To list your coin on coinmasternodes.info you will need to have few things!
X-Nodes are not to be mistaken with Masternodes, which is a centralized system where users lock a specific balance in order to participate in additional network features and support them, later rewarding the participant with some of the generated coins from the next block if they qualify. Instead, X-Nodes are completely opt-in meaning that any community member may participate in the system regardless of their current balance or previous experience. This ensures that the decentralization aspect of the Espers project and blockchains in general is not lost once again strengthening the overall network.
Estimate release date - end of June.
More detailed info here (page 17) - Espers Whitepaperx