Spreads liquidity and forex market sessions

Learn why the price you can trade can differ from the chart, and why execution conditions change through the day.

A quote has two sides

The bid is the price at which a quoting dealer or order book is prepared to buy the base currency. The ask is the price at which it is prepared to sell it. A customer buying the base currency normally pays the ask. Selling normally receives the bid.

For a hypothetical EUR/USD quote of 1.1000 bid and 1.1002 ask, the spread is 0.0002 dollars per euro, or two conventional pips. Buying 10,000 euros and immediately selling them at unchanged quotes produces a 2 dollar loss before commissions or other charges.

A chart may not be an executable offer

A chart might display the midpoint, the bid, the last transaction or an indicative reference. Its timestamp and source matter. A quoted price can also be available only for a limited size. A larger order may receive several prices as available liquidity is consumed.

When comparing providers, record both sides of the quote at the same time and for the same instrument. A narrow advertised minimum spread is not the same as the average spread available when you need to transact.

Sessions change participation

Currency activity follows business hours across Asia, Europe and the Americas. Overlapping centres can bring more participants, but no clock interval guarantees a low cost fill. Daylight saving changes, local holidays and instrument opening hours complicate simple session labels.

The broader FX market operates across much of the business week. Retail access depends on the provider. Around weekends, maintenance periods or exceptional events, trading may be unavailable and the next available price may differ substantially from the last displayed quote.

Liquidity can disappear when it matters

An economic release can change prices before an order reaches an available counterparty. Spreads can widen as uncertainty increases and liquidity providers adjust their quotes. A historically liquid pair can still experience poor execution during a stressed interval.

Keep a simple execution journal with time zone, order size, bid, ask, fees and final fill. This turns a vague impression that a market is cheap into evidence about the actual conditions faced. Do not assume the costs observed in calm hours apply to every situation.

Check your understanding

A pair shows a one pip spread during ordinary hours and six pips around an announcement. Which spread belongs in a simulation that enters at the announcement?

See the answer

The simulation should use realistic conditions for that announcement window, including a plausible wider spread and slippage. Using the calm period spread would understate execution costs.