Sampling plan
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| Window | Samples | Why |
|---|---|---|
| London open | Multiple days | Liquidity transition |
| London/New York overlap | Multiple days | Active flow |
| US data/HMR | Event samples | Stress widening |
| Rollover | Multiple days | Holding/liquidity cost |
| Sunday reopen | Multiple weeks | Gap/thin market |
Data columns
Timestamp/timezone, account, symbol suffix, Bid, Ask, volume, cash spread, round-trip commission, swap/admin fee, account currency, conversion and observed slippage.
Fair comparison
- Keep symbol/volume identical.
- Capture accounts within seconds.
- Exclude stale/disconnected quotes.
- Calculate cash values.
- Separate median and worst-decile cost.
- Compare with strategy target/stop.
Decision metric
Use cost as a share of expected gross edge and planned loss. The lowest median spread may not win if commission or stress slippage is larger.
Payment/currency factor
Report results in the intended account currency and separately estimate funding conversion. Do not let a small spread saving hide a recurring conversion cost.
Official references
Dynamic/stable spread explanation · Calculator limitation and inputs
Frequently asked questions
How many samples are enough?
Use enough across ordinary and stress windows to see a distribution, not one quote.
Should I compare pips only?
No. Convert to cash and add commission/holding/conversion.
Why record connection state?
A stale quote invalidates the comparison.
What is the best account?
The one with lowest robust all-in cost for the actual strategy, not a label.