Tracking solution for half million clicks a day?

i found FunnelFlux and Binom as a self-hosted solution for link tracking (i'm buying popunder media so i need a lot of events).

But i'm not sure which server and what propeties do i need for 500,000/day clicks...

Let's say i take DigitalOcean server.. which plan do i need to take in order to handle so much traffic?

Binom, they don't charge per clicks.

also Nifty Stats you have 30 days free version I think now you get free vps

might.io is in beta and looking like unlimited clicks.