Concerns About Debounce Email Validation Integration Results and Charges

I am using the integration of debounce as a tool to validate the emails I found. but so far it give me no results meaning 0 valid email and 0 other. If it basically provides me with nothing why does it charges me with credits? this is the table https://app.clay.com/workspaces/312137/tables/t_32QZuRYwpviH/views/gv_bdcetGFDq7nE