XAUUSD Explained: How Gold Trades Around the Clock

XAUUSD is the market symbol for the price of one troy ounce of gold quoted in US dollars. "XAU" is the standard currency-style code for gold and "USD" is the US dollar, so a quote of XAUUSD at 2,400.50 means one ounce costs $2,400.50. It trades almost continuously from Sunday evening to Friday evening (New York time), which is why it is a favourite for automated trading systems that can watch it at every hour.

This guide explains how XAUUSD is quoted, who trades it and when, what moves the price, and what that means if you plan to trade it with rules or a bot.

Where the name and the quote come from

Why gold has a currency code

Gold has been treated as money for most of recorded history, and the international standard for currency codes (ISO 4217) gives it its own code, XAU. The "X" prefix is used for things that are not a national currency, such as precious metals. Silver is XAG, for example.

Because gold sits in this currency system, brokers quote it like a currency pair. XAUUSD works like EURUSD: the first item is what you are buying or selling, and the second is what you pay with. Buying XAUUSD means buying gold with dollars. Selling it means selling gold for dollars, which you can do even if you hold no gold, through a contract with your broker.

How a XAUUSD quote works

Every quote has two prices:

• Bid: the price you can sell at.
• Ask: the price you can buy at.

The difference is the spread, and it is the broker's main charge on many accounts. If the bid is 2,400.20 and the ask is 2,400.50, the spread is 30 cents an ounce. Spreads usually widen when markets are thin, such as late on Friday or around major news releases.

Lots and contract size

Most MT5 brokers trade gold in lots. A common standard is that one lot equals 100 ounces, with mini and micro lots for smaller sizes, but contract specs differ between brokers, so always check yours.

An illustrative example, using made-up round numbers:

• Gold price: $2,000 an ounce
• Position: 1 lot of 100 ounces, so $200,000 of gold exposure
• Price move: up $10 to $2,010
• Result: a $1,000 gain if you bought, a $1,000 loss if you sold

With leverage, that $200,000 position might need only a few thousand dollars of margin. This is why small price moves can produce large account swings, and why careful sizing matters so much. Our post on risk per trade in gold trading covers how bots size positions.

XAUUSD vs other ways to own gold

XAUUSD contracts are only one way to get exposure to the gold price. Each has different costs and trade-offs.

Notice that Big Tech Trend and Steady Growth, two of the AlgolaneBots strategies, hold the GLD fund at times. That is gold exposure through the stock market. Gold Breakout, by contrast, trades XAUUSD directly through MT5.

When XAUUSD trades: the three sessions

Gold trades around the world as the business day moves from Asia to Europe to North America. Traders loosely divide the day into three sessions:

1. Asian session. Trading centres in Asia, including major physical gold markets. Often quieter, with narrower price ranges.
2. London session. London has long been a centre of the global gold market, and activity and volume usually rise when it opens.
3. New York session. US economic data and the US futures market add volume. The overlap of London and New York is often the busiest part of the day.

There is typically a short daily break in trading and a weekend closure. Exact times vary by broker and shift with daylight saving changes. The practical point: gold can move a lot while you are asleep, and a price can "gap" from Friday's close to Sunday's open if something happens over the weekend.

What moves the gold price

Gold pays no interest and has no earnings, so its price is driven by supply, demand and how people feel about alternatives. Widely recognised influences include:

• The US dollar. Because gold is priced in dollars, a stronger dollar often (not always) coincides with a weaker gold price, and the reverse.
• Real interest rates. When interest rates after inflation are high, holding a non-paying asset like gold is less attractive. When they are low or negative, gold tends to look better.
• Fear and uncertainty. In crises, some investors buy gold as a perceived safe haven, though gold can also fall during sharp sell-offs as investors raise cash.
• Central bank buying and selling. Many central banks hold gold reserves, and their purchases can be large.
• Jewellery and industrial demand. Important for physical markets, especially in large consumer countries.

For how gold has behaved in stock market crashes, see gold vs the S&P 500 in crashes.

News that moves XAUUSD fast

Scheduled US releases often cause sharp short-term moves: interest rate decisions, inflation figures and jobs reports among them. Spreads can widen and orders can fill at worse prices than expected during these moments. Any gold bot should be tested with realistic costs for this reason; see paper trading slippage and costs.

Why gold suits rule-based bots

Several features of XAUUSD make it a natural fit for automated trading:

• Near-continuous hours. A bot can check the market every hour without anyone staying awake.
• Two-way trading. Rules can profit from falls as well as rises by selling short.
• Clear quiet and active phases. Gold often alternates between tight ranges and strong moves, which breakout rules try to exploit.
• Deep liquidity. Gold is one of the most heavily traded markets in the world, so normal-size retail orders usually fill easily outside news spikes.

The same features carry risks. Leverage magnifies losses, overnight moves can jump past stop levels, and frequent trading piles up costs. A bot does not remove these risks; it just applies the same rules to them every time.

How AlgolaneBots's Gold Breakout uses XAUUSD

Gold Breakout checks XAUUSD every hour. It waits for the price to go quiet, then trades a breakout in the direction of the long-term trend, buying or selling short. A stop-loss follows the price, and trades close at a profit target or when momentum fades. The breakout logic is explained in gold breakout strategy.

It runs through an Expert Advisor in your own MetaTrader 5 terminal, connected with a one-time token. You choose risk per trade of 1%, 2%, 3% or 5%. During the free trial it works on demo accounts only, and the MT5 route is not offered in India or sanctioned countries. Paper trading of Gold Breakout works everywhere.

What this means when you test a gold bot

Because XAUUSD trades through most of the week, a gold bot's results depend on details that matter less for a once-a-day stock strategy. When you look at any gold bot, including on paper, a few questions help:

• Which hours does it trade? A strategy that often enters during thin hours may face wider spreads than a test assumed.
• Does it hold over the weekend? Weekend holds carry gap risk and extra financing charges.
• How does it handle news? Some bots pause around major releases; others trade straight through them.
• What contract size does your broker use? The same "0.10 lots" can mean different amounts of gold at different brokers.

None of these questions has a single right answer, but knowing them in advance makes it much easier to tell whether a bot is behaving as designed or whether something about your broker's setup differs from the test. Our MT5 Expert Advisor guide covers where to find your broker's contract settings in the terminal.

Common XAUUSD misunderstandings

• "XAUUSD is the same as owning gold." It is a contract with your broker. You do not own metal, and you depend on the broker's terms.
• "The price is the same everywhere." Prices across brokers are close but not identical, and spreads differ.
• "Stops always fill at the stop price." In fast markets or over weekend gaps, a stop can fill worse than its level.
• "Holding overnight is free." Leveraged positions usually carry daily financing charges, often called swaps.

Key takeaways

• XAUUSD is the price of one ounce of gold in US dollars, quoted like a currency pair with a bid, an ask and a spread.
• It trades nearly 24 hours on weekdays across the Asian, London and New York sessions, with a weekend closure.
• Leverage means small price moves can create large gains or losses; lot sizes and contract specs vary by broker.
• The dollar, real interest rates, fear and central bank demand are among the main forces on the price.
• Gold's hours and two-way trading suit bots, but costs, gaps and leverage remain real risks.

Nothing here is personal financial advice. See our risk disclosure.

Watch XAUUSD trade on paper

The quickest way to get a feel for how XAUUSD moves is to follow a rule-based strategy through it. Start a free 90-day trial and run Gold Breakout on a $10,000 paper account with real prices. No card is needed.