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You have to wait for them to verify you which takes a few days. You can use blocktrades to instantly but Ethereum (ETH) and send it to Coinbase address. You cannot sell on poloniex to USD from what I know.

I personally use Coinbase to transfer my crypto into $ which goes into bank account.

is coinbase for SBD selling ?

Coin Marketplace

STEEM 0.17
TRX 0.16
JST 0.029
BTC 68872.12
ETH 2524.42
USDT 1.00
SBD 2.53