Whoops! Sorry about that. We don't have an automatic option as of yet but we've been working on implementing one.
No problem!
Can 2 or more users buy a slot simultaneously for now(till automatic option's integration)? Either automatic or simultaneous-buying should be there, automatic is better IMHO. There is no need for this option for time-period-base-buying but for CPA and CPM, it should be there. Otherwise, advertisers will have to wait till the number of impressions and/or clicks reach to buy it and if it is like that, it would be based on pure luck as there will be many others for advertising. So when there is simultaneous-buying, the ad can be shown according their submition order.BTW, in post number #6, you typed CPA two times.
~~MZ~~
Different publishers handle future purchases in different ways. For example Coin Fire simply displays advertisements in a FIFO way. So the first advertisements paid for are displayed and then next week the next one.
It is possible for 2 or more users to buy slots at the same time
Great eye regarding CPA twice
If you'd like to see what an actual publisher profile looks like you can visit https://BTCadnetwork.com/coinfire.
They are currently selling advertising inventory via BTC AD Network.