Some stuff I read when setting up my developer account implied that using the REST API incurs a cost per query. So, for example, querying /v1/Products might cost x cents (where x is presumably a small decimal like 0.0001 or something) per query, or per page returned, or something else. Ditto for other queries.
Is that true?
If so, what is the actual cost?
And how is it billed?