The probability of a US and Iran diplomatic meeting by July 31, 2026, declined sharply on Polymarket, with the YES contract price dropping 22.0 percentage points from 61.0% to 39.0% over the past 24 hours. This represents a significant shift in market sentiment within a single day.
Contrary to the price move, whale investors increased their exposure to YES contracts, registering a net inflow of $43K. Whale buy volume totaled $76K, while sell volume was $33K across 120 unique whale wallets. This divergence between whale flow and price movement is notable, as typically large traders’ actions align with price trends.
The total 24-hour volume on the market was $63K, a figure surpassed by whale activity alone, indicating whales dominated recent trading. The market’s lifetime volume stands at $603K with 986 unique traders participating since inception.
It is important to note a discrepancy between the Polymarket YES price and the Polydata on-chain mid-price: Polymarket’s current YES price is 39.0%, whereas the Polydata mid-price shows 57.0%. This gap highlights differing assessments depending on data source.
The combined picture of a 22.0 pp price drop alongside $43K net whale buying suggests conflicting signals in the market about the likelihood of a US-Iran diplomatic meeting by July 31, 2026. Whales appear to be positioning for a higher probability even as the broader market price declines, reflecting nuanced or evolving views among large traders versus the wider participant base.
| Market | US x Iran diplomatic meeting by July 31, 2026? |
|---|---|
| Market ID | 2646850 |
| 24h price change | +22.0 pp |
| YES now (PM Breaking) | 39.0% |
| YES ~24h ago (est.) | 61.0% |
| YES (Polydata overview) | 57.0% |
| Whale net flow (24h) | $43K |
| Whale buy / sell (24h) | $76K / $33K |
| Unique whales (24h) | 120 |
| Volume 24h (PM) | $63K |
| Unique traders (Polydata) | 986 |
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.