Iceberg Orders on Hyperliquid: Finding Hidden Size in Order Book Refills

A resting order for 1,344 units sat on the AR book at 2.7113 today. It got eaten. Then it came back at the same price, at the same size, three times in a row. That is not a market maker adjusting quotes. That is somebody working a large order and refusing to show how large.

Iceberg orders exist because size moves price. A trader who needs to fill 5 million dollars does not post 5 million dollars, they post 200,000 and replace it every time it clears. The refill pattern is the tell, and it is visible in order book snapshots if you keep state between them.

Crypto Order Book Imbalance Only Shows the Visible Part

Order book imbalance, depth charts, and heatmaps all measure what is displayed. That is useful, and it is also exactly what a large participant is trying to distort. The order that matters is the one being fed into the book in slices, and by the time you see it on a static snapshot it looks like an ordinary quote.

The only way to separate a refill from a normal quote is memory. A single snapshot shows a level with size on it. Two snapshots show whether that size was consumed. Ten snapshots show whether it keeps regenerating at the same price after being consumed, which is the behavior no ordinary resting order exhibits.

The Hidden Liquidity Radar keeps that state across snapshots for 102 symbols, tracking each price level, how much size has been absorbed there, and how many times it has reappeared.

How Refill Detection Works on Snapshot Data

The mechanics are straightforward once the state exists. For each tracked level the engine records the size seen, the size that disappeared between snapshots, and whether new size appeared at the same price afterward. A level that drops from 1,344 to zero and returns to 1,344 counts as one refill. Ten refills at the same price with cumulative absorbed notional is a different animal entirely.

Confidence combines two things: how many times the level has refilled, and how much notional has been absorbed there in total. Both matter. A level that refilled twice for 400 dollars is noise. A level that refilled nine times while absorbing six figures is a working order.

Levels are dropped from the display after 15 minutes without activity. Hidden orders are not permanent fixtures, and a stale level says more about where someone was working an hour ago than where they are now.

The state itself is capped and rolls forward, so a level that keeps working accumulates history while abandoned ones fall out. What survives is a short list of prices where somebody has repeatedly chosen to stand, which is a much smaller set than the hundreds of quotes visible on the book at any moment.

Absorption Is a Price Level, Not a Direction

A refilling bid means somebody is buying every time the market offers, but it does not mean price goes up. It means price has a floor at that level until the hidden order is done. The trade is the reaction when it finishes, not the fact that it exists.

The practical read is simple. A refilling bid beneath price is support that will hold longer than the visible book suggests, and it explains why a level keeps rejecting without any obvious reason on the chart. A refilling ask above price is the ceiling nobody can see, and it is often why a breakout keeps failing on the same tick.

Both flip. When a level that has been absorbing for 40 minutes stops refilling and price pushes through, the hidden order is either filled or pulled. That transition, from absorbed to cleared, is where the move usually starts.

That is also the cleanest way to use the panel. Rather than trading the presence of hidden size, mark the level and wait for it to stop defending. A bid that absorbed 400,000 dollars across nine refills and then disappears has either finished its work or given up, and in both cases the barrier that was holding price is gone.

The failure mode to avoid is treating a refilling level as a free entry. Standing in front of a large working order is fine until the order is done, and you rarely get told when that happens.

What Snapshot Data Cannot See

This is built on L2 order book snapshots taken roughly once a minute, not on a raw tape. That boundary matters and is worth stating plainly.

Fast icebergs that refill in under a second appear as a single stable quote and get missed entirely. Two separate traders replacing size at the same price look identical to one trader working an order. And size that trades away between snapshots without a refill is counted as absorbed even when the quote was simply pulled.

For confirmation, the tick level iceberg detector on individual pair views works off the trade feed rather than snapshots and catches the fast ones. The Radar is the cross market scan that tells you where to look; the pair view tells you what is actually happening there.

Scanning the Whole Board at Once

The Hidden Liquidity Radar runs at buildix.trade/screener/hidden-liquidity, listing active refill levels across the tracked universe ordered by confidence, with side, distance from mid, absorbed notional, refill count, and time since the last refill. It is a Whale tier panel, next to the iceberg detector and tape speed tools.

Most traders read the book as a photograph. The information is in the difference between photographs, and almost nobody keeps the previous one.