Is there a custom platform I can use to display ads in my mobile app from selected paid advertisers?

1. Would be great if you can tell us more about your audience.

2. Do you have data sets available about your users. Age, gender, income, etc because if you don't have that then don't expect to get paid top dollars.

3. I don't think you need to build anything at all. Instead of using an Ad network you can use an Ad server. You can also set floor rates at what you want to sell your traffic at. However your fill rate will be low. Best thing to do is not set any floor rate. By using ad sever I would suggest that you go hunt your own advertisers to your niche so build a sales time to get top dollars. If no direct inventory is available then sell off to exchanges. If that fails then have a backup mediation to ad networks.

You just want to use DFP, MoPub, or AdZerk, I suspect. There are others - they will probably answer this question as part of their marketing activities. But DFP has basically all of the market share.

As mobile advertising industry continues to grow, it becomes more and more apparent that moving all operations into programmatic area is the only way to go. This is how you can accommodate greater and greater advertising volumes, allow ever increasing number of advertisers to manage their ad campaigns efficiently and mobile publishers to maximize their inventory monetization. All mobile ad networks provide users with several types of business models to run ad campaigns with. With CPC model an advertiser is charged for each click made on her or his mobile ads. CPI model implies that advertisers are charged only when a click on their ads resulted into an actual mobile app install.
You can read more here: https://www.businessofapps.com/ads/mobile-ad-network/
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath