Crypto perpetual futures and options carry their own vocabulary, and the same word can mean different things across venues. This glossary is a neutral reference for the most common terms in perpetual-futures market structure, written to be accurate and free of hype. It is published by Athenum, a crypto and derivatives analytics terminal covering 14 exchanges, as an open educational resource.
Auto-Deleveraging (ADL)
Auto-deleveraging is a risk mechanism that closes part of a profitable, often highly leveraged trader's position to cover a counterparty whose position was liquidated but could not be filled in the market. It activates when the insurance fund is insufficient to absorb a bankrupt position's losses. ADL keeps the venue solvent without socializing losses across all accounts, but it can force a trader out of a winning position at the mark price without warning. Exchanges typically rank accounts by profit and leverage to decide ADL order.
Backwardation
Backwardation describes a market where futures or forward prices trade below the current spot or index price. It is the opposite of contango and often signals near-term selling pressure, hedging demand, or a perceived premium on holding the asset now. In perpetual markets, a persistently negative basis and negative funding rate reflect a backwardation-like condition. The shape can shift quickly as supply, demand, and sentiment change.
Basis
Basis is the difference between a derivative's price and the spot or index price of the underlying asset, usually expressed as a percentage. A positive basis means the contract trades at a premium to spot, while a negative basis means it trades at a discount. Basis reflects the cost of carry, funding conditions, and market positioning, and it tends to converge toward zero as a dated future approaches expiry. For perpetuals, basis and the funding rate are closely linked because both express the gap between contract and spot.
Contango
Contango describes a market where futures or forward prices trade above the current spot or index price. It commonly reflects the cost of carry, financing costs, and net long demand for leveraged exposure. In perpetual markets, a positive basis and positive funding rate indicate a contango-like state where longs pay shorts. Contango is a structural condition, not a directional forecast, and it can flatten or invert as conditions change.
Cross Margin
Cross margin is a collateral mode in which all positions in an account share a single pool of margin. Profits on one position can offset losses on another, which lowers the chance of an isolated liquidation but exposes the entire balance to a severe adverse move. Because the whole account backs each position, a single large loss can trigger liquidation across multiple positions at once. Traders use cross margin to improve capital efficiency at the cost of concentrated account-level risk.
Cumulative Volume Delta (CVD)
Cumulative volume delta is a running total of the difference between market buy volume and market sell volume over time. It is built from trade-by-trade data classified as aggressor buys or aggressor sells, then summed cumulatively. CVD is used to study whether market orders are net lifting offers or hitting bids, and divergences between CVD and price are often examined as a sign of absorption. Classification methods vary by data source, so CVD values are not always directly comparable across providers.
Funding Rate
The funding rate is a periodic payment exchanged directly between long and short holders of a perpetual contract, designed to tether the perpetual's price to the underlying spot or index price. When the rate is positive, longs pay shorts, which discourages an extended premium; when it is negative, shorts pay longs. The rate is usually derived from the basis between the contract and the index plus an interest component, and it is settled at fixed intervals such as every eight hours. Funding is paid between traders, not to the exchange, and it does not by itself predict price direction.
Implied Volatility
Implied volatility is the market's expectation of future price movement, derived by inverting an options pricing model from current option prices. It is quoted in annualized percentage terms and rises when demand for options protection or speculation increases. Higher implied volatility means more expensive options and a wider expected range, while lower implied volatility means the opposite. Implied volatility reflects expectations rather than realized movement, so it can differ from the volatility that actually occurs.
Index Price
The index price is a reference value for an asset, usually computed as an aggregated, weighted average of spot prices from several exchanges. It is designed to represent a fair market value that resists manipulation on any single venue. Perpetual contracts use the index price as an input to funding and to the mark price. Because it draws from multiple sources, the index price is more stable than the last traded price on one exchange.
Initial Margin
Initial margin is the minimum collateral required to open a leveraged position, expressed as a fraction of the position's notional value. It is the inverse of maximum leverage, so a five percent initial margin requirement corresponds to twenty times leverage. Initial margin determines how much exposure a given amount of collateral can support at entry. It is distinct from maintenance margin, which governs the position after it is open.
Insurance Fund
An insurance fund is a pool of collateral maintained by a derivatives venue to cover the shortfall when a liquidated position cannot be closed at or above its bankruptcy price. It absorbs losses that would otherwise fall on profitable counterparties, reducing the need for auto-deleveraging. The fund typically grows from liquidations closed at better than bankruptcy price and shrinks when it pays out shortfalls. A healthy, growing insurance fund is generally read as a sign of orderly liquidation conditions.
Isolated Margin
Isolated margin is a collateral mode in which a fixed amount of margin is assigned to a single position and cannot be drawn from the rest of the account. If the position moves against the trader, only the allocated margin is at risk, and liquidation is confined to that position. This caps the downside of any one trade but offers no cushion from the broader account balance. Traders use isolated margin to compartmentalize risk on individual positions.
Leverage
Leverage is the use of borrowed capital to control a position larger than the trader's posted collateral, expressed as a multiple such as ten times. It amplifies both gains and losses relative to the margin committed, so a small adverse price move can erase the collateral. Higher leverage narrows the distance between entry and the liquidation price. Leverage is a structural feature of margin trading rather than a strategy in itself.
Liquidation
Liquidation is the forced closure of a leveraged position when its margin falls below the maintenance requirement and the trader can no longer support the position. The venue's liquidation engine closes the position to prevent the account from going further into deficit. Liquidations are triggered against the mark price rather than the last traded price to reduce the impact of brief, isolated wicks. A liquidation realizes the loss and closes the position, with the liquidation engine submitting an order to the market to offload it.
Liquidation Cascade
A liquidation cascade is a chain reaction in which one wave of forced liquidations pushes price far enough to trigger further liquidations, which push price again. The feedback loop can move price sharply in a short window because liquidation orders add to the same directional pressure that caused them. Cascades are more likely when open interest is concentrated and leverage is high near similar price levels. They typically resolve once the clustered positions are flushed and liquidity returns.
Long/Short Ratio
The long/short ratio compares the number, size, or account count of long positions against short positions on a venue or across venues. It is published in several forms, such as the ratio of long to short accounts or of long to short position value, which can tell different stories. The ratio is used as a positioning and sentiment gauge rather than a direct price signal. Because methodologies differ, ratios from different sources are not always comparable.
Maintenance Margin
Maintenance margin is the minimum collateral that must be retained to keep a leveraged position open. If account equity for the position falls below this level, the position becomes eligible for liquidation. Maintenance margin is lower than initial margin, creating a buffer between opening a position and being liquidated. Venues often scale maintenance requirements upward for larger positions through tiered margin schedules.
Mark Price
The mark price is a fair value estimate used to calculate unrealized profit and loss and to trigger liquidations, rather than the last traded price. It is typically derived from the index price, with a funding-basis or moving-average adjustment, and exact mark price formulas vary by exchange, which insulates it from momentary spikes on a single venue. Using mark price for liquidations protects traders from being closed out by a brief, manipulated, or thin-liquidity wick. The mark price can differ from the last trade price at any given moment.
Max Pain
Max pain is the strike price at which the total intrinsic value of all outstanding options expiring on a given date would be smallest for option holders, equivalently the price at which the largest number of contracts expire worthless and option writers retain the most premium. It is calculated from open interest across all strikes for that expiry. The concept is used as a reference point around expiration, on the theory that price sometimes gravitates toward the level of maximum aggregate option holder loss. Max pain is a descriptive statistic, not a guarantee of where price will settle.
Open Interest
Open interest is the total number of derivative contracts that are currently open and not yet closed or settled, usually quoted in contracts, base units, or notional value. Rising open interest means new positions are being opened and fresh capital is entering, while falling open interest means positions are being closed. Open interest measures participation and committed exposure, and reading it alongside price helps distinguish new positioning from position unwinding. It is a stock of outstanding contracts, not a flow of volume.
Open Interest Heatmap
An open interest heatmap is a visualization that maps where open interest, or estimated leveraged positions, is concentrated across price levels. Color intensity indicates the density of positions or potential liquidation clusters at each level. It is used to study where forced closures might accumulate if price reaches certain areas. Because the underlying leverage and entry data are estimated, heatmaps from different providers can vary in their assumptions and appearance.
Order Book Depth
Order book depth is the quantity of resting buy and sell orders available at each price level away from the current best bid and ask. Deep books absorb large orders with little price movement, while thin books allow the same order to move price substantially. Depth is a snapshot of displayed liquidity and can change quickly as orders are placed, filled, or canceled. It does not reveal hidden or iceberg orders that are not fully displayed.
Options Skew
Options skew is the difference in implied volatility across options with the same expiry but different strike prices, most commonly comparing puts to calls. A skew toward higher put implied volatility indicates that downside protection is priced more richly than upside exposure, and vice versa. Skew is used to read the relative demand for hedging against up moves versus down moves. It describes the shape of the volatility surface and is not a directional prediction.
Perpetual Futures
A perpetual future is a derivative contract that tracks an underlying asset's price but has no expiry or settlement date, so a position can be held indefinitely while margin requirements are met. To keep the contract anchored to spot, perpetuals use a periodic funding payment exchanged between longs and shorts instead of converging to a settlement price. This structure lets traders take continuous leveraged long or short exposure without rolling contracts. Perpetuals are among the most actively traded instruments in crypto markets.
Term Structure
Term structure is the relationship between the prices or implied volatilities of contracts on the same asset across different expiration dates. An upward-sloping structure means longer-dated contracts carry a higher price or implied volatility, while a downward slope means the opposite. Term structure is used to read how the market prices time, carry, and expected future volatility. Its shape evolves as expectations and demand across maturities change.
Whale Walls
Whale walls are unusually large resting limit orders placed at a single price level, big enough to act as visible support below price or resistance above it. They can reflect genuine large-participant intent or be used to influence other traders' behavior, and they may be pulled before execution, a tactic associated with spoofing. Because displayed size can be canceled at any time, a wall is not a guarantee that the orders will be filled. Walls are studied alongside actual trade flow to gauge whether the displayed liquidity is real.
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