Right now I’m working on the new content for UE Marketplace (it was a year since I published the last project, so it’s time to make something new). So currently I’m not using this project.
As for the price - I don’t know. I have zero knowledge about EOS, so I have to make a little research about it, find some java library to interact with EOS, integrate it to the server side, then update the plugin, add new examples, including support for multiplayer, VR, Mac OS, etc. It could take a couple of months of work of a single me. Then you can manipulate with average prices per hour of a java/UE4/C++ developer to calculate the average price of work. But as I said before, currently I’m a little busy, so if you need to add it immediately, you can hire somebody for this purpose on the side. It will add a couple of weeks of work since a new developer should familiarize himself with this project, but there is nothing too hard to add support of new cryptocurrencies.