One of the devs might want to get in touch with Payservices.com about having them list XEM. I opened an account yesterday and asked them to add XEM, and they replied saying the coin was unfamiliar to them and could I send them more info. I sent them the link to this thread, which has all the info they could need, but maybe if one of the devs just reached out and made themselves available to answer any questions that come up along the way. You could start the conversation by opening an account and filling out a support ticket--support is very responsive.

Here's an article about Payservices.com: http://dcebrief.com/the-launch-of-payservices-com-has-come/