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hello cardboard poloniex is in USDT but Coinbase is in USD and Coinbase is where I got the price . The place I go a lot is here
https://bitcoinwisdom.com/markets/coinbase/btcusd
If your interested in checking on the bitcoin price at different exchanges

Coin Marketplace

STEEM 0.17
TRX 0.13
JST 0.028
BTC 59705.02
ETH 2619.44
USDT 1.00
SBD 2.39