# Liquidity Provider > A participant that quotes two-sided prices and stands ready to trade against incoming orders, compensated by the spread for carrying inventory risk and adverse-selection risk. - Canonical: https://hadalinstruments.com/glossary/liquidity-provider/ - Term set: https://hadalinstruments.com/glossary/ --- Somebody is on the other side of every fill. A liquidity provider is a participant whose business is to be there routinely: quoting a bid and an offer, accumulating inventory it did not choose, and earning the difference between the two prices in exchange. The spread is that compensation, and it pays for two distinct risks. The first is inventory risk — having bought, the provider holds a position it must unwind, and the market may move first. The second is [adverse selection](/glossary/adverse-selection/): a disproportionate share of arriving orders come from participants who know something, so the provider is filled most reliably at the moments being filled is worst. Every widening of a quoted price is a repricing of one or both, which is why [spread widening](/glossary/spread-widening/) clusters around scheduled events and thin sessions. Obligations differ by venue, and the difference matters. On some exchanges a designated market maker carries quoting obligations with specified maximum spreads and minimum sizes, enforceable by the venue. In over-the-counter markets — foreign exchange most prominently — provision is voluntary: nothing obliges a provider to keep quoting, which is precisely why depth can drain into a [liquidity void](/glossary/liquidity-void/) at the moment it is most wanted. Structure also decides who the client's counterparty actually is. Where an order is passed to an external provider, the broker's interest and the client's are broadly aligned. Where the broker is itself the provider, the client's loss is the broker's revenue, and the handling of the order becomes the territory of [dealing-desk intervention](/glossary/dealing-desk-intervention/) and [last look](/glossary/last-look/). ## Why it matters Marketing materials like to count providers — *access to N liquidity providers* — and the count is not a measurable property of anything a client receives. What is measurable, from records a trader already holds, is behaviour: [fill ratio](/glossary/fill-ratio/) conditioned on market drift, rejection asymmetry, and how quoted spreads move through events. Structure claims are cheap; execution records are evidence. ## Commonly confused with Neighbouring concepts that get used interchangeably, and the distinction that actually separates them. - **Your broker** — Sometimes the same entity, sometimes not, and the difference decides whose interest your order serves. Where an order is passed to an external provider, the broker's interest and yours are broadly aligned. Where the broker is itself the provider, your loss is its revenue. - **Designated market maker** — On some exchanges a designated maker carries quoting obligations — maximum spreads, minimum sizes — that the venue can enforce. In over-the-counter markets, foreign exchange most prominently, provision is voluntary. Nothing obliges a provider to keep quoting, which is why depth can drain at the moment it is most wanted. - **Liquidity itself** — A provider is a participant; liquidity is what reaches you. The two come apart precisely when it matters, which is why a count of providers describes an arrangement rather than a quantity you receive. - **[Adverse selection](https://hadalinstruments.com/glossary/adverse-selection/)** — Adverse selection is one of the two risks the spread compensates, not a description of the provider. Understanding that a provider is filled most reliably at the moments being filled is worst explains most of the behaviour that otherwise reads as hostility. ## 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** — Your own execution records: fills and rejections with timestamps, the quotes standing at those moments, and quoted spreads through scheduled events. None of this requires the venue's cooperation or its disclosure about who it routes to. - **What you compute** — Fill ratio conditioned on which way the market drifted, rejection asymmetry across that same direction, and how quoted spreads move through events compared with a reference. Behaviour, in other words, rather than architecture. - **What the answer tells you** — Structure claims are cheap and execution records are evidence. Marketing that counts providers — access to some number of liquidity sources — is not making a measurable claim about anything a client receives; a fill population that behaves symmetrically across drift is. Where the two disagree, believe the records. ## Questions and answers ### Does "access to 20 liquidity providers" mean I get better prices? The count is not a measurable property of anything you receive, so on its own it tells you very little. What is measurable, from records you already hold, is behaviour: fill ratio conditioned on market drift, rejection asymmetry, and how quoted spreads move through events. A structure claim is an assertion; an execution record is evidence. ### Who is actually on the other side of my trade? Who is on the other side depends on the arrangement, and it is worth establishing which one you are in. Your order may be passed to an external provider, in which case your broker's interest and yours broadly align, or your broker may itself be the provider, in which case your loss is its revenue. The second is where order handling starts to matter a great deal. ### Why do spreads widen exactly when I most want to trade? Because the spread is compensation for two risks that both spike at the same moments. Inventory risk — the position the provider must unwind may move against it — and adverse selection, since a larger share of arriving orders come from participants who know something. Widening is a repricing of both rather than a reaction to you. ### Is a provider obliged to keep quoting? A provider's obligation to keep quoting depends entirely on the venue. Designated market makers on some exchanges carry enforceable obligations with specified spreads and sizes. In over-the-counter FX, provision is voluntary — which is the structural reason depth can disappear into a void during exactly the conditions that make depth valuable. ## If this has already cost you What reaches you is measurable from your own records; how many providers sit behind it is not a property you can verify. - [Feed Fidelity Assay](https://hadalinstruments.com/assays/#feed-fidelity-assay) “Is the feed my terminal shows me behaving consistently?” Will not establish: A verdict on your broker. One exported log from one terminal measures your feed as you received it — venue-side behaviour, other account tiers and intent are all outside what this data can carry. Intake is not open yet, so none of these can be commissioned today. They are listed here so you know the measurement exists and what it would and would not settle — the [launch list](https://hadalinstruments.com/pricing/#waitlist) hears first. ## Related terms Derived from the links this entry makes and the entries that link back to it. - [Adverse Selection](https://hadalinstruments.com/glossary/adverse-selection/) The systematic tendency to transact precisely when the counterparty knows something you do not — filled when the market is about to move against you, missed when it would have moved in your favour. - [Dealing-Desk Intervention](https://hadalinstruments.com/glossary/dealing-desk-intervention/) Broker-side software or manual control that alters how client orders are handled between receipt and fill — added delay, requote thresholds, asymmetric slippage tolerance — on platforms where the broker is the counterparty to the trade. - [Fill Ratio](https://hadalinstruments.com/glossary/fill-ratio/) The proportion of order attempts that resulted in a trade, read alongside what happened to the attempts that did not — how the market drifted during them, and at what price they were eventually replaced. - [Last Look](https://hadalinstruments.com/glossary/last-look/) A practice in over-the-counter foreign exchange in which a liquidity provider, after receiving an order against its quoted price, retains a final window in which to accept or reject the trade. - [Liquidity Void](https://hadalinstruments.com/glossary/liquidity-void/) A moment in which resting orders are withdrawn faster than they are replaced, leaving stretches of the price axis with nothing to trade against, so that price traverses them in near-vertical jumps. - [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. - [Spread Widening](https://hadalinstruments.com/glossary/spread-widening/) A transient expansion of the bid-ask spread beyond its typical range, most commonly around scheduled news releases, liquidity transitions, and session rollovers. ## Cite This Definition APA BibTeX HTML Hadal Instruments. (2026). Liquidity Provider. Hadal Glossary. https://hadalinstruments.com/glossary/liquidity-provider/ Version 2b360a7, 2026-08-28. @misc{hadal_2026_liquidity-provider, author = {Hadal Instruments}, title = {Liquidity Provider}, year = {2026}, url = {https://hadalinstruments.com/glossary/liquidity-provider/}, howpublished = {Hadal Glossary}, version = {2b360a7}, note = {Pre-launch publication; version dated 2026-08-28} } Source: Hadal Instruments, Liquidity Provider. Original Research Copy Citation **Version 2b360a7** 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/).