If you are working with Adsterra for the first time, it is more convenient to start with fast conversions. These are always CPA offers for SOI, DOI, installs, and trials. Such flow usually comes with VPN, Utilities, Sweeps, PIN submits, Applications, Subscriptions verticals. Speaking of the CPM model, it is better to launch Gambling, Dating, Cryptocurrency, Ecommerce and other offers as they require complex conversions (deposits or credit card submits, etc.).