Single prints and gaps are not the same thing, but they often appear in the same place—price moves quickly through an area, leaving very few or even just one TPO (Time Price Opportunity) trading there. Single print areas are "likely" to be retested, but "retested" does not mean "filled," and not all gaps get filled. The probability of a retest depends on the nature, size, and location of the gap.
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Step 1: Identify What Type of Single Print You're Looking At
Single prints appear in different parts of the market profile structure, and their meaning varies significantly.
Case A: Single print inside the day's profile (not at the highest or lowest edge of the price range). This type represents "inefficient pricing"—the market moved through the area so fast that almost no volume accumulated there. According to market profile theory, these areas are highly likely to be retested or even filled later, because the market needs to confirm whether those price levels are "fair."
Case B: Single print at the extreme edge of the price range (a single TPO near the day's high or low). This is closer to a "tail"—a level where the market tried to test an extreme but was quickly rejected. These single prints have a lower probability of being filled because they represent true rejection zones, not areas that were simply "skipped over."
Completion Criteria
You can tell whether the single print you're looking at is an "internal gap" or an "edge tail."
Step 2: Use Historical and Quantitative Data to Assess Fill Probability
The idea that "gaps always get filled" is a widely spread myth, and the data does not support it.
What to do: Refer to historical gap-fill probability statistics instead of blindly believing that every gap must close.
How to do it: According to publicly available historical data, the probability of a gap being filled within one week is about 48%, within two weeks about 61%, and within three weeks about 78%. However, some gaps never get filled. Gap size is a key factor—small gaps have a very high fill rate, while large gaps (far from the average price) see their fill probability drop sharply to around 11%–38%.
Completion criteria: You know whether your gap falls into the "high probability of filling" category or the "may never fill" category, rather than treating all gaps the same.
Step 3: Use Single Print Retest Signals for Trading Decisions, Don't Just Wait for the Gap to Fill
The real value of a single print is that it provides a "structural reference point," not a "mandatory to-do item."
What to do: Treat the single print area as a support or resistance reference, not as a level that price must eventually return to.
How to do it: When price retests a single print area, watch the candlestick reaction. If price shows a clear rejection signal near the zone boundary (such as a high-volume rejection or breakout), then act. If price drifts sideways through the single print area, it means the zone has already been "accepted" or "repaired" by the market and no longer holds reference value.
Completion criteria: You made your decision based on actual price behavior at the single print zone, not because you placed a pending order in advance just because "it hasn't filled yet."
Common Reasons for Failure
Believing that "gaps must fill" and placing a reversal order at the gap level ahead of time. If this is a breakout gap (for example, price rapidly leaves a range due to major news), it may not fill for months or even years. The orders waiting for the gap to fill end up becoming fuel for the breakout move.
In the crypto market, single prints and gaps do not carry the same statistical "must fill" expectation found in traditional stock markets. Crypto trades 24/7, so there are no true "opening gaps." Most so-called "gaps" are actually traces left by liquidity voids or wicks. Don't apply the traditional stock market mindset of "every gap must be filled" to cryptocurrencies—the underlying logic is fundamentally different.
How to Verify Your Understanding
Open a Bitcoin daily chart and find three areas you consider to be clear single prints. Observe whether they were later retested and how price reacted during the retest. If at least two of those areas showed at least one clear rejection when retested, then this reference technique is working effectively for you.
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Next Steps
Add single print areas to your key level list, alongside support and resistance levels and volume control points. When price approaches these areas, switch to a smaller timeframe to observe price behavior. Only act when a clear signal appears on the smaller timeframe (such as a high-volume breakout or a pin bar)—do not place pending orders in advance just to wait for the gap to fill.
