The probability that the US will announce a blockade on Iran by December 31 surged by 22.0 percentage points over 24 hours, climbing from 37.0% to 59.0% on Polymarket’s Breaking feed. This rapid repricing was accompanied by whale investors increasing their net exposure by $27K into YES contracts, with $42K bought and $16K sold across 114 unique whales in the same period.
Polymarket recorded $43K in total 24-hour trading volume, nearly matching whale buy volume alone and contributing to a lifetime market volume of $392K. The market’s 603 unique traders reflect a broad participant base engaged with this geopolitical scenario.
Whale flow moved in alignment with the price increase, indicating that large investors supported the shift higher rather than opposing it. However, a notable divergence exists between Polymarket’s Breaking YES price at 59.0% and the Polydata on-chain midpoint at 25.5%, suggesting some discrepancy between different data sources.
This combined price and flow picture signals that the market is currently digesting new information or sentiment that sharply raises the chance of a US blockade announcement, with whales reinforcing this view through sizeable buying activity. The alignment of tape and whale flow strengthens the conviction behind the move, marking a significant shift in market perception within a single day.
| Market | Will the US announce a blockade on Iran by December 31? |
|---|---|
| Market ID | 2643406 |
| 24h price change | +22.0 pp |
| YES now (PM Breaking) | 59.0% |
| YES ~24h ago (est.) | 37.0% |
| YES (Polydata overview) | 25.5% |
| Whale net flow (24h) | $27K |
| Whale buy / sell (24h) | $42K / $16K |
| Unique whales (24h) | 114 |
| Volume 24h (PM) | $43K |
| Unique traders (Polydata) | 603 |
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.