The probability that the US will announce a blockade on Iran by August 31 surged by 24.0 percentage points over the past 24 hours, climbing from an estimated 31.5% to 55.5% on Polymarket’s Breaking feed as of July 12, 2026. This sizable repricing reflects a significant shift in market sentiment toward the likelihood of a blockade being announced within the timeframe.
Whale activity aligned with this price move, with a net inflow of $24K into YES contracts during the same period. Whale buy volume totaled $44K against $20K in sells, spread across 99 unique whales, indicating broad participation from large traders reinforcing the upward momentum. The total 24-hour volume on this market reached $53K, contributing to a lifetime market volume of $122K and involving 232 unique traders overall.
It is notable that the Polymarket Breaking YES price at 55.5% contrasts with the Polydata on-chain mid-price of 35.5%, suggesting a divergence between real-time market sentiment and on-chain valuation metrics. However, the whale flow and price move on Polymarket Breaking are in clear alignment, reinforcing the recent surge in probability.
This combined trend of rising odds and strong whale buying signals a marked increase in market conviction that the US will announce a blockade on Iran by the end of August 2026, marking a critical development in geopolitical risk pricing on prediction markets.
| Market | Will the US announce a blockade on Iran by August 31? |
|---|---|
| Market ID | 2821347 |
| 24h price change | +24.0 pp |
| YES now (PM Breaking) | 55.5% |
| YES ~24h ago (est.) | 31.5% |
| YES (Polydata overview) | 35.5% |
| Whale net flow (24h) | $24K |
| Whale buy / sell (24h) | $44K / $20K |
| Unique whales (24h) | 99 |
| Volume 24h (PM) | $53K |
| Unique traders (Polydata) | 232 |
Source: Polydata API v3 · /whales/flow + Polymarket Breaking · snapshot 2026-07-12. 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.