Why is my invoice $0.00?

Invoices are generated on last day of the month, for the current month (i.e. your invoice covering 1st Jan to 31st Jan will be generated on the 31st Jan). Your invoice will detail spend in the month across all of the zones that were live on your account.

Bytio charges for usage and standing (time-based) charges per-minute and deducts those amounts from your account balance each minute. Your monthly invoice states “Amount Due: $0.00” because the charges have already been deducted from your account balance, per-minute, throughout the month as they were accrued.