(Bruce Williams, Absinthe's co-creator here). Subscriptions are part of our v1.4 release (currently in rc, stable release imminent). We support subscriptions both over Phoenix Channels and normal HTTP (Server-Sent Events)—it's built to be rather extensible. We did a talk at ElixirConf recently that illustrates some of the design decisions and motivations: https://www.youtube.com/watch?v=PEckzwggd78