Prediction Markets Morning — 2026-09-19
Bitcoin and Trump-related markets surge on Kalshi and Polymarket as Chelsea trades dominate volume.
Bitcoin and Trump-related markets surge on Kalshi and Polymarket as Chelsea trades dominate volume.
The Overnight Picture
Data was frozen at 08:03 ET on September 19, 2026. The most significant moves occurred in cryptocurrency and specific political event contracts, with several markets shifting by more than 40 percentage points within the 24-hour window.
Top Kalshi Movers
On Kalshi, the market for whether it will rain in Minneapolis surged from 50.0% to 99.0%, a gain of 49.0 points. Simultaneously, the contract for Trump saying 'Third Term' before Sep 21 rose 93.0 points to 99.0%. Other high-magnitude moves included Hiroshima winning (+42.0 pts) and Trump saying 'Slopadopolous' (+85.0 pts).
Additional notable increases included Trump saying 'BBC' (+71.0 pts), endorsing 5 people on Truth Social (+66.0 pts), and mentioning 'Greenland' (+48.0 pts). Neal Shipley’s chance of winning the Biltmore Championship also climbed 25.5 points to 28.5%.
| # | Market | Probability | 24h move | Significance | Volume |
|---|---|---|---|---|---|
| 1 | Will it rain in Minneapolis on Sep 19, 2026? | 99.0% | +49.0 pts | 100 | $20,050 |
| 2 | Will Trump say "Third Term" before Sep 21, 2026? | 99.0% | +93.0 pts | 100 | $8,797 |
| 3 | Will Trump say "Third Term" before Oct 1, 2026? | 99.0% | +78.0 pts | 100 | $4,069 |
| 4 | Hiroshima wins | 99.0% | +42.0 pts | 99 | $84,721 |
| 5 | Will Trump say "Slopadopolous / Slopadopolus" before Oct 1, 2026? | 99.0% | +85.0 pts | 99 | $691 |
| 6 | Will Trump say "BBC" before Oct 1, 2026? | 99.0% | +71.0 pts | 95 | $808 |
| 7 | Will Trump endorse at least 5 people on Truth Social this week? | 99.0% | +66.0 pts | 95 | $3,441 |
| 8 | Will Trump say "Greenland" before Oct 1, 2026? | 99.0% | +48.0 pts | 95 | $2,602 |
| 9 | Will Trump say "Autism" before Oct 1, 2026? | 99.0% | +33.0 pts | 90 | $4,750 |
| 10 | Will Neal Shipley win the Biltmore Championship Asheville? | 28.5% | +25.5 pts | 89 | $353K |
Top Polymarket Movers
Polymarket saw dramatic shifts in crypto prices. The likelihood of Bitcoin being above $80,000 on September 19 increased by 91.2 points to 98.6%. Ethereum above $2,600 rose 92.3 points to 97.1%. A deal between Trump and Greenland signed by December 31 gained 80.3 points to reach 94.8%.
In sports and other categories, Sanfrecce Hiroshima winning rose 43.5 points to 99.9%. Conversely, the probability of Anthropic IPO-ing by October 31 dropped 49.3 points to 4.8%. Kawasaki Frontale vs. Kashima Antlers Over/Under 4.5 goals increased 37.5 points to 56.5%.
| # | Market | Probability | 24h move | Significance | Volume |
|---|---|---|---|---|---|
| 1 | Will the price of Bitcoin be above $80,000 on September 19? | 98.6% | +91.2 pts | 100 | $143K |
| 2 | Will the price of Ethereum be above $2,600 on September 19? | 97.1% | +92.3 pts | 100 | $35,918 |
| 3 | Trump x Greenland deal signed by December 31? | 94.8% | +80.3 pts | 100 | $140K |
| 4 | Will Sanfrecce Hiroshima win on 2026-09-19? | 99.9% | +43.5 pts | 100 | $79,531 |
| 5 | Kawasaki Frontale vs. Kashima Antlers: O/U 4.5 | 56.5% | +37.5 pts | 100 | $19,793 |
| 6 | Dota 2: 1win vs Team Nemesis (BO3) - PGL Wallachia Group Stage | 5.0% | −79.5 pts | 100 | $136K |
| 7 | Will the price of Bitcoin be above $78,000 on September 19? | 99.8% | +47.8 pts | 100 | $75,043 |
| 8 | Will Bitcoin reach $82,000 September 14-20? | 57.0% | +50.5 pts | 100 | $62,713 |
| 9 | Will Bitcoin reach $82,500 in September? | 81.5% | +45.0 pts | 100 | $119K |
| 10 | Will Anthropic IPO by October 31, 2026? | 4.8% | −49.3 pts | 100 | $85,305 |
Largest Trades
The largest single trade recorded was $666K on Polymarket for 'Will Chelsea FC win on 2026-09-18?' at NO (64%). This was followed by another $441K NO trade on the same market. On Kalshi, the largest trade was $133K on 'Will House Control be Republican AND Senate Control be Republican for Feb 2027?' at NO (89%).
Other significant volume included $373K YES on Chelsea FC, $323K YES on Brentford FC, and $159K YES on United Russia gaining the most seats. On Kalshi, $80K was traded on TX-15 Republican win at NO.
| Venue | Market | Side | Notional | Price | Time (ET) | 5m move |
|---|---|---|---|---|---|---|
| Polymarket | Will Chelsea FC win on 2026-09-18? | NO | $666K | 64% | 14:50 ET | −1.0 pts |
| Polymarket | Will Chelsea FC win on 2026-09-18? | NO | $441K | 64% | 14:27 ET | — |
| Polymarket | Will Chelsea FC win on 2026-09-18? | YES | $373K | 38% | 14:48 ET | 0.0 pts |
| Polymarket | Will Brentford FC win on 2026-09-18? | YES | $323K | 37% | 14:27 ET | +1.0 pts |
| Polymarket | Will Chelsea FC win on 2026-09-18? | NO | $276K | 62% | 14:48 ET | 0.0 pts |
| Kalshi | Will House Control be Republican AND Senate Control be Republican for Feb 2027? | NO | $133K | 89% | 22:52 ET | −1.0 pts |
| Kalshi | Will Republican win the House race for TX-15? | NO | $80,000 | 64% | 18:48 ET | — |
| Kalshi | Will Republican win the House race for TX-15? | NO | $79,988 | 64% | 18:48 ET | — |
| Kalshi | Miami (FL) wins | YES | $76,434 | 93% | 17:35 ET | — |
| Kalshi | Learner Tien wins | YES | $76,166 | 95% | 10:15 ET | +3.5 pts |
Where Kalshi and Polymarket Disagree
Cross-venue analysis reveals divergences in 2028 Democratic Presidential nominee markets. Alexandria Ocasio-Cortez shows a 3.0 pt gap, priced higher on Polymarket (18.6%) than Kalshi (15.5%). Gavin Newsom has a 2.5 pt gap, also favoring Polymarket (16.0% vs 13.5%).
Michelle Obama presents an inverse dynamic, with Kalshi pricing her nomination odds at 2.1% compared to Polymarket's 0.3%, a 1.9 pt difference. Josh Shapiro and Kamala Harris show gaps of 1.6 pts each, with Polymarket assigning higher probabilities.
| Contract | Grade | Kalshi | Polymarket | Gap |
|---|---|---|---|---|
| Will Alexandria Ocasio-Cortez be the Democratic Presidential nominee in 2028 | B | 15.5% | 18.6% | 3.0 pts |
| Will Gavin Newsom be the Democratic Presidential nominee in 2028 | B | 13.5% | 16.0% | 2.5 pts |
| Will Michelle Obama be the Democratic Presidential nominee in 2028 | B | 2.1% | 0.3% | 1.9 pts |
| Will Josh Shapiro be the Democratic Presidential nominee in 2028 | B | 4.7% | 6.3% | 1.6 pts |
| Will Kamala Harris be the Democratic Presidential nominee in 2028 | B | 8.1% | 9.7% | 1.6 pts |
| Will Mark Kelly be the Democratic Presidential nominee in 2028 | B | 4.2% | 3.0% | 1.1 pts |
| Will Rahm Emanuel be the Democratic Presidential nominee in 2028 | B | 3.1% | 2.1% | 1.1 pts |
| Will J.B. Pritzker be the Democratic Presidential nominee in 2028 | B | 1.9% | 1.3% | 0.7 pts |
| Will Andy Beshear be the Democratic Presidential nominee in 2028 | B | 3.0% | 2.5% | 0.6 pts |
| Will James Talarico be the Democratic Presidential nominee in 2028 | B | 1.8% | 2.4% | 0.5 pts |
Cross-Market Opportunities
Price variances exist across venues for identical or similar events. For instance, the divergence in AOC and Newsom odds represents a theoretical spread. However, these calculations must account for transaction fees, settlement timing differences, and execution risk.
Similarly, the discrepancy in Michelle Obama's odds could theoretically allow for offsetting positions, subject to liquidity constraints and platform-specific rules. No guaranteed profit is implied; these are informational observations of price variances.
Five Markets to Watch Today
1. Will it rain in Minneapolis on Sep 19, 2026? (Kalshi): Moved +49.0 pts to 99.0%; monitor for final settlement confirmation. [km1]
2. Will the price of Bitcoin be above $80,000 on September 19? (Polymarket): Surged +91.2 pts to 98.6%; watch for volatility around the close. [pm1]
3. Will Alexandria Ocasio-Cortez be the Democratic Presidential nominee in 2028?: Largest cross-venue disagreement at 3.0 pts; track convergence or widening. [gap1]
4. Will Chelsea FC win on 2026-09-18?: Highest volume trade ($666K); observe post-match resolution impact on related soccer markets. [pt1]
- Will it rain in Minneapolis on Sep 19, 2026? Most significant Kalshi move
- Will the price of Bitcoin be above $80,000 on September 19? Most significant Polymarket move
- Will Alexandria Ocasio-Cortez be the Democratic Presidential nominee in 2028 Largest cross-venue disagreement
- Will Chelsea FC win on 2026-09-18? Largest trade of the session
- Will Trump say "Third Term" before Sep 21, 2026? Runner-up significant move
Methodology and Timestamp
Snapshot frozen Sep 19, 08:03 ET ET (2026-09-19 12:03 UTC). Evidence hash 91c744b3da67403c.