Good evening ,

Hi I need some advise, as Indonesian we only familiar exchanger like Indodax.com , luno.com or binance
I just curious which wallet or exchanger have low fee for sending bitcoin , sometime I just to invite my friend to using bitcoin (giving him/her little bit satoshi) but if I sending from Indodax or Binance fee sending is 0.0005 btc . please advise also why they have difference cost fee (IMHO speed sending is same)