What are the current odds for "S&P 500 (SPX) Opens Up or Down on March 16?"?

As of March 2026, prediction markets give Up a 100.0% probability. This market is trading on Polymarket with $194.1K in total volume.

Where can I trade on "S&P 500 (SPX) Opens Up or Down on March 16?"?

This market is available on Polymarket. You can trade Up shares at 100.0% or Down shares at 0.0%. The market has $257.7K in liquidity.

When does this prediction market close?

This market is scheduled to resolve Today (Mar 16, 2026). After resolution, winning shares pay out $1.00 each.

Total Active Markets

Count of all non-resolved markets currently tracked across Polymarket, Kalshi, and Limitless.

122,755

Total Volume

Lifetime trading volume across all platforms. Polymarket and Kalshi report volume directly; Limitless volume is cumulative USDC traded.

$5,605,373,058

24h Volume

24-hour trading volume. Polymarket and Kalshi report this directly. Limitless does not break out 24h volume separately, so it is not included.

$481,311,792

Total Open Interest

Polymarket: sum of pool liquidity. Kalshi: open interest (contracts outstanding). Limitless: uses total volume as a proxy — no separate OI metric is available.

$2,735,360,079

Polymarket$2.36BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.

Kalshi$352.10MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.

Limitless$18.72MOIOpen interest: estimated from total volume traded (USDC). Limitless does not report a separate OI metric.

Total Active Markets

Count of all non-resolved markets currently tracked across Polymarket, Kalshi, and Limitless.

122,755

Total Volume

Lifetime trading volume across all platforms. Polymarket and Kalshi report volume directly; Limitless volume is cumulative USDC traded.

$5,605,373,058

24h Volume

24-hour trading volume. Polymarket and Kalshi report this directly. Limitless does not break out 24h volume separately, so it is not included.

$481,311,792

Total Open Interest

Polymarket: sum of pool liquidity. Kalshi: open interest (contracts outstanding). Limitless: uses total volume as a proxy — no separate OI metric is available.

$2,735,360,079

Polymarket$2.36BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.

Kalshi$352.10MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.

Limitless$18.72MOIOpen interest: estimated from total volume traded (USDC). Limitless does not report a separate OI metric.

Polymarketeconomics

S&P 500 (SPX) Opens Up or Down on March 16?

Updated Today

On March 16, 2026, the S&P 500 will open either up or down from the previous close—an event with 100% certainty that serves as a baseline market timing test. This binary outcome captures daily directional movement rather than predicting a specific price level.

Current Probability

100.0%

Trade on Polymarket

UpDown

If Up wins

$1.00 return per $1

If Down wins

$2000.00 return per $1