What does the Monthly view show on GEXBoard?

The Monthly view pools every option that expires within roughly the next 20 trading days (about one calendar month), then sums the gamma exposure strike by strike across all of those expirations. The resulting Call Wall, Put Wall, and Gamma Flip describe where dealer gamma concentrates by price across the whole month — not at any single expiration date. It is an aggregate, structural view, not one contract.

Is there a single expiration date for the Monthly or Weekly levels?

No. Weekly, Monthly, and 90 AGG are aggregates that combine many expiration dates into one per-strike profile. There is no single contract date behind them. Only the 0DTE view (today's expiration) and the 1DTE view (the next available expiration) correspond to a single, specific expiration date you can pick in a broker.

Which DTE view should I use to pick a contract in my broker?

Use 0DTE or 1DTE. Those isolate one expiration date, so the Call Wall, Put Wall, and Gamma Flip you see correspond to the exact contract you would trade. Weekly, Monthly, and 90 AGG are best used as broader structural support and resistance zones, since they blend gamma from many expirations and do not map to a single contract.

Why do the Weekly and Monthly GEX levels change every day even though open interest settles overnight?

Two reasons. First, the window is rolling: it is anchored to today, so each day the set of included expirations shifts forward and contracts that expire drop out. Second, the levels are gamma-weighted, and each contract's gamma is recomputed continuously from the current spot, time to expiry, and implied volatility. Even with open interest fixed for the day, the gamma-weighted aggregate moves.

What is the difference between the 0DTE view and the Weekly view?

0DTE shows only the contracts expiring today — a single expiration with the sharpest, most concentrated gamma. Weekly pools every expiration over roughly the next five trading days and sums their gamma by strike, producing a smoother, more structural picture that spans several expiration dates instead of one.

What the DTE Views Mean: 0DTE, Weekly, Monthly & 90 AGG

What the DTE Filter Actually Does

Every options contract has an expiration date. A single ticker like SPY has many of them listed at once — today, tomorrow, this Friday, next Friday, the monthly, and so on. Each expiration has its own full chain of strikes, its own open interest, and its own gamma.

The DTE filter is simply a switch for which of those expirations get included before we compute the levels. Change the filter and you change the set of contracts that feed the Call Wall, Put Wall, and Gamma Flip. Nothing else about the math changes — only the input set.

There are two fundamentally different kinds of view, and the distinction is the whole point of this article:

Single-expiration views — 0DTE and 1DTE — isolate one expiration date.
Aggregate views — Weekly, Monthly, 90 AGG — pool many expirations into one combined profile.

Single-Expiration Views: 0DTE & 1DTE

These are the precise ones.

0DTE filters to only the contracts that expire today. After today's close they've settled, so the view rolls to the next available expiration.
1DTE filters to the next expiration after today — whatever the soonest future expiration in the chain is.

Because each isolates a single expiration, the level you see maps to one specific date. If GEXBoard shows a 0DTE Call Wall and it's a Tuesday, that wall is built from contracts expiring that Tuesday — the exact contract you'd pull up in your broker.

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One detail that trips people up: the "next" expiration depends on the ticker. SPY, QQQ and the big indices list an expiration almost every trading day, so 1DTE is usually tomorrow. A single stock might only list weekly (Friday) expirations, so its 1DTE could be several days out. Always read the date, not the label.

Aggregate Views: Weekly, Monthly & 90 AGG

These do not correspond to a single date. Each one defines a window of time and pulls in every expiration inside it:

Weekly → every expiration from today through roughly the next 5 trading days.
Monthly → every expiration from today through roughly the next 20 trading days (about one calendar month of sessions).
90 AGG → every expiration within the next 90 calendar days. (The "AGG" is short for aggregate.)

On a typical day, an active index like SPY can have a dozen or more separate expirations inside the Monthly window alone. The aggregate view takes all of them and combines them into one per-strike picture.

How the Aggregation Actually Works

Here's the part that answers "what exactly am I looking at." When you select an aggregate view, the engine does four things:

Collect every contract that expires inside the window (e.g. for Monthly, all expirations in the next ~20 trading days).
Compute the gamma exposure of each contract using its own gamma. A contract expiring in 3 days has razor-sharp gamma; one expiring in 25 days has flatter gamma. Each is measured on its own terms.
Sum the exposure by strike, pooling every expiration together. The aggregate gamma at strike 760 is the 760 contracts from every included expiration added up into one number.
Read the levels off that combined profile: the Call Wall is the strike with the most positive summed gamma, the Put Wall the most negative, the Gamma Flip where the running total crosses zero.

GEX(strike) = Σ_expirations [ Γ × OI × 100 × S² ]

The standard gamma-exposure formula (Hull, Ch. 17–19), summed over every expiration in the selected window at that strike. In single-expiration views (0DTE / 1DTE) the sum has one term. In aggregate views it has many — which is exactly why those levels don't map to a single contract.

So a "Monthly Call Wall" at, say, $765 means: of all the call gamma sitting at every strike, pooled across every expiration in the next month, $765 is where it concentrates the most. It's a statement about price, not about a single expiration date. That strike is a wall because open interest piles up there across several different expirations at once — often a round number where positioning clusters.

It's a Rolling Window — It Recomputes Daily

The window is always anchored to today. That has two consequences traders should expect:

The set of expirations shifts every day. Tomorrow, today's expiration drops out and a new far-edge expiration may enter. So the Monthly profile is never frozen — it evolves as the calendar moves.
The levels move even though open interest is fixed for the day. Open interest only settles overnight, but the levels are gamma-weighted, and gamma is recomputed continuously from spot, time-to-expiry, and implied volatility. As expirations approach, their gamma sharpens and pulls more weight. (More on that in Call Wall & Put Wall.)

This is why an aggregate level is best read as a zone that drifts, not a fixed line nailed to a contract.

Which View Should You Use?

View	What it is	Best for
0DTE	One expiration — today	Same-day scalps; the exact contract expiring today
1DTE	One expiration — next session	Overnight / next-day trades on a specific contract
Weekly	~5 trading days, pooled	Swing zones for the week ahead
Monthly	~20 trading days, pooled	Broader structural support/resistance
90 AGG	Next 90 days, pooled	The big-picture positioning map

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Rule of thumb: if you need a level tied to a contract you're about to buy, use 0DTE or 1DTE and trade that exact expiration. If you want the big walls that hold across the week or month — the round-number zones price keeps respecting — use Weekly, Monthly, or 90 AGG and treat them as areas, not tick-precise targets.

The Bottom Line

The DTE filter isn't five different products — it's five different lenses on the same chain. 0DTE and 1DTE zoom in on one expiration (one date, one contract). Weekly, Monthly and 90 AGG zoom out and pool gamma across many expirations into a structural map by price. Neither is more "correct" — they answer different questions. Match the lens to your trade: precise contract, or broad zone.

What the DTE Views Mean:0DTE, Weekly, Monthly & 90 AGG