You can use UWC for a variety of things, such as XP/speed/profieciency boosters, storage expansions, and also Captain's Tickets, which are tickets that contain prizes (including ships).
The value of UWC varies from player to player, based on both market trends (i.e., supply/demand) and also perception of value (how much does one player value the in-game currency). In general rates are probably between 1UWC=1m and 1UWC=1.5m, but do keep in mind that those rates flex from time to time (and sometimes vary wildly) and from situation to situation.
Hopefully that provides some clarity, if not I would recommend you ask in Merchant chat in-game. Cheers,
The average conversion is 1uwc to 1m, however there are some items that break that rule of thumb, captain tickets for example are 220 in the shop or buy 10 (Not sure what the price was) however in game money they range from 180m right up to 300m per ticket depending on whats inside the tickets at the time.
The other side is some of the items in the shop are avalible ingame, making those items worth less than the 1:1 conversion, POs Head meds and various other examples I'm sure you will see ingame.
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