The probability that the US will announce a blockade on Iran by July 31 fell sharply by 23.0 percentage points in the last 24 hours, dropping from an estimated 53.0% to 30.0% on Polymarket.
This notable decline in market odds came despite significant whale activity supporting the YES side. Over the same period, whales contributed a net flow of $144K into YES contracts, with buy volume totaling $259K against $115K in sells. This divergence between price movement and whale flow is unusual and signals a complex market dynamic.
In total, 266 unique whales participated in trading YES contracts within 24 hours, contributing to a Polymarket volume of $224K for this market segment. Since inception, the market has seen $1.11M in total volume with 1,068 unique traders involved.
The sharp drop in YES price alongside strong whale buying suggests that while smaller traders or the broader market are pricing in reduced chances of a blockade announcement, whales are accumulating YES positions, potentially anticipating a different outcome or reacting to separate information flows. This split between tape direction and whale flow highlights the nuanced and sometimes conflicting signals within prediction markets.
Overall, the combination of a steep price decline paired with substantial whale buying activity indicates a contested market view on this geopolitical event, emphasizing the importance of watching both price action and large trader behavior for a fuller understanding of market sentiment.
| Market | Will the US announce a blockade on Iran by July 31? |
|---|---|
| Market ID | 2643405 |
| 24h price change | +23.0 pp |
| YES now (PM Breaking) | 30.0% |
| YES ~24h ago (est.) | 53.0% |
| YES (Polydata overview) | 25.5% |
| Whale net flow (24h) | $144K |
| Whale buy / sell (24h) | $259K / $115K |
| Unique whales (24h) | 266 |
| Volume 24h (PM) | $224K |
| Unique traders (Polydata) | 1,068 |
Source: Polydata API v3 · /whales/flow + Polymarket Breaking · snapshot 2026-07-13. Data: Polydata API v3. On-chain figures are public. Realized PnL is computed over resolved markets only and excludes open positions, so it is conservative versus the Polymarket UI. This is not investment advice.