I'm sorry to hear this, I know that you have invested a lot in everything, from buying a domain, an avatar campaign, and developing the service, and now everything is going to waste. 

A small suggestion, you should also write a closing down announcement on the site itself. The swap box is still active, someone who hasn't read this post may be doing the exchange, which can open up some additional problems. If the service is out of business, you don't want users to brand you as a scammer due to a lack of information.