What Is XAU (Spot Gold), and How Is Its Price Actually Set?

XAU is the ticker for one troy ounce of spot gold. Its benchmark price comes from the LBMA Gold Price, an auction run twice a day by ICE Benchmark Administration. Nearly every gold price quoted anywhere, a crypto exchange included, traces back to or benchmarks against that same twice-daily reference point.

That auction is not a single number someone announces. It runs in timed rounds until enough buyers and sellers agree on a price. That is why it can take anywhere from a handful of rounds to considerably more on a volatile day.

That gap between "there's an official fix" and "the price on my screen changes every second" is exactly where most confusion about spot gold starts.

Who actually sets that price, and how often

The LBMA Gold Price is set by ICE Benchmark Administration (IBA) through an electronic auction held twice a day, at 10:30 and 15:00 London time. Banks and bullion dealers submit buy and sell orders in 30-second rounds. The auction only ends once an algorithm finds a price where the imbalance between the two sides falls under a set threshold.

Here is how one round actually works. IBA publishes a starting price for the round. Every participant then has 30 seconds to enter, change, or cancel orders at that price. They state how many troy ounces they want to buy or sell. When the 30 seconds end, order entry freezes. The system then checks the imbalance between total buy interest and total sell interest. If that imbalance sits within the standard threshold of 10,000 troy ounces, the auction is done and the price is set. If it does not, the price adjusts and a new round begins (source: ICE Benchmark Administration, IBA Gold Auction Specification).

Most mornings the gold auction clears in about 5 rounds. The afternoon session typically runs 6 to 7 rounds. A genuinely volatile day can push that number higher, since the market simply needs more time to find a price both sides agree on (source: ICE, LBMA Gold and Silver Prices Questionnaire for Usage Licence Holders). Any leftover imbalance once the auction closes gets split evenly across the direct participants. Nobody is left holding an order that is never filled.

That whole process produces exactly two numbers a day, the AM fix and the PM fix. Gold itself changes hands far more often than twice a day. So what is everyone actually looking at the rest of the time?

Why gold has one global benchmark instead of many competing prices

Gold needs one broadly trusted reference price because a huge share of the market settles against a single published number instead of negotiating fresh terms every time. The LBMA Gold Price fills that role. It sits alongside two other ways "the gold price" gets quoted: a continuous dealer-to-dealer spot market, and an exchange's own tradeable index built for its product.

Industrial contracts, jewelry supply agreements, some ETF valuations, and other financial products that reference gold all use the LBMA fix for a simple reason. It is one number everyone can point to, set through a transparent, regulated process rather than whichever dealer happened to quote you first (source: World Gold Council, Gold Market Primer: Market Size and Structure). Without that shared reference point, every settlement, contract, and fund valuation would need its own negotiated price. That would be slower and harder to audit.

But that single fix is not the only place "the gold price" comes from. Three genuinely different things get called by that name, and it helps to see them side by side.

The first row is the anchor everyone references. The second and third rows are how that reference actually reaches a screen you can trade from. They work differently from each other, and it is worth understanding both before you act on either.

What happens between the twice-daily fixes

Between the two daily fixes, gold does not stop trading. It just stops being priced by that one official auction process. Bullion banks and dealers keep quoting each other continuously in the over-the-counter market. That continuous flow of dealer quotes is what most live gold prices you see anywhere are actually built from.

This over-the-counter market runs around the clock as a global market centered on London, with trading carried through overlapping sessions worldwide as one region hands off to the next. Wholesale price discovery for gold is close to continuous, even though the official fix only happens twice. Dealers are quoting each other constantly rather than waiting for the next fix. So the continuously-displayed price and the most recent LBMA fix will typically sit close together but rarely match exactly at any given instant. One is a live, ongoing negotiation. The other is a snapshot from however many minutes or hours ago. That is a normal feature of how spot markets work, not a sign that one number is wrong (source: LBMA, About Loco London).

This is also where a second acronym sometimes creates confusion. XAU refers to spot gold itself. It is not the same thing as XAUT, the ticker for Tether Gold. XAUT is a token whose own price can move independently of spot gold, based on the token's own supply and demand. If you are looking for how XAUT is backed and redeemed, that is covered separately in the what is Tether Gold guide rather than here. The rest of this article stays focused on the benchmark itself, not on any specific token.

So dealers are quoting continuously, and the official fix happens twice. An exchange that wants to offer a tradeable gold product still needs a price every second in between. That price has to come from somewhere.

How an exchange builds a tradeable price from that benchmark

An exchange that wants to offer a tradeable gold-referenced product needs a price every second, not twice a day. So it builds its own index from continuously-quoted vendor data rather than waiting on the next LBMA auction. BloFin's XAUUSDT reference index works exactly this way, constructed from constituent prices quoted by third-party data vendors.

BloFin's own listing documentation for XAUUSDT states plainly that its Price Index is built from constituent prices quoted by third-party data vendors. It also states that the index holds at its most recently calculated value if that external data ever goes quiet, rather than guessing at a number it cannot support (source: BloFin Help Center, BloFin Futures to List XAUUSDT). That single design detail explains a lot about how the number on your screen behaves once you actually watch it move.

Here is the mechanism in a normal, everyday scenario. Assume the vendor feeds behind BloFin's index are all reporting fresh quotes, which is the ordinary case during active trading hours. Spot gold shifts a little on continuous OTC flow. The vendor feeds updates to reflect that. BloFin's index then recalculates and moves along with it, within the vendors' own refresh cycle. Nothing about that path involves the LBMA fix directly. It involves the same continuous OTC pricing layer covered above, filtered through an index BloFin built and maintains for its own USDT-margined contract.

That single design choice, tracking vendor-quoted spot rather than the twice-daily fix directly, explains something else too. It is also why the index can occasionally hold still even while trading continues elsewhere, which is worth walking through on its own.

When the benchmark and an exchange's own quote can drift apart

An exchange's own index can drift from the underlying benchmark whenever the vendor data it depends on goes quiet. The index then holds at its last known value instead of guessing at a new one. That is a deliberate design choice, not a glitch, and it looks different from gold's price simply not moving on its own.

Picture a stretch where the vendor feeds behind BloFin's XAUUSDT index briefly stop returning fresh quotes, maybe during a data outage or in a thin overnight window. Spot gold itself might still be trading somewhere, on some OTC desk. But BloFin's index has no fresh input to work from, so it holds at the last calculated value until data resumes. Watching the chart, that looks identical to "gold just is not moving right now." The cause is different. One case is quiet in the market. The other is quiet in the data feed. The index is doing exactly what BloFin's own documentation, cited above, says it is built to do, rather than inventing a price it cannot support.

From BloFin's own product design, that frozen-value behavior is the safer failure mode. The alternative would be extrapolating a new number with no real data behind it. That would read as more "alive" on a chart but would actually be less trustworthy, since nothing would back that number up. The same listing documentation also notes that liquidity and price movement can be limited outside the primary gold market's regular trading hours. Order placement is sometimes restricted to reduce-only during those windows, for the same underlying reason: thinner data means more caution built into how the index behaves.

Once you know that pattern exists, a quote that briefly stalls is information, not a malfunction. It is a reasonable moment to check whether you are trading during a thin window, rather than assuming something is wrong.

Getting exposure to the XAU benchmark on BloFin

A reader who wants direct exposure to the XAU benchmark itself, rather than reading about how it is set, can trade BloFin's XAUUSDT perpetual. It tracks that spot benchmark rather than any single token. That makes it one of a few ways to get gold exposure on BloFin, alongside Tether Gold (XAUT) for anyone who specifically wants token-based exposure instead.

XAUUSDT is a USDT-margined perpetual with a contract size of 0.001 XAU, leverage up to 1-100X, and funding settled every 4 hours, 24/7. If leveraged derivatives are new to you, our guide to margin trading covers how margin and leverage work generally, before you size a position. The broader BloFin Futures guide covers order types and execution mechanics this article does not repeat.

But of course, not every reader wants leveraged exposure. Spot trading is worth understanding on its own terms, if you would rather hold a position without leverage at all, though this would only be applicable to XAUT (Tether Gold) instead of XAU. For a reader weighing gold specifically against Bitcoin as a store of value, that broader comparison lives in BloFin's Bitcoin vs Gold guide.

And if what you actually want is yield on a gold holding, rather than trading exposure to its price, that is a different product question. It is covered in BloFin's Tokenized Gold and Yield Opportunities piece.

Frequently asked questions

Is XAU the same thing as XAUT (Tether Gold)?

No. XAU is the ticker for spot gold itself, priced through the mechanism this guide covers. XAUT is Tether Gold, a token whose own market price can diverge from spot gold, based on the token's own supply and demand, separate from anything covered here. If you want the backing and redemption details for XAUT specifically, BloFin's Tether Gold guide covers that ground.

Why does the gold price I see look slightly different on different platforms at the same moment?

Because different platforms are often showing different things that all get called "the gold price." One might show a wholesale mid-market quote. Another might show a dealer's retail bid or ask. A third might show an exchange's own index value. All three can be legitimate at the same instant. They are just measuring slightly different points in the same underlying market, so a few dollars of difference is normal, not a sign one source is wrong.

Can I actually trade at the LBMA Gold Price myself?

Not directly. The auction itself is open only to IBA's registered participants, mostly large bullion banks and dealers acting as principals. Everyone else gets exposure through a product that references the benchmark instead, a futures contract, an ETF, an exchange-tradeable index, or physical bullion priced off the fix, rather than placing an order into the auction itself.

Does the LBMA Gold Price ever fail to get set on a given day?

It is designed not to. But IBA does hold contingency tools in reserve for a genuinely disrupted session, including widening the imbalance threshold, pausing an auction temporarily, or suspending it outright if conditions demand it. These tools exist precisely so a single day's disruption does not leave the market with no reference price at all. Invoking them is the exception, not the routine case.

Is spot gold the same as a gold futures price?

No. Spot gold is priced for immediate or near-immediate delivery. A futures contract is priced for delivery on a set future date, and can trade at a premium or discount to spot depending on interest rates and storage costs (source: Investopedia, Spot Price). The two track each other closely most of the time. But they are answering slightly different questions about when gold actually changes hands.

What happens to a gold-referenced quote outside normal market hours?

It can move less and trade thinner than during active hours, since the vendor data most exchange indices depend on reflects whatever liquidity exists in the underlying market at that moment. BloFin's own documentation for XAUUSDT notes exactly this pattern outside the primary gold market's regular hours. Orders are sometimes restricted to reduce-only during those windows, as a result.

Written by the BloFin Academy team, with AI-assisted drafting. Primary sources include ICE Benchmark Administration's own gold auction specification and licence-holder documentation, the LBMA's Loco London market guide, the World Gold Council's gold market primer, and BloFin's own contract listing documentation. Updated July 2026.

This article is educational content, not financial advice. Trading gold-referenced perpetual contracts with leverage carries risk of loss beyond your initial margin, and gold's historical pricing behavior does not predict future price movement. Consider your own risk tolerance and consult a qualified professional before opening a position.