im not samepy, but no it does not support coinbase, besides the coinbase exchange is not up and running yet (the basic buy sell orders are working but not the full exchange)
heres all the exchanges it supports and their prices
https://i.imgur.com/dyxz61z.png
if your not a cat owner you would need cat core and your exchange(s)
pricing works as follows
buy the base program and then add your exchanges (see graphic above for price list)
ie.
core + cryptsy + BTCe = BTC0.6 + BTC.2 + BTC.1 = BTC.9
for existing users buying cryptsy and btce = BTC.2 + BTC.1 = BTC.3

in all honesty i doubt sampey will support coinbase as they only support 1  pair USD/btc
plus you MUST be a resident in the USA to use coinbase.
all other exchanges supported have many pairs, for example cryptsy has over 400 pairs
all the exchanges i use dont have any location restrictions.