To purchase additional skip trace credits:
Go to your Account Settings.
Click on the Skip Trace Credits tab.
Click the purple Purchase Credits tab. A popup window will appear where you can choose your amount and complete the purchase.
Here you will also see your history of skip trace packages that you have purchased or received. If you are on a Standard Plus or Team plan, your account will get 100 free skip trace credits every month. These expire each month, and will be refreshed on the 1st of each month. If you have purchased any skip traces, they do not expire and you will have access to them until you use them all.
Click on View Usage to see the specific properties that skip traces have been run on.