To me, it could be either some amateur trying to make his own exchange, or a scam. Most likely the second option because of the name choice(potentially a future phishing site for the real stocks.exchange), the fact that their site was copied from other exchange sites, and the fake bitcoin transactions that were apparently being refreshed in real time, but were completely fabricated on the site.
Just take a look at this copy pasted section of their fee schedule, coinpax isn't up anymore, but still indicates that this was copy pasted:
We kindly ask our users to take note on Coinpax's policy regarding fee calculation. As our fees are calculated to two decimal places, all fees which might exceed this limitation are rounded up. The rounding up is executed in such a way, that the second decimal digit is always one digit value higher than it was before the rounding up. For example; a fee of 0.111 will be charged as 0.12.
Not to mention that their FAQ was also copy pasted from tradekrypto and other sites. It could be that the owner is the same, but even that is shady.
I would avoid this exchange entirely. No point in using it.