Will S&P 500 (SPX) hit $8,200 (HIGH) in December?

Prediction markets currently give a 18% probability that Will S&P 500 (SPX) hit $8,200 (HIGH) in December?. This contract trades at 18¢ on Polymarket, closing December 31, 2026. This market prices an extremely unlikely move requiring SPX to rally roughly 3.5% from current levels to $8,200 within 258 days, yet the 946.9% implied yield on the YES side reflects severe illiquidity with only $10.75 in 24-hour volume and a wide 9¢ spread.

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18¢
Bid/Ask 15/20¢·Spread 5¢·Vol $0·OI $1,651.539·Closes Dec 31, 2026·253d remaining
0xc3c873cd1cc3b91576e3cfe70d661768407bdac76fdf99e27b82c26ce06dd5a2
7-day price117 snapshots · 3 regime
18¢18¢ current
Apr 98¢Apr 20

Analysis

4d ago

This market prices an extremely unlikely move requiring SPX to rally roughly 3.5% from current levels to $8,200 within 258 days, yet the 946.9% implied yield on the YES side reflects severe illiquidity with only $10.75 in 24-hour volume and a wide 9¢ spread. The neutral regime score and flat 7-day price action suggest the 13¢ price may be stale or driven by minimal trading rather than genuine conviction, making this a classic low-liquidity trap where the implied yield overstates actual expected returns.

Resolution rules

This market will resolve to "Yes" if, at any point between market creation and market close on the final day of trading for December 2026, any 1-minute candle for S&P 500 (SPX) shows a final "High" price equal to or above the listed price. Otherwise, this market will resolve to "No." All prices recorded during regular trading hours of the primary exchange for the instrument, as reflected in Yahoo Finance's 1-minute interval ("1m") data, will be considered. Periods when the market is officially closed (e.g., holidays or maintenance breaks) will not be considered. All times referenced are local to the primary exchange on which the index trades. The resolution source for this market is Yahoo Finance — specifically, the 1-minute interval ("1m") chart data for S&P 500 (SPX) available at https://finance.yahoo.com/quote/%5EGSPC/.

Indicators

IY (Yes) 656.8%
IY (No) 31.6%
Adj IY 328%
CRI 5
Overround 2.2%
▶ Full indicator table (5)
IndicatorValue
IY (Yes)656.8%
IY (No)31.6%
Adj IY328%
CRI5
Overround2.2%

Regime

Label
neutral
Score
0.341
Spread
5¢
Computed
4/21/2026, 8:24:59 PM
Observability lowEvent type financial
Indicators computed 4/21/2026, 8:23:18 PM

Trade

View on polymarketsf trade 0xc3c873cd1cc3b91576e3cfe70d661768407bdac76fdf99e27b82c26ce06dd5a2 yes 100

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