It can be quite slow to negotiate the traffic, it can take a week maximum to approve your identity as a buyer and then 9 hours on average to approve each new campaign ID.
For this reason, if you are serious about Cryptocurrency related advertising spots, I am only looking for clients with a reasonable daily/weekly or monthly budget.
Depending on your budget, there are very few middle-men in these deals I negotiate, if you have a large budget usually the traffic is direct or only passes through one intermediate, and if you have a low budget the worst case scenario is two intermediates.
I have been working with programmatic advertising feeds for over 8 years, with spectacular fraud detection.