The Crypto Orderflow Glossary: 40 Terms Every Perp Trader Should Know

Orderflow analysis has a vocabulary problem: the concepts are learnable in an afternoon, but the jargon is scattered across futures forums, academic papers, and Discord slang. This glossary defines the 40 terms that matter for crypto perp trading in plain language, grouped into four families: traded flow, the order book, derivatives mechanics, and market microstructure. Each definition is self-contained, so the page works as a reference you return to.

What Are the Core Traded-Flow Terms?

Delta is the difference between market buy volume and market sell volume over a bar or window. Positive delta means aggressors bought more than they sold.

CVD (Cumulative Volume Delta) is delta summed over time into a running line. It tracks who has been on the offensive: rising CVD means sustained aggressive buying. The full guide lives at buildix.trade/blog/cvd-divergence-trading-strategy-step-by-step-guide-2026.

CVD divergence occurs when price and CVD disagree, for example price making a new high while CVD does not. It flags moves that lack aggressive participation.

Bucketed CVD splits CVD by trade size so retail flow and whale flow are tracked as separate lines instead of one blended number.

Footprint chart displays the buy and sell volume traded at every price inside each candle, turning a candlestick into a grid of who did what, where.

Imbalance on a footprint marks a price level where aggressive buys outnumbered aggressive sells (or the reverse) by a large multiple, typically 3 to 1 or more.

Absorption is heavy aggressive volume hitting a level while price refuses to move, evidence that passive orders are eating the attack. It often precedes reversals.

Exhaustion is the opposite ending: aggressive volume dries up as a move extends, leaving the trend without fuel.

Volume profile is the distribution of traded volume across price over a session or range, showing where the market did business.

POC (Point of Control) is the single price with the most traded volume in a profile, the session's fairest price by participation.

VAH and VAL (Value Area High and Low) bound the zone containing roughly 70% of traded volume, the market's accepted range.

Naked POC is a prior session's POC that price has never revisited. These act as magnets and feature in our strategy guide at buildix.trade/blog/naked-poc-trading-strategy-volume-profile-guide-2026.

TPO (Time Price Opportunity) profiles time spent at each price rather than volume, the Market Profile view of the same auction.

What Are the Order Book Terms?

Bid and ask are the highest resting buy price and lowest resting sell price; the spread is the gap between them.

Depth is the total resting size across levels on each side of the book. DOM (Depth of Market) is the ladder display of that data.

Order book heatmap plots resting depth across price and time with brightness encoding size, showing walls forming and vanishing.

Wall is an unusually large block of resting orders at one level. Walls are information only if they hold under test.

Spoofing is placing large visible orders with no intention of execution, pulling them as price approaches, to herd other participants.

Iceberg is the mirror trick: real size hidden so only a sliver is visible, refilling repeatedly at the same price while heavy volume prints.

Sweep is a single aggressive order large enough to clear multiple levels of the book at once, the signature of urgency.

OBI (Order Book Imbalance) is the ratio of bid depth to ask depth near the touch. Persistent imbalance tilts short-term odds and is a core Buildix signal.

OFI (Order Flow Imbalance) measures changes in the book, additions, cancellations, and executions at the best levels, capturing pressure that pure depth snapshots miss.

What Are the Derivatives Mechanics Terms?

Perpetual future (perp) is a futures contract with no expiry, kept near spot by funding payments.

Funding rate is the periodic payment between longs and shorts that anchors the perp to its index. Positive funding means longs pay shorts, a proxy for crowding.

Open interest (OI) is the total value of outstanding contracts. Rising OI means new positions opening; falling OI means closing. It cannot be wash-traded, which is why it is the honest activity metric.

Basis is the gap between perp (or dated future) price and spot, the raw material of cash-and-carry trades.

Liquidation is the forced close of a position whose margin fell below maintenance. A liquidation cascade is a chain of them, each fill triggering the next.

Liquidation heatmap is a modeled map of where leveraged positions would be force-closed, built from OI and margin assumptions.

ADL (Auto-Deleveraging) is the last-resort mechanism where profitable traders are forcibly closed to offset a bankrupt counterparty when the backstop is exhausted.

Long/short ratio counts accounts or positions on each side. It is noisy and frequently misleading, which is why book-based measures like OBI usually beat it.

Max pain is the options strike where the most open contracts expire worthless, sometimes acting as a mild magnet into expiry.

HLP is Hyperliquid's community liquidity vault that backstops liquidations and market-makes, absorbing what the book cannot.

What Are the Microstructure Terms?

Market order takes liquidity at the best available price; limit order rests in the book and provides it. Taker and maker fees mirror the two roles.

Slippage is the difference between expected and executed price, the cost of demanding liquidity.

Market impact is how much your own order moves the price, the institutional version of slippage.

Kyle's Lambda measures price change per unit of net order flow, a formal gauge of market impact and book fragility. Explained fully at buildix.trade/blog/kyles-lambda-crypto-market-impact-indicator-explained-buildix-2026.

VPIN (Volume-Synchronized Probability of Informed Trading) estimates the share of flow coming from informed traders. Elevated VPIN historically precedes volatility.

Flow toxicity is the market-maker term for that informed flow, order flow that costs the passive side money.

TWAP and VWAP execution slice large orders across time or volume to reduce impact; on the tape they appear as steady, rhythmic prints.

Aggressor is the side that crossed the spread on a trade. Every orderflow metric ultimately reduces to tracking who aggressed, where, and what happened next.

FAQ

What is the single most important term to master first? CVD. It compresses the aggressor story into one line and most other flow concepts build on it.

Which metric is hardest to fake? Open interest, because every dollar of it requires posted margin. Volume can be farmed; OI cannot.

Where can I see these metrics live? The Buildix deep view at buildix.trade/pair/BTC streams CVD, OBI, OFI, VPIN, volume profile, funding, OI, and liquidations for 530+ pairs, free tier included.

Vocabulary is the cheapest edge in trading: every term here is a question you no longer have to ask mid-trade.