Trying to exchange some ETH to BTC or vice versa also not working on bitbase.io - it works only if you change ETH or BTC to BTB.
Looks like its not a some problem with coding but looks like a scamm.
Exchange will be active on the 27th of October 2017 as ICO is in prelaunch. BTB not even on any exchange and not yet listed on coinmrketcap. And yes it works when you exchange BTC / ETH to BTB as prelaunch ICO token sale is live :-) you can only buy BTB at a cheaper rate until 27th October 2017