Your contract defines the usage limits. You can check your monthly Eureka utilization to avoid exceeding the limit.
To see the current situation, navigate to Reports > Usage Analytics.
You can see the number of Searches, Search Suggestions, and Category Visits your users have made under the Eureka API Request Volume.
You can refer to Eureka Usage Measurement to better understand the usage calculation.
Eureka Overall Analytics and Eureka API Request Volume Analytics count searches are different. In Overall Analytics, each search is counted once, no matter its length. However, in the Request Volume Analytics, every character in a search is counted separately. For example, "red skirt" counts as one search in Overall Analytics but nine in the Request Volume Analytics, one for each letter.