Your account will not be charged for using this function. You can get the results of the task within the next 30 days for free.
The cost can be calculated on the Pricing page.
OnPage API Force Stop
This endpoint is designed to force stop the crawl process of websites you specified in a task. The execution of all the tasks associated with the IDs indicated in your request to this endpoint will be stopped. You will still be able to obtain the data on pages that have been scanned until the crawling process was stopped.