BinaryOptionRanking symbolBinaryOptionRanking
GlossaryMarkets & assets

Bid-ask spread

The difference between the current bid and ask prices. It can explain small differences between broker charts and external market displays.

Binary options glossary definition visual
Direct answer

Where this term appears

This term may appear in the asset list, chart header, market schedule, symbol information, price-source note, or contract history. Match the symbol and timestamp before comparing it with an external chart.

Use the definition above together with the exact value, condition, timestamp, account, product, or payment context shown by the broker.

Do not confuse

How Bid-ask spread differs from related terms

Bid-ask spread is often researched beside Ask price and Mid-price and Last traded price. The labels can appear in the same workflow, but they do not describe the same field or condition.

01
Ask price

The lowest quoted price at which the referenced instrument can currently be bought. Check whether a broker uses the ask, bid, midpoint, or another quote for charts and settlement.

02
Mid-price

The value halfway between the current bid and ask prices. Platforms may use it for charting, strike selection, or settlement.

03
Last traded price

The price of the most recently reported transaction on a venue. It can differ from the current bid, ask, midpoint, or mark price.

Practical use

Connect every displayed price to its source and timestamp

Bid-ask spread means the difference between the current bid and ask prices. It can explain small differences between broker charts and external market displays. Chart, entry, strike, barrier, and settlement values can come from different steps in the workflow. A price is auditable only when the instrument, source, quote side, timestamp, precision, and correction policy are known.

A neutral example

Capture the value before confirmation, the accepted entry or reference tick, the final settlement value, and an external reference at the same UTC time. Explain expected spread or methodology differences instead of demanding identical pixels.

01
Source

Named venue, provider, benchmark, or documented proprietary calculation.

02
Timestamp and side

UTC time, bid, ask, midpoint, last trade, mark, or another stated basis.

03
Exceptions

Missing ticks, filtered quotes, outages, fallback source, rounding, and correction process.

In a broker review

How to use Bid-ask spread in a comparison

In a broker review, do not read Bid-ask spread in isolation. Match the broker's own definition to the relevant contract, account, pricing, payment, or platform screen and record the condition that changes its meaning.

Comparison context

Why it matters when comparing brokers

How to use this term

Asset count is meaningful only when the underlying market, price source, trading hours, and weekend or after-hours treatment are clear. Separate real-market references from broker-priced OTC instruments and proprietary synthetic markets.

What it does not prove

A recognizable asset name does not guarantee that two brokers use the same market venue, bid/ask basis, trading session, or settlement price source.

Broker checklist

What to verify

Check these points on the broker's product screen, account flow, terms, or help pages.

01
Underlying market

Confirm the underlying instrument, currency pair, index, commodity, stock, or crypto reference.

02
Market-data source

Look for a named venue, provider, benchmark, or clearly explained proprietary model.

03
Trading availability

Check regular sessions, weekends, holidays, maintenance, and after-hours availability.

04
Market type

Distinguish real-market, OTC, derived, and synthetic symbols before comparing coverage.

Quick answers

Common questions

Short answers for users comparing binary options brokers and account conditions.

What is Bid-ask spread commonly compared with?

Bid-ask spread is commonly compared with Ask price. Ask price means: The lowest quoted price at which the referenced instrument can currently be bought. Check whether a broker uses the ask, bid, midpoint, or another quote for charts and settlement.

Why does this term matter when comparing brokers?

Asset count is meaningful only when the underlying market, price source, trading hours, and weekend or after-hours treatment are clear. Separate real-market references from broker-priced OTC instruments and proprietary synthetic markets.

What should I check when comparing this feature?

A recognizable asset name does not guarantee that two brokers use the same market venue, bid/ask basis, trading session, or settlement price source. Check the broker's definition, applicable terms, and account or product screen before relying on the label.