# Order flow > The stream of orders arriving at a market — aggressive orders consuming resting size and passive orders posting it — and, by extension, the discipline of reading that stream from book and tape data. - Canonical: https://hadalinstruments.com/glossary/order-flow/ - Term set: https://hadalinstruments.com/glossary/ --- Order flow is the family name, and half its trouble is that the family's poorest relations borrow it most. Used precisely, the term names the stream itself: orders arriving at a market — the aggressive ones crossing the spread to consume resting size, the passive ones posting, revising and withdrawing it — and everything a market's price does is downstream of the meeting between those two populations. The discipline built on the term is the measurement of that stream from recorded data, and this glossary carries its instruments one by one: [cumulative delta](/glossary/cumulative-delta/) signs and sums the aggression; the [footprint chart](/glossary/footprint-chart/) keeps its per-price ledger; [order flow imbalance](/glossary/order-flow-imbalance/) measures the pressure of arrivals and cancellations on the book; [depth of market](/glossary/depth-of-market/) and [quote fade](/glossary/quote-fade/) watch the resting side's promises and betrayals; and the [absorb/sweep](/glossary/absorb-sweep/) balance names the meeting itself at the touch. The precision matters because the term travels without its measurements. The [smart money](/glossary/smart-money-concepts/) school speaks fluently of order flow while working from candle geometry alone — no book, no tape, no per-trade record — and the borrowed authority is the point of the borrowing: *flow* sounds measured. The distinction this entry exists to hold is not a snobbery about schools but a checkability line: a flow claim that traces to recorded book or tape data under stated conventions can be verified by a second person; one inferred from candle shapes is an interpretation, whatever vocabulary it wears. Both may be interesting. Only one is a measurement. Anything marketed as order flow trading should be read against that line — the phrase spans both practices, and which side a given tool or course sits on is answered by asking what data it actually reads. The family's shared caveat applies at the root: in over-the-counter FX there is no consolidated stream. Every flow measurement is a measurement of somebody's slice — one broker's book, one aggregator's tape — and honest tooling names its feed the way this site's own [tick provenance](/glossary/tick-data-provenance/) discipline demands. And the family's shared boundary applies too. The measurements are real, reproducible, and frequently beautiful; whether any of them predicts price at a horizon anyone can trade is a separate question per instrument, per convention, per venue — answered in evidence under the [two lenses](/glossary/the-two-lenses/), never by the resonance of the word *flow*. ## Commonly confused with Neighbouring concepts that get used interchangeably, and the distinction that actually separates them. - **[Order flow imbalance](https://hadalinstruments.com/glossary/order-flow-imbalance/)** — The imbalance is one measurement extracted from the flow — the net of arrivals, cancellations and executions pressing on the book. Order flow is the stream itself; the imbalance is a statistic computed over it, one of several this family defines. - **Volume** — Volume is the flow's least informative summary: everything that traded, unsigned and unplaced. The flow vocabulary exists precisely to recover what volume discards — side, aggression, location and sequence. - **[Smart money concepts](https://hadalinstruments.com/glossary/smart-money-concepts/)** — The SMC school uses "order flow" for inferences drawn from candle geometry alone — no book, no tape, no per-trade data. Used precisely, order flow names measurements of recorded market data; the borrowed usage keeps the vocabulary and drops the measurements. - **Tape reading** — The older craft name for the same instinct: watching prints for size, pace and insistence. Modern order-flow tooling is tape reading with recorded data and stated conventions — the difference is not the idea but the checkability. ## How to measure it in your own data A definition you cannot test is a definition you have to take on trust. This is the shortest honest route from the concept to a number you computed yourself. - **Records you need** — Recorded per-trade data and order-book updates — prices, sizes, sides, timestamps — from an identified feed, since OTC FX has no consolidated stream and every flow measurement is a measurement of somebody's slice. - **What you compute** — The family's instruments, each with its own entry: aggressor-signed sums (cumulative delta), per-price transaction ledgers (footprint), book-pressure statistics (order flow imbalance), resting-size behaviour (depth of market, quote fade), and the absorb/sweep balance at the touch. - **What the answer tells you** — Order flow is not one signal but a layer: the tell is whether a claimed "flow" reading traces to recorded book or tape data under stated conventions. Where it does, one of this family's instruments is at work; where it does not, the term is decorating an inference made from candles. ## Questions and answers ### What is order flow in trading? The arriving stream of orders — aggressive ones crossing the spread and consuming resting size, passive ones posting and withdrawing it — and the discipline of measuring that stream from tape and book records. Every instrument in this glossary's microstructure family is a lens on some part of it. ### Is order flow trading the same as ICT order flow? No. The ICT and smart-money usage infers "flow" from candle shapes without book or tape data — a legitimate school with its own entries here, but a different object. Precise usage reserves the term for measurements of recorded market data under stated conventions. ### What data do you need to read order flow? Recorded per-trade prints and book updates from an identified feed. In spot FX that identification is not pedantry: with no consolidated tape, flow measurements are feed-relative, and two books can tell different stories about the same minutes. ### Does order flow analysis work? Its measurements are real — delta, imbalance, depth behaviour are all computable and reproducible. Whether any of them predicts price at a tradeable horizon is instrument-by-instrument, convention-by-convention, and measured rather than assumed; this family's entries each state that boundary for themselves. ## Related terms Derived from the links this entry makes and the entries that link back to it. - [Absorb/Sweep](https://hadalinstruments.com/glossary/absorb-sweep/) A microstructural market dynamic where limit orders (absorption) interact with aggressive market orders (sweeping) across multiple price levels, defining liquidity transition phases. - [Cumulative delta](https://hadalinstruments.com/glossary/cumulative-delta/) The running sum of buyer-aggressed minus seller-aggressed volume — one line tracking which side has been crossing the spread harder, accumulated trade by trade. - [Depth of market (DOM)](https://hadalinstruments.com/glossary/depth-of-market/) The visible ladder of resting limit orders — how much size is bid and offered at each price level away from the touch — as one feed displays it at one moment. - [Footprint chart](https://hadalinstruments.com/glossary/footprint-chart/) A candle opened up: per price level within each bar, the volume that traded — usually split by aggressor side — so the bar shows not just where price went but who paid to move it. - [Order block](https://hadalinstruments.com/glossary/order-block/) The last candle closing against the direction of a subsequent qualifying move — taught as the footprint of positions built before the move, and drawn as a zone expected to react on revisit. - [Order Flow Imbalance (OFI)](https://hadalinstruments.com/glossary/order-flow-imbalance/) A measure of net buying pressure constructed from changes at the top of the order book — additions, cancellations and executions on each side, netted over an interval. - [Quote Fade](https://hadalinstruments.com/glossary/quote-fade/) The withdrawal or repricing of a displayed quote in the moment an order arrives against it, so that the liquidity a trader aimed at is not the liquidity that is there on arrival. - [Smart money concepts (SMC)](https://hadalinstruments.com/glossary/smart-money-concepts/) A retail methodology label for reading charts through claimed institutional behaviour — market structure, liquidity pools, imbalances and premium-discount ranges — largely systematised from the ICT teachings. ## Cite This Definition APA BibTeX HTML Hadal Instruments. (2026). Order flow. Hadal Glossary. https://hadalinstruments.com/glossary/order-flow/ Version b31c44d, 2026-08-30. @misc{hadal_2026_order-flow, author = {Hadal Instruments}, title = {Order flow}, year = {2026}, url = {https://hadalinstruments.com/glossary/order-flow/}, howpublished = {Hadal Glossary}, version = {b31c44d}, note = {Pre-launch publication; version dated 2026-08-30} } Source: Hadal Instruments, Order flow. Original Research Copy Citation **Version b31c44d** identifies the commit that last changed this page in Hadal's content repository. That repository is not public, so the identifier does not resolve externally — it is published so a citation pins one specific state rather than a moving page. To obtain the exact version cited, use the [press and research route](https://hadalinstruments.com/press/).