RTH Gap Analysis Indicator for TradingView

The RTH gap analysis indicator is built for a problem every index futures trader knows well: the overnight session can travel hundreds of points, but the cash open is where a new auction often becomes visible. If you are manually marking yesterday's RTH close, today's RTH open, gap size, and key reference levels before every session, you are spending attention before the market has even given you a trade.

For ICT and SMC traders, an RTH gap is not a standalone signal. It is a piece of opening context. It tells you where the regular trading session accepted or rejected price relative to the prior cash close, and it gives you a clean framework for separating overnight movement from the session where institutional participation often expands.

What an RTH gap actually measures

An RTH gap is the difference between the previous regular trading hours close and the current regular trading hours open. On US index products, traders commonly frame RTH around the New York cash session. The exact session settings matter, especially if you trade ES, NQ, YM, or RTY futures nearly around the clock.

A positive gap means the current RTH open printed above the prior RTH close. A negative gap means it opened below it. The distance between those two prices is the gap. Simple calculation, but the useful work is in how price behaves after the bell.

The gap creates a defined area with two obvious references: the prior RTH close and the current RTH open. Price may trade through the area quickly, partially fill it, respect one edge, or leave it untouched while expanding in the opening direction. Each outcome changes the intraday narrative.

That is why a gap should be read alongside HTF bias, PD arrays, session liquidity, and opening structure. A bullish gap into daily buyside liquidity is not automatically bullish. It may be a continuation condition, a repricing event, or an efficient draw into a premium target before reversal. Context decides which one is more likely.

Why RTH gaps matter for intraday execution

The regular open concentrates volume, reprices risk from the overnight market, and often establishes the first meaningful dealing range of the day. When price opens away from the prior RTH close, traders immediately have an unresolved reference below or above the market.

That reference can matter because markets frequently revisit areas where the cash session did not transact. But "frequently" is not the same as "must." Treating every gap as a guaranteed fill is one of the fastest ways to fade a trend day without evidence.

Instead, use the gap to define questions before execution. Is the open occurring in premium or discount of the current daily range? Is price opening above a prior high after an overnight raid, or is it opening directly into opposing liquidity? Does the first 15 to 30 minutes show acceptance above the opening price, or does it displace back through it?

The answers help determine whether the gap is likely to act as a magnet, a support or resistance zone, or simply a reference left behind by a one-sided session.

The three gap behaviors worth tracking

Full gap fill

A full fill occurs when price returns to the prior RTH close after opening above it, or rallies to it after opening below it. This is the cleanest visual outcome, but it is not automatically a reversal confirmation. A market can fill a downside gap, rebalance, and continue lower with more force.

For a short setup after an upside gap fill, look for more than the fill itself. A buyside liquidity sweep, bearish displacement, CISD, or lower-timeframe market structure shift gives the trade a reason. The gap provides the location. The execution model provides the trigger.

Partial fill and rejection

Price sometimes trades into the gap, reaches equilibrium or a nearby fair value gap, then rejects without reaching the previous close. This often matters when the broader directional draw remains intact and the market only needs to rebalance part of the opening inefficiency.

A partial fill is especially useful when it overlaps with an IFVG, an opening range level, or a retracement into a lower-timeframe PD array. The confluence is more meaningful than the midpoint by itself.

Gap-and-go expansion

On strong trend days, price may barely revisit the gap. The current RTH open holds, early pullbacks remain shallow, and the market expands toward external liquidity. Traders who assume every gap must fill can miss the session's cleanest continuation setup.

The clue is not that price failed to fill immediately. It is whether the market demonstrates acceptance. Look for sustained trading on the opening side of the gap, displacement through nearby liquidity, and retracements that respect bullish or bearish imbalances rather than fully reclaiming the prior RTH close.

How to use an RTH gap analysis indicator in your process

A useful RTH gap analysis indicator should remove chart preparation, not add another signal to interpret. At minimum, it should identify the prior RTH close, current RTH open, the gap range, and the session-specific context needed to keep those levels visible while price develops.

The workflow starts before the bell. Mark the daily and 4-hour draw on liquidity, identify where the current price sits within the active dealing range, then assess the overnight high and low. Only after that should you classify the RTH gap. A large gap against the higher-timeframe draw may be more likely to retrace than a modest gap aligned with it, but neither condition is enough to trade blindly.

At the open, let the first sequence reveal intent. If price runs overnight liquidity into the gap and then displaces back out, that can create a high-quality reversal framework. If price holds the open, raids a nearby intraday low or high, and continues with structure, the gap may be functioning as support or resistance rather than a destination.

During the session, keep the two gap boundaries on the chart. They can become useful profit targets, invalidation levels, or areas to reduce risk. A long entered after bullish displacement may use the RTH open as a nearby line in the sand. A short targeting a fill may scale before the prior RTH close if opposing liquidity or HTF support sits just ahead.

Build confluence without overbuilding the chart

The gap works best as one layer in a structured model. It does not need ten confirmations. In most cases, a directional premise, a liquidity event, and a lower-timeframe confirmation are enough to create a clear decision.

For example, suppose NQ opens with an upside RTH gap into a 4-hour premium array after taking overnight buyside liquidity. If the opening push fails, delivers bearish displacement, and leaves an IFVG on the retest, the prior RTH close becomes a logical draw. That is a defined short thesis with an objective reference, not a random attempt to fade green at the open.

Now flip the conditions. NQ gaps higher after a strong daily expansion, holds above the RTH open, and uses a shallow five-minute FVG to continue higher. In that case, forcing a short toward the prior close ignores acceptance and the prevailing order flow. The untouched gap is information, not an obligation.

Session settings can change the data

RTH gap analysis depends on accurate session definitions. A chart configured with the wrong exchange time zone, an inconsistent symbol, or extended-hours settings that do not match your model can create levels that look precise but are not relevant to your trade.

This is particularly important when comparing futures and cash indices. ES futures trade overnight, while the SPX cash index follows different hours. Both can be useful, but they are not interchangeable. Decide which instrument and session definition your execution model uses, then keep it consistent in your journaling and replay work.

Holiday schedules, half days, and major economic releases also deserve extra caution. A gap after an abnormal session may carry less statistical value than a standard weekday open. The same is true when overnight news creates a fast repricing that overwhelms normal opening behavior.

Automation should preserve discretion

The point of automating RTH levels is not to turn gap trading into a mechanical button press. It is to clear repetitive chart work so you can focus on price delivery, risk, and execution.

Toodegrees uses purpose-built TradingView tools to keep those session references visible alongside the rest of an ICT/SMC workflow. That matters when your chart already needs to account for HTF structure, SMT, liquidity, FVGs, and time-based models without becoming unreadable.

Use the gap as a reference you can trust, then make the trade only when the market gives your model the right conditions. The cleanest RTH analysis does not predict every opening move. It helps you recognize faster when price is honoring, filling, or leaving behind the level that matters.