When you add a credit card to your Paperspace account, you might see a charge of $1 on your credit card's pending charges.
This is a verification charge that confirms your credit card is in good standing and allows you to make purchases on Paperspace. You will never actually get charged this $1. Depending on your credit card company, the payment will be released in 5-10 days.
You are required to have an active and valid credit card on Paperspace that will cover your Paperspace balance. Paperspace may issue verification charges at our discretion through the month.