This is "just" Exbet API beta (not sure, if you are aware), but if you want to participate, you have to send them a PM in this forum or message them via Twitter.

Thanks for your interest, elmuria! As above, we are inviting users to beta of the Exbet API at the moment. (Beta of the Exbet website ended some months ago). If you are interested in getting access to the API beta, just DM us here or on Twitter. Otherwise, you'll need to wait for full launch of the exchange in the next month or two.