I have one space i pay $5/month for 250gb and 1 TB transfer. If i wanted more gb, would I be paying $0.02 per gb per month or is $0.02 per gb a one time payment
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Just like 5 USD per month, the extra charges for resource usage are charged monthly. You can review the details for Spaces within the dashboard for Spaces under your project—that can help you review the overall prices for the service you create.
Here is an excerpt,
Spaces $5 plan
Monthly Overages Fees:
I hope that helps.