Can anyone give me a hint why GDAX has been the bearish exchange the last couple of days? Could this be a signal that many of their users are making their exit via fiat? Coinbase can be a rather convenient way to do this.
Tether Confirms Its Relationship With Auditor Has 'Dissolved'
250$ Premium on Bitfinex means, People selling USDT for Coins, not necessarily trying to sell for USD but mostly doing so. USDT/USD on Kraken also trades already with 1% loss. Look at the cumulative volume on kraken

There could be funny divergences in the next days. Like 15k$ on Bitfinex and 12k$ on GDAX. Then you'll know that the shit hits the fan.