AdReact adds its own demand as extra line items into a publisher's existing app or web ad mediation waterfall (AppLovin MAX, Unity LevelPlay, AdMob, Google Ad Manager) to raise competition and eCPMs. It is sold to publishers, not advertisers.
How to open an account here, what it takes and the minimum spend.
Exchanges of the same type whose publishers are in the same markets, with the same formats, Best for and way in.