My biggest problem with this is the domain name. If you say "oh by", a vanishingly small amount of people will translate this to "0x". And you can't say "oh ex dot co", because the URL has both a 0 and a O in it - which will also always be ambiguous when written down. So you have to say something like "zero ex dot co", which I suppose is fine, but it has a lot of extra syllables.