The US stock market is closed after the 16:00 ET close. SP500 perpetual futures are still trading. The perp market runs 24/7, so the price below is live rather than a stale close.
Snapshot as of 03:34 UTC. The chart and price above update live. Machine-readable version.
S&P 500 index. Perplo lists it as a perpetual future: you trade the price of S&P 500, not the share itself.
There is no expiry and no market-hours window — SP500 trades 24/7. You post USDC as collateral, take either side with leverage, and settle onchain on Hyperliquid. No brokerage account.