Ninja Number - Why is there a $1.50 charge on my credit card transactions?

When you sign up for Ninja Number, you may notice a charge and a credit of $1.50 on your credit card transactions. This is a temporary preauthorization from your credit card company to let us know that the credit card is valid. Shortly after the amount appears, the credit card company zeros it out, meaning that you will owe nothing on your final statement. Your free trial is still free!