Using the TickProvider API in SciChart WPF, you can have full control over tick labels on the chart, including knowing what tick labels the chart is going to draw.
Have a look at the TickProvider API documentation for guidance.
What you want to do is inherit NumericTickProvider (or the right TickProvider for your axis type) and override GetMajorTicks / GetMinorTicks. Calling the base method will tell you where ticks will be placed.
Let me know if this helps,
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