Build your first GEX chart
Choose a market, show the key levels and check their source.
In this article 6 sections
1. Choose a market
Sign in to your workspace and select SPY, QQQ or IWM. Read the source and data status before the price.
Demo values are fictional. A Historical week view uses archived prices and after-session reconstructions; it is not a current feed.
A put wall approached from below
Review SPY’s $760.00 test and a completed-candle plan.
Choose a checkpoint for 1-minute detail. Later prices stay hidden.
Watch the approach. A put wall does not guarantee support.
Historical review. Plans are hypothetical; fills, delivered signals and a trading edge are not proved.
- Context
- Preopen walls: call $770.00, put $760.00. XNAS.ITCH prices approached from below. The 15-minute-delayed model was stale; alerts were suppressed. Pause until model timing and a fresh broker quote are verified. No order was authorized.
- Wait for
- Wait for the 10:20–10:24 block to finish. It tested $760.00 and closed $759.40; the hypothetical condition is known at 10:25 ET.
- Execution
- Hypothetical sell-limit reference: $759.40 after 10:25; no fill assumed. Verify quote, spread and borrow. Size ≤ floor(risk budget / $0.71), further capped by buying power and borrow, with costs reserved. No order was submitted.
- Invalidation
- Stop reference $760.11: $0.01 above the completed $760.10 high. Reference risk is $0.71 per share; this is an illustration, not a calibrated rule or guaranteed fill.
- Management
- 1R target: $758.69. Confirm broker acceptance and position state; manage only an actual fill. Spreads, slippage, gaps and fees affect exits. No option or futures payoff is inferred.
The 10:29 range contained $758.69, observable at 10:30. Price did not reach $760.11 afterward. No entry or exit fill is proven; no realized P&L follows.
Source, timestamps & selection
- Candles
- Databento XNAS.ITCH · venue OHLCV, not consolidated SIP volume. These are venue bars, not a consolidated market tape.
- Model source
- Tradier sandbox · original archived native model. Source delay: 900 seconds.
- Model built
2026-09-10T11:01:00.870180+00:00- First recorded
2026-09-10T11:03:54.609730+00:00- Open interest timestamp
- Unknown. No point-in-time open-interest clock was supplied.
- Evidence limit
- A local producer cycle recorded this model before the cash open. The producer log is mutable and has no independently sealed receipt. The first and selected records report stale=true and alerts_suppressed=true; no enabled alert, trader broadcast or execution is proved. Exact OI availability is unknown. The chart uses a different price provider. Bar-end times are the earliest theoretical observation times after a minute closes, not proven client delivery times.
- Why this day
- Four editorial examples selected after reviewing all 12 SPY/QQQ/IWM sessions from September 8–11, 2026. Hindsight selection is explicit. Untouched levels, recrossings and the invalidation-first case remain visible; no hit rate or predictive performance is claimed.
The producer record is mutable. “First recorded” describes the recorded archive; it is not proof that a trader received the same levels at that instant.
Archive fingerprints
- resource-case-study-census.json
af9379d9eb6802044356957fd6cf9a96b203eb57bddafd844c2d56ebf679de85 - cycles.parquet
c7ff45da2a4ddd432d1dec3763bf6a065c46d8f0430327d3adde618d38b0f4b9 - contracts-SPY.parquet
b7393e04904dc43c15265ab9c003a4cc166e3f2061685ad080f82dddfcbbb36e - SPY-preview.json
4b9a7844f626916b43816b53b61761a5cc0d629c74dcd99d7ca461f7bf3b0065
Explore the concept with a simplified model
2. Start with Simple
Choose Simple, then Nearest. On mobile, use the Expiry selector. Read the actual expiry date; 0DTE appears only when it matches the session.
Select 5m candles. Candle interval changes the price display; expiry changes the options population.
3. Show the key levels
Open Layers → Key levels only. Check Call walls & bands, Put walls & bands and Gamma flips. Missing model levels remain missing.
Enable Strike profile to inspect the concentrations behind the lines. A wall is a reference, not a guaranteed reversal.
Sources: Options Industry Council (OCC): Gamma; Cboe — Mandy Xu: Much Ado About 0DTEs: Evaluating the Market Impact of SPX 0DTE Options.
4. Inspect and save
Choose Pro → Expiry table and model context. Check Exposure by expiry and Behind the numbers for units, sign assumptions, coverage and Profile built at.
Use Save layout to keep your setup. Confirm the save feedback before leaving.
Quick check
Name the symbol, expiry, data mode and visible layers. For historical reconstructions, include the session and after-session build timing.
- The symbol and expiry match your selection.
- The source status is clear.
- Only the layers you need are visible.
Sources and editorial notes
Read the primary references and editorial policy
Published by GEXfreak. Prism by GEXfreak is the product described in these guides. Definitions reference the primary sources below; examples and tool-selection checklists are GEXfreak’s own illustrations. This is product education, not independent investment research.
These sources explain options mechanics and data. They do not endorse Prism or validate the predictive value of its levels. Undated pages are marked below; the checked date is when the source was reviewed.
- Gamma — Options Industry Council (OCC). Publication date not stated. Checked .
- Much Ado About 0DTEs: Evaluating the Market Impact of SPX 0DTE Options — Cboe — Mandy Xu. Published 2023-09-08. Checked .
For the product’s calculation and data boundaries, read Prism’s methodology.
Build your chart.
Open the workspace and follow these steps.
Demo values are fictional. Create an account to save your layout; review current access conditions on the pricing page.