@大宮 僚馬 Thanks for reaching here! After conducting an internal discussion with the Product Group, we have determined that there is presently no method available to track the quantity of semantic search requests within a specific month.
However, we have placed this as a work item in our backlog, and it is our intention to elevate this to a primary feature that will be made accessible to our customers in the future.
In the meantime, when the free semantic threshold is passed the system does throw an error message noting that the free count has been exceeded.
Hope this helps.