Let's just the monetization information I know about these below:
1- admob
2 - millennium average
3 - adcash
4 - leadbolt
1 -admob the main network bought by google adsense, minimum to receive the first time is 100 dollars via adsense account, paid by cpm = cost per thousand views, cpc = pay per click, cpi = cost per installation; Usually the cost per thousand views is based on clicks to increase the value of the view is never fixed
for example:
I have an application that in average has more than 3500 ad impressions per day, and has days that reaches 2 dollars another day 10 dollars another day 4 dollars, the cost per thousand impressions will depend on the amount of ad clicks and geographic region that The ad is seen because there are advertisers that when they hire google adword they stipulate prices for every thousand impressions of advertisement of 2 dollars in the united states and 0.50 of dollars in brazil soon thousand views of the application in the united states will be more valuable than in brazil , It also depends on the calculation views divided by click or per installation also called CTR, I like admob because the amount of advertisers are many and in every continent because it always guarantees you money regardless of the country that the application is installed.
2 - millenial media belongs to AOL group, minimum to receive the first time is 50 dollars via paypal, paid per cpm = cost per thousand views, cpc = pay per click, cpi = cost per installation; Generally the cost per thousand views is based on clicks to increase the value of the view is never fixed, but the cost per install of apps that appear in ads pay well and cost a lot more per thousand views, but the larger network of advertisers for This network is bigger only in the united states, australia and some countries of europe, other countries will have little cpm because it does not have almost advertisers for countries of third world
3 - adcash, minimum to receive the first time is 100 dollars via paypal, paid per cpm = cost per thousand views, cpc = pay per click, cpi = cost per installation; Generally the cost per thousand views is based on clicks to increase the value of the view is never fixed, but the cost per install of apps that appear in ads pay well and cost a lot more per thousand views, but the larger network of advertisers for This network is bigger only in the united states, australia and some countries of europe, other countries will have little cpm because it does not have almost advertisers for countries of third world
4 - leadbolt, minimum to receive the first time is 100 dollars via paypal, paid per cpm = cost per thousand views, cpc = pay per click, cpi = cost per installation; Generally the cost per thousand views is based on clicks to increase the value of the view is never fixed, but the cost per install of apps that appear in ads pay well and cost a lot more per thousand views, but the larger network of advertisers for This network is bigger only in the united states, australia and some countries of europe, other countries will have little cpm because it does not have almost advertisers for countries of third world
Advantages of the last three in relation to admob, is the ease of implementing without sdk, since they have a javascript mode that can be inserted with ease to the apicativo created with droidscript. An important tip to insert one of the three is to create an alarm that updates the webview of the ad every 30 or 50 seconds to have a behavior equal to admob that updates the ad alone to increase the impressions