On-Balance Volume
Accumulates volume according to whether price closes up or down.
Start with the input, not the story.
Directional participation using the platform's available volume series.
Plain-language formula
Platform implementations can differ in price input, smoothing, indexing and rounding. Record the exact settings and provider before comparing results.
Where it may help
Breakout confirmation research when feed-specific tick volume is understood.
Where it struggles
Spot FX is decentralised, so retail platforms usually show tick volume rather than total market volume.
Add a different measurement.
A complementary tool should answer a different question, such as volatility, regime or position risk. Test the base rule before testing the combination.
The shortcut to avoid
Calling broker tick volume the complete global FX volume.
A testable next step
Keep the same broker feed and test whether the feature adds value beyond price alone.