0dteclose Arm a rule
SPXcash-settled15-min delayed
CBOE stamps each payload with its publish time; the prints inside are about 15 minutes older. Every as-of time on this site is the publish time minus 15 minutes — the time the prices were actually true.

What 4:00 does to your SPX 0DTE

—--:--:-- to the closeloading… · 4:00pm ET on the current session

Enter your strike and price.

debit you paid, or credit you received

Seven closes
The delayed price and ±0.25%, ±0.5% and ±1% of it — a spread of closes to see the arithmetic at, not a forecast of any of them. The one that happens is the 4:00 print.

How SPX 0DTE (SPXW, PM-settled weeklys) settles at 4:00

Settlement
Cash-settled to the official S&P 500 closing value on expiration day. No shares change hands; ITM value × 100 is credited/debited. OTM at the close expires worthless.
After the close
Nothing after 4:00pm ET changes the outcome — the closing value is final.
Caveats
  • Standard SPX monthlies (3rd Friday, AM-settled) settle at the OPEN; this simulator covers PM-settled SPXW only.
  • The official close is computed from last sales of the 500 components and can differ from the last-traded index print by a few cents.

Broker-universal mechanics only; exercise cutoffs and what a broker does with a position you can't afford to take delivery on differ by broker — per-broker table. Verified 2026-09-25 · sources.

Quick answers

What time do SPX 0DTE options expire?

Expiring SPX contracts stop trading at 4:00pm ET on expiration day (early-close days end earlier). Settlement is to the official closing index value at 4:00pm — nothing after the close changes it.

What happens if my SPX 0DTE is in the money at 4:00?

You receive (long) or pay (short) the intrinsic value × 100 per contract in cash. No shares, no assignment.

What is my breakeven at expiration?

Call: strike + price paid. Put: strike − price paid. The close has to be beyond that line for a long position to finish with a gain; the simulator shows the distance from the 15-minute delayed price in points and percent.

Is the price on this page live?

No. Quotes are 15-minute delayed CBOE data and the page says the as-of time next to every number. At the 3:30 check you are looking at roughly 3:15's price.

Does this tell me whether to hold or sell?

No. It computes outcomes for the position you enter and, if you arm a rule, reports the same arithmetic at the time you chose. The decision is yours.

Does the PDT rule apply to 0DTE? (2026 status by broker)

The $25,000 pattern-day-trader minimum was eliminated effective 2026-06-04 under the FINRA Rule 4210 pattern-day-trader amendments; brokers phase in their own day-trading margin checks through October 2027, so what actually happens now depends on which broker you use — see the PDT-repeal tracker and the per-broker status for Robinhood, Charles Schwab (thinkorswim), tastytrade, Interactive Brokers, and Webull. Note: cash accounts were never subject to the rule; options proceeds settle next business day.

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Rule changes, not signals