Current implied probability
Up 53.5%
Market quality
71 / 100
Medium quality24h Volume
$28.8K
Liquidity
$8.3K
Medium liquidityBid / Ask
52.0% / 55.0%
Spread
3.0 pt
Moderate spreadComments
0
Market data
Updated 9 minutes ago
Sep 8, 26, 12:00 PM UTCSep 9, 26, 8:00 PM UTC
Trends
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 Wednesday, September 9, 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 Wednesday, September 9, 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.
Open markets
Exchange
ROBINHOOD (ROTHERA)Ben Shelton vs Carlos Alcaraz Quarter Finals match
- Carlos Alcaraz62.5%
- Ben Shelton+1.0pt37.5%
- Total Vol
- $534.5K
- 24h Vol
- $7.4M
ROBINHOOD (ROTHERA)Atpmatch MUSO 26 Ftiaamic
- AMIC+38.0pt78.4%
- FTIA-37.0pt21.6%
- Total Vol
- $5.4M
- 24h Vol
- $5.4M
POLYMARKETBitcoin above ___ on September 9?
- 72,000+0.3pt100%
- 74,000+0.9pt100%
- 68,000+0.1pt100%
+8 more outcomes
KALSHIBTC price on Sep 9, 2026 at 5pm EDT?
- $76,000 or above99%
- $75,000 or above99%
- $74,750 or above99%
+77 more outcomes
- Total Vol
- $491.4K
- 24h Vol
- $491.3K
KALSHIBTC 15 min · $79,081.29 target
- Yes99%
- No1%
- Total Vol
- $1.2M
- 24h Vol
- $481.3K
KALSHIBTC price on Sep 9, 2026 at 3am EDT?
- $78,500 or above99%
- $78,600 or above99%
- $78,400 or above99%
+97 more outcomes
- Total Vol
- $383.1K
- 24h Vol
- $366.5K
- BTC price on Sep 11, 2026 at 5pm EDT?
- Ethereum above ___ on September 9?
- Wtamatch WUSO 26 Jpegenav
- Bitcoin above ___ on September 10?
- Anthropic IPO by which date?
- Bitcoin above ___ on September 11?
- Bitcoin price at the end of 2026
- How high will BTC get in September?
- Wtamatch WUSO 26 Mandcgau
- ETH price on Sep 9, 2026 at 5pm EDT?
- Wtamatch WUSO 26 Qzheeryb
- Bitcoin price on September 9?
Frequently asked questions
- What are the current odds for S&P 500 (SPX) Up or Down on September 9??
- Polymarket prices Up at 53% as of September 9, 2026.
- When does S&P 500 (SPX) Up or Down on September 9? resolve?
- S&P 500 (SPX) Up or Down on September 9? is scheduled to resolve on September 9, 2026.
- How is S&P 500 (SPX) Up or Down on September 9? settled?
- Polymarket settles this market as follows: This market will resolve to "Up" if the official S&P 500 Index closing price for S&P 500 (SPX) on Wednesday, September 9, 2026 is higher than the official S&P 500 Index closing price for SPX on the most recent prior trading day.