Rounding Top pattern

What is a Rounding Top?

A rounding top is a gradual turn from rising to falling prices. Rallies shrink, price drifts sideways near its highs, and then declines lengthen until price breaks below the floor of the formation. There are no clearly separate peaks as in a double top or a head and shoulders; the turn is spread over many bars.

Behind the curve is slow distribution. Larger holders sell into strength a little at a time, so each push higher meets more supply and achieves less. Buyers keep arriving, but with less conviction, and the market grows complacent near the highs. When price slips below the support beneath the dome, recent buyers are underwater and their selling adds to the decline. PatternX trades the rounding top short, so acting on it needs a market and account where shorting is possible. Its bullish mirror image is the rounding bottom.

Anatomy of the Rounding Top

Think of a rounding top as five phases followed by a breakdown:

1. Advance: the uptrend that gives the pattern something to reverse.
2. Deceleration: up legs get shorter, upper wicks appear and bars overlap more.
3. Crest: a broad, choppy stretch where highs stop rising, the peak of the dome.
4. Roll-over: lower highs and gradually larger down legs.
5. Right lip: price returns toward the level where the dome started.
6. Breakdown: a close below the support beneath the dome.

Two measurements matter. The support level is the floor of the formation, the line that has to give way; in PatternX's version it is the lowest low of the whole base. The depth is the distance from the lips up to the crest, and it sets the measured move projected downward from the breakdown.

A dome is judged by its curvature and balance: the two sides should take broadly similar time, and the crest should be rounded rather than a single spike.

How to identify a Rounding Top

Use this checklist on a suspected dome. These are general practices; PatternX's precise rules are in the detection section.

1. Confirm a prior advance, ideally an extended one.
2. Look for fading momentum: smaller up legs, more overlapping bars, failed pushes to new highs.
3. Identify the crest: a broad, flat peak rather than one sharp high.
4. Check the right side for lower highs that roughly mirror the left side's rise.
5. Compare the lips. The dome should start and end at similar prices.
6. Mark support at the floor of the formation.
7. Note volume, which often thins near the crest.
8. Wait for a close below support, not just an intrabar dip under it.
9. Check the practicalities of shorting: borrow availability for stocks, funding for perpetual futures, and whether short trades are enabled in your settings.

One quick test: compare the time spent on each side of the crest. A market that rose for weeks and fell for two days has printed a spike, not a rounding top.

Confirmation

The breakdown below support confirms the rounding top. Until then, a crest in an uptrend is often just a pause, and a strong market can turn a dome into a sideways range and then a new advance. Shorting early in an uptrend is expensive when it goes wrong.

Signs that strengthen the breakdown: volume expands as support breaks; the higher timeframe is also losing upward momentum; and a bounce back to the broken level fails to reclaim it, turning old support into resistance. PatternX's breakdown level is the lowest low of the entire 45-bar base, so a signal requires price to undercut every bar of the formation, a deeper break than a line across the dome's lips would require.

Invalidation

The bearish read fails when:

• Price pushes to a new high above the crest; the dome was a pause within the uptrend.
• A breakdown reverses quickly back above support, trapping short sellers.
• The right side flattens into a range instead of continuing lower.

For a short, the structural stop sits above the formation: PatternX uses the base's highest high plus a 0.2% buffer, unless your own stop-loss percentage is tighter. There is no invalidation logic after a signal or trade opens, so that stop is the exit if the breakdown fails. A short squeeze can carry price through it quickly, so expect slippage in fast markets.

Volume

Textbook volume on a rounding top is less tidy than on a bottom. Volume often peaks during the earlier part of the advance, thins out as the crest forms and enthusiasm fades, and then rises as the decline gathers pace and support breaks. Some analysts accept quieter breakdowns at tops, on the idea that prices can fall simply because buyers step away.

PatternX does not make that exception. It has no rounding-specific volume rule, and the universal check still applies: the breakdown bar needs at least 1.2× its 20-bar average volume. A quiet slide through support therefore produces no signal.

Common false signals

Rounding tops fail in ways that are specific to short trades:

• Shorting a consolidation. In a strong uptrend, flat crests often resolve upward.
• Short squeezes. When shorts are crowded, a breakdown can reverse violently; on perpetuals, deeply negative funding is one warning sign.
• Breaking into support. A breakdown on a lower timeframe that lands on major higher-timeframe support has little room to fall.
• Event gaps. An earnings beat or macro surprise can gap a stock straight through the stop.
• Mistaking a range for a dome. A sideways market with one high in the middle is not a rounding top.

To reduce these, short only when the higher timeframe is weakening, check funding and crowding, avoid entries just before scheduled events, and size positions so a squeeze is a contained loss. Trying your settings on shorts in simulation first is sensible, and PatternX starts every connection in paper trading mode.

Market context

Rounding tops matter most after extended advances, particularly when momentum has been fading for a while, when leadership is rotating away from the sector, or when the higher timeframe is starting to flatten. They are also more practical in markets where shorting is liquid and inexpensive.

They are least dependable in strong bull markets, where domes are frequently pauses before the next leg, and around major catalysts. PatternX does not check the prior trend for this pattern, so a dome that forms after only a modest rise can still trigger a signal; confirming a real, extended advance first is up to you, while the score's trend-alignment factor reflects the EMA backdrop.

In crypto markets

In crypto, rounding tops are usually traded through perpetual futures, which make shorting straightforward but add funding costs and liquidation risk. Positive funding while the dome forms shows longs paying to stay in; when support breaks, forced selling from liquidated longs can accelerate the drop.

Wicks above the crest, often from stop hunts, set the base's highest high, which is PatternX's structural stop, so one spike can place that stop far above the entry. Because markets never close, a breakdown can happen at any hour, including thin weekend sessions, and the same level can break on one exchange before another. Crypto symbols need at least $3M of 24-hour volume before PatternX signals them. See perpetual futures pattern trading.

In stocks, ETFs and FX

Shorting stocks requires a margin account and shares available to borrow, and borrow costs can change while the trade is open. Earnings and macro releases can gap a stock through support overnight, completing the pattern at a price well below the level, or gap it back above the crest against a short.

In FX, shorting is symmetric: selling one currency means buying another, so bearish patterns are as practical to act on as bullish ones. Breakdowns during the London and New York overlap usually see more participation than those in quiet hours. PatternX's risk engine lets you disable short trades entirely, and US traders should mind the pattern day trader rule on intraday round trips.

Timeframes

Like its bullish mirror, PatternX's rounding-top detector judges a fixed 45-bar base on every timeframe, so the dome's duration in clock time depends on the chart: 11¼ hours on the 15-minute chart, 7½ days on the 4-hour chart and 45 bars on the daily. Intraday domes are more frequent and noisier; daily domes reflect broader distribution but take weeks to complete.

PatternX scans eight timeframes from 1m to 1d, and its higher-timeframe check reads the next timeframe up. Domes spanning many months on a weekly chart are outside its view, and a dome much longer than 45 bars is judged only on its final 45, which usually look like a decline rather than a dome.

Example: the logic step by step

For example, consider a hypothetical altcoin perpetual on the 4-hour chart, traded short. The numbers are invented.

The means rise and then fall, the lips are well inside 5% of each other and the crest clears the 4% minimum. With the platform defaults, the 5% stop-loss sits at 58.80, much tighter than 64.93, so it is used; the 10% take-profit at 50.40 is farther than 50.75, so the measured move is used. Risk is 2.80 and reward 5.25, about 1.9 to 1.

Notice that the stop comes from the percentage, not the structure: a 5% bounce would close the trade while the dome was still intact.

How PatternX detects the Rounding Top

The rounding-top detector is the bearish twin of the rounding bottom. It takes the 45 bars before the latest bar as the base, divides them into five 9-bar blocks and averages each block's closing prices.

• Shape: the block means rise into the middle block and then fall.
• Level lips: first and last blocks within 5% of each other.
• Height: the middle block at least 4% above the lips' mean.
• Breakdown: a fresh close below the base's lowest low on the latest bar, with the previous close not already below it. The latest bar may still be forming.
• Stop: the base's highest high. Target: entry minus the distance between the middle block and the lips' mean.

Because this is a short signal, the universal filters read in the other direction:

• The breakdown candle must finish below its open.
• Its volume must be at least 1.2× the 20-bar average.
• ATR must be at least 0.05% of price, the liquidity score at least 30 and the spread no wider than 0.25%.
• Order-book imbalance against the short, meaning bids outweighing asks, must be no worse than −0.5.
• Crypto symbols need at least $3M of 24-hour volume; broker-connected instruments are exempt.

No prior-uptrend check and no volume-shape check apply. Methodology: pattern detection.

How PatternX Classic evaluates it

PatternX Classic scores a rounding top with the same 13-factor PatternX Score it uses for longs, read in the short direction. On perpetual futures, the funding (3% of the weight) and open-interest (2%) factors add derivatives context. Trend alignment compares EMA20 and EMA50 with a short, so a dome that has only just rolled over may score lower there. A fixed prior for the pattern is part of the score; it is not a measured statistic.

The confidence must reach your minimum (default 65); categories run from Weak (below 50) through Medium and High to Elite (80+). As with the rounding bottom, the base's far extreme is always farther from the entry than the measured target, so the pattern clears 1:1 only when a percentage stop is the tighter one. Unapproved signals expire after 15 minutes, and if short trades are disabled, the risk engine will not place the order.

What PatternX AI adds

With PatternX AI on Pro or Elite, a rounding top that Classic has already detected and accepted gets a second, context-based look; the AI layer cannot detect or invent patterns. Its 8 fixed factors are read in the short direction: trend strength (EMA12 against EMA26), market structure (whether the last three swing highs and lows within 60 candles agree with a short) and momentum (RSI(14) in the trade's direction). Sentiment uses only the perpetual-futures funding rate, so it is neutral for stocks and FX.

If the weighted context score is below 48, or structure scores under 35 while momentum is under 40, the setup is vetoed; otherwise its confidence is re-weighted. Pro accounts in AI mode are limited to 5 trades a day. See the Classic vs AI comparison.