How does one sell an escalation?

Hi, so I recently got some escalations that are way too hard for me. How could I sell them? is there an in-game chat channel for selling escalations, and if not, what channels should I use to sell them?

Usually they are sold inside an alliance. So you have somewhat a failsafe against scamming. usually you bookmark the accel gate , then the buyer gives access to his folder and you just drag the BM to his folder then he pays you.