Market comparison
How many House seats will the Democrats win in South Carolina?
2 venues · 4 outcome rows · 4 comparable lines · event identity linked · 0 verified parity · active
Kalshi
Open venue ↗4 outcomes · $44K reported volume
Observed 2m ago
Recorded venue end date: May 13, 2027
Polymarket
Open venue ↗4 outcomes · $13K reported volume
Observed 2m ago
Recorded venue end date: Nov 4, 2026
Known rule differences between venues
- Seat counts depend on when races are called; venues use different settlement deadlines for uncalled seats.
A shared identity alone does not make a price difference executable.
| Outcome | Kalshi | Polymarket | Difference |
|---|---|---|---|
0 Partial parityPayoffs match in ordinary outcomes; see the rule differences above. | 1.6 pp | ||
1 Partial parityPayoffs match in ordinary outcomes; see the rule differences above. | 1.5 pp | ||
2 Partial parityPayoffs match in ordinary outcomes; see the rule differences above. | 2.5 pp | ||
3+ Partial parityPayoffs match in ordinary outcomes; see the rule differences above. | 2.3 pp |
0
Partial parityPayoffs match in ordinary outcomes; see the rule differences above.
Kalshi
Polymarket
Price difference 1.6 pp
1
Partial parityPayoffs match in ordinary outcomes; see the rule differences above.
Kalshi
Polymarket
Price difference 1.5 pp
2
Partial parityPayoffs match in ordinary outcomes; see the rule differences above.
Kalshi
Polymarket
Price difference 2.5 pp
3+
Partial parityPayoffs match in ordinary outcomes; see the rule differences above.
Kalshi
Polymarket
Price difference 2.3 pp
Prices are shown as percentages of a $1 payout. “pp” means percentage points. A dash means data is unavailable.