PolymarketCheck availabilityNo KYCVerified resolution dataWell calibratedData quality warningStale data
Data as of Oct 27, 2026, 10:40 AM UTC · policy pm-quality-4
Selected book midpoint
Up · —
Loading selected book…
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Stored reference
Up 65%
Up 65%Market quality
≤49 / 100
Low quality24h Volume
$9.4K
Liquidity
$26.2K
High liquidityOpen interest
$7.9K
Bid / Ask
— / —
UpSpread
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Comments
0
Market data
Updated 5 hours ago
StaleOct 26, 26, 12:00 PM UTCOct 27, 26, 8:00 PM UTC
Chart and changes show stored historical probabilities, not the selected live book.
Trends
Selected row: book midpoint. Other rows: stored references, possibly normalized; 24h changes use stored history.
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
Top holders
Loading top holders
Market depth · Up
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Related questions for context, not a comparison of equivalent contracts.
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KalshiRules
This market will resolve to "Up" if the official S&P 500 Index closing price for S&P 500 (SPX) on Tuesday, October 27, 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 Tuesday, October 27, 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.