seats was priced at 80.0%, down 4.0 probability points, with $2.8M traded, according to the supplied Oct. 28 market update.
The combined seat-threshold contract appeared among declining political markets on PredictionBubbles’ movers board. The accompanying summary describes the board as unchanged at its Oct. 28, 10:33 UTC reading.
The contract concerns both thresholds being met. Its 80.0% price therefore represents the market-implied probability of that combined result, rather than a separate estimate for either Democrats’ House performance or their Senate performance.
The supplied material does not identify a poll, campaign development or other specific catalyst for the decline. Nor does it provide separate chamber-level prices that would show which part of the combined outcome drove the repricing.
According to PredictionBubbles, its movers rankings measure changes over 24 hours in probability points, rather than relative percentages. The service draws prices from Kalshi and Polymarket and updates every 15 minutes; the supplied source page carries a later venue-reading timestamp of 28 Oct 2026, 11:04 UTC.
PredictionBubbles ranks markets by the size of their probability changes, without adjusting those rankings for volume or liquidity. The $2.8M traded figure adds context to this contract’s move, but the supplied material does not establish its order-book depth or how much trading directly accompanied the decline.
Polymarket priced Anthropic’s chance of having the best AI model at the end of December 2026 at 55.5%, up 2.0 percentage points, with $441K traded, in the supplied market snapshot published Oct 28, 2026, at 7:24 AM ET.
The price puts the outcome above even odds, but the supplied material does not identify a fresh development behind the increase. The accompanying news-search summary reported no significant new platform headline in the preceding 30 minutes.
That search returned only material already used today, assigned to website-only batches, or included on a banned list. This limits the available explanation for the move; it does not establish that no relevant news occurred.
According to predictionbubbles.net, its technology-market board reports probability changes over the last 24 hours and refreshes data every 15 minutes. The 2.0-point increase should therefore be distinguished from the much shorter news-search window.
PredictionBubbles says it aggregates prices from Polymarket and Kalshi, tracking 60 open technology markets: 13 on Kalshi and 47 on Polymarket. It reports total traded volume separately from probability movement, so the $441K figure should not be read as the amount traded during this increase.
The supplied material does not include the Anthropic contract’s detailed resolution criteria or explain how “best” will be determined. According to predictionbubbles.net, related questions across venues can have different wording and settlement rules, making those details important when interpreting or comparing prices.