Define Raw Spread before you verify it
Raw spread usually refers to the transaction cost component expressed as the difference between the quoted ask and bid prices, often shown separately from commissions. Verification starts with definition: confirm whether a source means only the price difference, or also includes provider fees/commissions in the displayed number.
A reliable explanation should state the measurement unit (for example, pips or points), the quote convention (how bid and ask are defined), and whether the number is presented “as quoted” versus “as executed.” If those details are not stated, you cannot fully verify the claim because the same label can refer to different underlying calculations.
Build a source hierarchy to reduce ambiguity
Use a simple hierarchy: (1) primary mechanics documentation, then (2) fee/commission documents, then (3) observed quote data from trading interfaces, and finally (4) third-party commentary.
- Mechanics and terminology: platform or broker documentation that defines the spread display and how it is computed.
- Costs other than spread: commission schedules, minimum charges, or any additional adjustments that affect total execution cost.
- Data provenance: where the bid/ask figures come from (for example, quote feed timing and whether there is any smoothing).
- Observed execution: sample fills that show what you actually received versus what was displayed at the moment you submitted.
When you verify information, treat “raw spread” as a component within total cost. Your goal is to confirm the component’s definition and its linkage to other cost elements.
Use reproducible verification steps (no real-time data required)
Follow steps you can repeat with the same assumptions.
- Record the exact inputs. Choose one instrument (currency pair), one trade direction (buy/sell), and define the time window you will use (for example, a specific minute). Write down bid and ask values from the stated source, plus the stated units.
- Compute the raw spread from the definition. If raw spread is defined as (ask − bid), calculate it for each observation. If the source uses points instead of pips, convert using the instrument’s stated scaling rules.
- Add other known costs separately. If the provider adds commission, convert commission into the same cost basis used for your calculation (for example, per lot). Do not assume commission is already included in “raw spread.”
- Check consistency across displays. Compare the computed spread to what the interface reports during your chosen window. Differences can happen if displayed values are delayed, rounded, or derived from a different time stamp than execution.
- Repeat with at least two conditions. Use two different times or two different market-liquidity situations. This helps confirm whether the definition holds even when quoted spread widens or narrows.
If you can complete these steps and your computed values align with the documented definition, the information about raw spread is verifiable under your stated assumptions.
Material limitations and failure modes to expect
Even with careful checks, verification can fail for predictable reasons:
- Provider-dependent definitions: one source may label (ask − bid) as raw spread, another may include fees, or use different rounding.
- Quote-versus-execution mismatch: displayed bid/ask may not match fill prices due to latency, slippage, or order-book dynamics.
- Time-window confusion: “during the session” averages versus single-snapshot values are not interchangeable.
- Unit and conversion errors: pips/points conversions vary by instrument. Missing conversion details can make “verified” numbers meaningless.
Historical comparisons also have limits: a past relationship between quotes and execution costs does not guarantee future results. Market conditions, execution quality, and jurisdiction-specific practices can all change over time.
Verification checklist and the next question to ask
To verify information about raw spread, confirm (a) what is included (price difference only or plus fees), (b) the units and conversion rules, (c) the time reference for the numbers, and (d) how displayed quotes relate to executed prices.
If any of those elements are missing, treat the claim as partially unverified rather than “confirmed.” A good next question is: what exactly is the stated formula and time reference for the displayed raw spread, and does the documentation describe how it maps to fill prices?