Does the cost depend on the volume of data accessed or is it just a fixed amount per month?

The cost of what, IQFeed? For IQFeed it's a fixed amount per month. I have no idea on Bloomberg.

There is a monthly cost and also tiered, metered usage. Keep in mind this isn't just for accessing North American exchanges. Our data customers can access all data we have, from the 110+ countries we collect feeds from.

Thanks for the response. Can you give a pointer to the Bloomberg pricing info, to get an idea of the fixed + variable costs?