The exchange rate visible on a chart is not necessarily the price available to a particular trader. The spread and execution conditions determine how much of a market move can actually be captured.
The underlying mechanism
The bid is the price at which a provider will buy the base currency; the ask is the price at which it sells. The difference is the spread. Commission, overnight financing, currency conversion charges and slippage add to the effective cost.
The spread is the difference between a dealer’s offer and bid for a currency pair. It is a price cost, not necessarily the only trading fee. FOREX.com’s US account disclosure distinguishes spread-only pricing from a RAW account where variable spreads coexist with a per-side commission.
How to evaluate it in practice
Compare total trading costs at the same trade size and holding period rather than a single advertised minimum spread. Ask for timestamped execution records, which instruments are covered by quotations, and whether costs widen during major releases or thin liquidity.
If an EUR/USD pair is quoted hypothetically at 1.10000 bid and 1.10015 ask, the spread is 0.00015—or 1.5 pips under a 0.0001 pip increment. For 100,000 EUR that is about USD 15 of instantaneous quoted spread cost before slippage. These are invented arithmetic inputs, not broker quotes.
Common mistakes and limits
A tight quoted spread is not a promise of that spread at execution. Backtests using mid-market prices but ignoring costs can give misleading results, especially for strategies targeting small price moves.
The advertised minimum spread is not an observed typical spread or a guarantee for a given order. The US FOREX.com cost page also shows why commissions, holding costs and account terms must be normalized before comparing providers.
An exercise for careful readers
Build a simple cost worksheet with quoted spread, commission, conversion, and financing. Test how the break-even movement changes when spreads double during a volatile interval.
Record time-stamped bid and ask observations in at least two trading sessions, then estimate gross spread cost for the same order size. Add entry and exit commissions separately and repeat under more volatile conditions to see why one promotional quote cannot decide suitability.
Continue your research
Explore the related topic hub, the risk warning and our editorial standards for additional context. External primary-source references appear below this article.
