ZEC order book heatmap
Resting orders over time on Binance, Bybit, OKX and Hyperliquid. Brighter means more USD at that price.
How to read an order book heatmap: five things, in order
Each one builds on the last. The pictures use the map's colours: bids green under the white mid line, asks rose over it.
The grid: time × price
Each column is one step of time; each row is one price bin. Read left to right for the timeline and up and down for distance from the white mid line. Zoomed out, or on long windows, neighbouring bins merge so each row stays visible, and the footer says by how much.
Brightness is resting USD
A cell is the USD of limit orders resting in that bin at that time, added up over the exchanges you have on. Brightness climbs slowly through the common sizes and fast at the top, so ordinary depth stays dim and the largest orders light up. One scale covers the whole map, and both its ends are capped: the smallest cells share the faintest shade, the largest the brightest. The USD per bin slider hides the smaller or the larger cells.
Bids below the line, asks above
Bids are green and sit under the white mid line; asks are rose and sit over it. With Pro, Layers can paint the map in one colour instead, or hide a side. The map draws no combined best bid and best ask: across exchanges, one exchange's best bid can sit above another's best ask.
A band is orders that stayed
A horizontal band is orders that rested at one price over time. It ends for one of three reasons: price traded through it, the orders were cancelled, or the level left the feed's reach. Where the white line crosses the end, price traded there; where it does not, the orders were cancelled or the feed stopped reaching that far.
Orders resting as far as each exchange's feed reaches
Each exchange sends only the part of its book nearest the price. On BTC and ETH that is a narrow band around the price; on smaller coins it is wider. Dark outside the band means the feed does not reach there, not that the book is empty.
What every element on the map means
One card per element, including the ones the legend does not name.
Cell
Everywhere on the mapThe USD of orders resting in one price bin at one moment. On the 15m window that moment is one live update; on longer windows a cell holds the most each exchange had in the bin during the step, added up. Hover a cell for its USD, its price range and how far it is from mid.
Mid line
White, across the mapHalfway between the highest bid and the lowest ask at each step; on longer windows, the average over the step. On the free map it is taken across Binance, Bybit and OKX. With Pro it is taken across the exchanges you have on, and Layers can draw one line for each exchange in its colour instead, or hide the line.
Last-price tag
On the price axisThe mid price at the right edge of the view: at the live edge, the latest one. It is the mid, not the last trade. With Pro, Layers can hide it.
Colour scale
FooterThe USD per bin at the dim end and at the bright end of the scale, set from the cells on the map. Next to it: the price span of one row and, when bins merge, how many bins each row holds. The USD per bin slider in the toolbar runs along the same scale; its limits show here, and every cell outside them is left out.
Exchange chips
Toolbar · ProSwitching an exchange off removes its orders from every cell; at least one stays on. In Layers, the Venue colour paints each bin in the colour of the exchange with the most USD there. Free shows all four together.
Hyperliquid
Exchange chip, on by defaultIts book comes in coarser price steps than the other three, so its orders are cut to the price band the other selected exchanges reach. With Pro, its chip turns it off; shown alone, it is not cut.
Coverage strip
Footer · ProOn windows from 1h: teal where the archive covers the window, rose where it has a gap of over a minute, grey before the archive began. Beside it: the archive's first day, how many gaps fall in this window and Hyperliquid's share of the archived USD. A gap is missing data, not an empty book.
Last 15 minutes
Footer · FreeThe free map shows the last 15 minutes as soon as the page opens: the time before you opened it in 5-second steps, the time since once a second. A tab hidden for more than 15 seconds stops updating, and the time away is filled in, in 5-second steps, when you come back. When the label shows less than 15 minutes, part of that time is missing: our live feed restarted in the last 15 minutes, or it paused for a while.
Freshness dot
Right end of the toolbarGreen: the live edge updated in the last 5 seconds. Amber: the feed has gone quiet, and the map keeps what it last got. Grey: waiting for the first update.
Full method
How the book is combined, binned and archived, and what the map cannot show.
Order book heatmap methodology →Frequently asked questions
What does an order book heatmap show?
Resting limit orders by price over time, in USD. Time runs left to right and price bottom to top; the brighter a cell, the more USD of orders rested there. This map combines Binance, Bybit, OKX and Hyperliquid.
Is the order book heatmap free?
Yes. The free map shows the last 15 minutes as soon as the page opens and then updates once a second. Its USD per bin slider hides the smaller or the larger bins. Pro adds windows from 1 hour to 30 days, each exchange on its own, layers and CSV export.
How often does the map update?
The live edge updates once a second. The 15 minutes before you opened the page are shown in 5-second steps, and Pro windows reach back as far as 30 days.
How is Hyperliquid shown?
Hyperliquid is on by default. Its book comes in coarser price steps than the other three exchanges, so its orders are cut to the price band the other selected exchanges reach. With Pro, its chip turns it off.
What do the dark areas mean?
Outside the band of orders, dark means no data: the feed does not reach that price, or the archive has a gap there. It does not mean the book is empty. Inside the band, a dark cell is a price where no orders were resting at that time. The smallest sizes are drawn only faintly, so the large orders stand out; hover a cell for its exact USD. A cell is also dark when the USD per bin slider leaves it out, or, with Pro, when it holds only a side you hid in Layers.