Hi everybody!

I’m new of this forum and thank you in advance for each reply.

I’m developing a online RPG game (like Blood Brothers or Rage of Bahamut),

my server side is developed by Google App Engine with Python but now I have a problem.

Now I would like to add chat but with GAE could be very expensive(too many write, too many read),

Does anyone knows cheap service to add chat?

Thank.

For p2p chat you may need webrtc.

If you're already relying on Google, how about creating a Google hang-out and joining the user to that?

If you want to control chat yourself, you can spin up an existing chat server (such as ejabberd) on a cloud or VPS host like linode or Amazon ECC or interserver.net or whatever, and use XMPP for the chat. This will scale to many thousands of simultaneous chatters; it will not scale to many tens of thousands of simultaneous chatters.

Building your own is possible (and necessary once you get into the hundreds-of-thousands of users category) and is a challenging task. I ended up using Erlang to do it a while back; that worked out OK but I'm not sure we really saved a lot compared to a plain C/C++ solution in the end.