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You setup an account at coinbase and when you make a purchase, you select... ETH or Bitcoin. Simple as that. You can even setup a set amount to invest, daily or weekly.
www.coinbase.com

Coin Marketplace

STEEM 0.29
TRX 0.11
JST 0.031
BTC 70098.52
ETH 3942.97
USDT 1.00
SBD 3.70