Intraday

The Intraday screen is a live, second-by-second chart of the SPX session, built for 0DTE. It plots where SPX is trading against the market's expected move for the day, so you can see at a glance whether price is drifting toward your short strikes. Open it from Market View.

What the chart shows

Three things are drawn over the trading day:

SPX price (blue) — the index's path through the session, read on the right axis.
Expected Move bands (green) — the range the options market is implying for the day. The dashed lines are the 1× expected move (SPX ± the at-the-money strangle price); the dotted lines are 2× that move. Horizontal reference lines also mark the SPX, EM, and EM×2 levels on the axis.
OTM Options Sum (pink) — a running total of out-of-the-money option premium, on the left axis; it generally trends down as premium decays through the day.

The intraday SPX chart with expected-move bands

Hover anywhere on the chart to read the exact values at that instant — a tooltip shows the time (ET), the SPX price, the OTM Options Sum, and the EM×1 and EM×2 ranges.

Tip

For 0DTE, the expected-move bands are your visual guardrails. While SPX stays comfortably inside them, your short strikes are out of the money; when price presses toward a band, that's your cue to pay attention.

Opening EM vs current

The Opening EM toggle changes what the horizontal reference lines anchor to:

Off (current) — the lines track the current expected move, recalculated as the strangle reprices through the day.
On (opening) — the lines lock to the opening expected move, so you can see how far price has traveled relative to the range the market set at the bell.

Live today, or review a past day

By default the chart shows today, updating live — a Live badge (with a connection icon) and a running point count sit in the header. Pick another day from the date picker to review it, and the badge switches to Historical; you can go back over the last several trading days (weekdays only).

The chart always covers the regular session (9:30 a.m. – 4:00 p.m. ET), and the first few seconds after the open are trimmed to skip the noisy rotation at the bell — so what you see is a clean session.

Resolution

The 1s / 5s / 10s / 30s buttons set how finely the session is sampled. 5s is the default — a good balance; drop to 1s for the most detail, or step up to 30s for a smoother, lighter view. The Refresh button reloads the data.

To see the strikes behind these levels, open the Options chain; to stress-test a position against a move rather than watch one unfold, see Checking risk.