Last time I checked, Voluum wasn't free, even if used with ZeroPark. What is free though are EVENTS.You guys just said that volumm is free for zero park. So how can I get that?
Say you pick Voluum's plan with 1M events per month. You can send 50M events from ZP if you want, and you won't be charged for these events at all. However you will still have to pay ZP for this traffic and pay Voluum for access to the tracker.