US x Iran ceasefire continues through October 31 priced at 81.5% on Polymarket, up 4 points, on $3.8M traded

The Polymarket contract on whether the US–Iran ceasefire continues through October 31 was priced at 81.5%, up 4 probability points, with $3.8M traded, in the update published Oct 17, 2026 · 11:54 PM ET. According to PredictionBubbles’ movers board, the contract was among the day’s political-market moves.

What the move captures

The increase represents a higher market-implied probability of ceasefire continuation, rather than confirmation of a diplomatic development. The supplied material does not identify a news event behind the repricing or provide the contract’s detailed settlement criteria.

According to PredictionBubbles, its board measures changes over 24 hours and updates every 15 minutes using prices from Polymarket and Kalshi. The supplied page records its venue-price snapshot as 18 Oct 2026, 03:45 UTC.

Reading the board

PredictionBubbles ranks markets by the size of their probability-point change, regardless of direction. Trading volume and liquidity provide context but do not affect that ranking. The ceasefire contract’s 4-point increase therefore describes a shift in pricing—not a 4% relative gain.

The board’s comparison covers 2,027 markets with lifespans longer than 14 days, excluding short-lived fixtures. Its displayed table contains the top 150 of 426 markets moving at least one probability point. Only open contracts with a valid 24-hour comparison qualify.

The reported $3.8M traded adds a separate measure of activity. However, the supplied ceasefire figures do not specify that volume’s measurement period or show order-book depth, limiting conclusions about how much trading directly supported the latest move.

What it means for prediction markets

• Continuation remains the favored outcome: The 81.5% price reflects traders’ assessment of the October 31 question, not a guarantee that the ceasefire will hold.
• Price movement and its cause are separate: The 4-point rise establishes repricing; the supplied reporting does not establish a diplomatic catalyst.
• Volume is context, not proof: The $3.8M figure alone cannot establish liquidity or explain the move.
• Settlement terms matter: Without the contract’s detailed rules, the material does not establish exactly what would count as ceasefire continuation or a breach.