PolymarketCheck availabilityNo KYCVerified resolution dataWell calibratedCurrent implied probability
Down 84%+34.0pt
Down 84%+34.0ptMarket quality
66 / 100
Medium quality24h Volume
$5.2K
Liquidity
$26.3K
High liquidityBid / Ask
15.0% / 17.0%
Spread
2.0 pt
Moderate spreadComments
0
Market data
Updated 8 minutes ago
Sep 25, 26, 12:00 PM UTCSep 28, 26, 8:00 PM UTC
Trends
Venue terms
Source: Polymarket
Informational venue terms only; CoinRithm paper trading uses its own rules.
- Minimum order (shares):
- 5
- Tick size:
- 1 percentage points
- Fees:
- Yes
Related Markets
Related questions for context, not a comparison of equivalent contracts.
Rules
This market will resolve to "Up" if the official S&P 500 Index closing price for S&P 500 (SPX) on Monday, September 28, 2026 is higher than the official S&P 500 Index closing price for SPX on the most recent prior trading day.
- This market will resolve to "Down" if the official S&P 500 Index closing price for S&P 500 (SPX) on Monday, September 28, 2026 is lower than the official S&P 500 Index closing price for SPX on the most recent prior trading day.
- E.g., ordinarily, a market on Monday would refer to the previous Friday for its most recent closing price, unless that Friday were a market holiday, in which case it would refer to Thursday, or the next most recent trading day.
- If the two specified closing prices are exactly equal, this market will resolve 50-50.
- Note that all figures will be rounded to the nearest cent using standard rounding.
- If SPX does not trade at all during the regular session, the market will resolve 50-50.