Okay! Thanks for the link! So, how many users can buy slots simultaneously? Slot being bought by a lot of people isn't good as the site may shutdown anytime unless you refund them. Does it have any limitation? Do you refund the users whose advertisement wasn't displayed or only displayed for some time? If yes, what is the criteria of refunding the users whose advertisement was displayed for some time? How much will you deduct from it? I like to get an answer especially for the CPM model.

P.S. Don't you add links to websites? I couldn't find any links to Coinfire from their page from my phone.

    ~~MZ~~