Current implied probability
Up 100%+26.4pt
Market quality
86 / 100
High quality24h Volume
$24.5K
Liquidity
$158K
High liquidityBid / Ask
99.9% / 100.0%
Spread
0.1 pt
Tight spreadComments
0
Market data
Updated 1 minute ago
Aug 20, 26, 12:00 PMAug 21, 26, 8:00 PM
Trends
100%
0%
Rules
This market will resolve to "Up" if the official S&P 500 Index open price for S&P 500 (SPX) on August 21 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 open price for S&P 500 (SPX) on August 21 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 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
KALSHIBTC price on Aug 21, 2026 at 5pm EDT?
- $71,000 or above+39.0pt99%
- $70,000 or above+19.0pt99%
- $70,500 or above+28.0pt99%
+97 more outcomes
- Total Vol
- $5.5M
- 24h Vol
- $3M
POLYMARKETBitcoin above ___ on August 21?
- 52,000100%
- 54,000100%
- 56,000100%
+8 more outcomes
- Total Vol
- $1.9M
- 24h Vol
KALSHIHow high will BTC get in August?
- Above $75,000.00+63.0pt99%
- Above $72,500.00+22.0pt99%
- Above $95,000.0099%
+15 more outcomes
- Total Vol
- $3.7M
KALSHIBitcoin price at the end of 2026
- 70,000 to 74,999.99-1.9pt11.4%
- 75,000 to 79,999.99-0.7pt10.5%
- 80,000 to 84,999.99+4.3pt10.5%
+25 more outcomes
- Total Vol
POLYMARKETEthereum above ___ on August 21?
- 1,400+0.5pt100%
- 1,500+0.1pt100%
- 1,600+0.2pt100%
+8 more outcomes
POLYMARKETBitcoin above ___ on August 22?
- 52,000+0.2pt100%
- 54,000+0.1pt100%
- 56,000+0.2pt100%
+8 more outcomes
- Bitcoin Up or Down on August 21?
- ETH price on Aug 21, 2026 at 5pm EDT?
- Anthropic IPO by __?
- XRP above ___ on August 21?
- Bitcoin price on August 21?
- How high will ETH get in August?
- Will Anthropic’s valuation hit __ by December 31?
- Bitcoin above ___ on August 23?
- XRP price at Aug 21, 2026 at 5pm EDT?
- BTC price range on Aug 21, 2026 at 5pm EDT?
- ETH price range on Aug 21, 2026 at 5pm EDT?
- Bitcoin above ___ on August 26?
Frequently asked questions
- What are the current odds for S&P 500 (SPX) Opens Up or Down on August 21??
- Polymarket prices Up at 100% as of August 21, 2026.
- When does S&P 500 (SPX) Opens Up or Down on August 21? resolve?
- S&P 500 (SPX) Opens Up or Down on August 21? is scheduled to resolve on August 21, 2026.
- How is S&P 500 (SPX) Opens Up or Down on August 21? settled?
- Polymarket settles this market as follows: This market will resolve to "Up" if the official S&P 500 Index open price for S&P 500 (SPX) on August 21 is higher than the official S&P 500 Index closing price for SPX on the most recent prior trading day.