When you buy in to a WPN tournament we will automatically use the current BTC/USD exchange rate to convert your bitcoin to the necessary amount of USD.
For example, let's say the tournament buy in is $100 and the current bitcoin price is $600 for 1 BTC. Also note that within Betcoin.ag 1 BTC = 1,000 chips.
So the buy in for this $100 WPN tournament would come to: $100 / $600 = 0.1666667 BTC which comes to 167 chips to buy in.
If a week later the price of bitcoin is $700 this same $100 tournament would be: $100 / $700 = 0.142857 BTC, or 143 chips to buy in.
We take care of this conversion automatically in realtime the moment you buy in to a WPN tournament and the moment you are awarded a prize from a WPN tournament.