The market for “Will the ECB announce a 25 bps increase at the September 2026 meeting?” surged 21.0 percentage points in the past 24 hours on Polymarket, climbing from an estimated 59.5% to 80.5%.
This substantial repricing was accompanied by whale activity that moved in tandem with the price shift. Over the same period, whales contributed a net $4K into YES contracts, with $7K in buy volume against $2K in sell volume, involving 28 unique whale traders. The overall 24-hour volume on Polymarket for this market was $8K, within a lifetime volume of $28K and a total of 167 unique traders.
The combined surge in odds and whale buying suggests growing conviction among larger traders that the ECB will deliver a 25 basis point rate increase at its September 2026 meeting. The alignment of whale flow with the price move underscores that the price jump was supported by meaningful on-chain activity rather than speculative noise.
This coordinated shift points to a strong market consensus building around the likelihood of an ECB rate hike, reflecting updated expectations for monetary policy tightening at that meeting.
| Market | Will the ECB announce a 25 bps increase at the September 2026 meeting? |
|---|---|
| Market ID | 2587797 |
| 24h price change | +21.0 pp |
| YES now (PM Breaking) | 80.5% |
| YES ~24h ago (est.) | 59.5% |
| YES (Polydata overview) | 80.5% |
| Whale net flow (24h) | $4K |
| Whale buy / sell (24h) | $7K / $2K |
| Unique whales (24h) | 28 |
| Volume 24h (PM) | $8K |
| Unique traders (Polydata) | 167 |
Source: Polydata API v3 · /whales/flow + Polymarket Breaking · snapshot 2026-07-18. 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.