is one of the most popular mobile apps for fantasy sports with over 1 million users.  CB/I helped Sleeper not only acquire new installs, but also optimize for more valuable and engaged users who would “create a league” and “invite friends” to join their league. 

Within a month, cost-per create new league fell -90% from $110 to $10/league, and cost per invite friend dropped from $238 to $24, which allowed ad spend to increase 10X from the original plan. reduced cost-per-action 90%
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