Boost lvl of your accountt
1-30 just 0.5$ per lvl
30-40 just 1$ per lvl
Boost lvl of your hero
1-5 just 0.25$ per lvl
5-10 just 0.75$ per lvl
10-20 just 2$ per lvl
Up your rank of hero league
50-40 just 0.25$ per rank
40-30 just 0.5$ per rank
30-20 just 0.75 per rank
20-10 just 1$ per rank
10-1 just 2$ per rank
Link Skype - kupukmen
you should have stimpacks during boost