look like the minimum charg will be 500 USD/EUR

this is an contract agreement from voxbone.com:
I would like to receive Voxbone's newsletter.
I have read and agree to the Voxbone Terms of Sale as may be updated from time to time.
I have read and accept the Legal & Service Restrictions associated with the services, that these restrictions may be updated from time to time and I agree to spend a minimum monthly recurring cost of USD/EUR 500 following my first order.
I have read and accept the Service Requirements.