S&P 500 (SPX) Opens Up or Down on October 19?

About S&P 500 (SPX) Opens Up or Down on October 19?

S&P 500 (SPX) Opens Up or Down on October 19? is a prediction market on Polymarket. Each outcome's price is the market's implied probability, and a correct share pays 1 USDC when the market resolves.

Yes leads at 100%, decimal odds 1.00.

Yes

100% · odds ×1.00

No

0% · odds ×2000.00

Closes

19 Oct 2026