Transfers Between Fly.io Apps

[greg]

If the apps communicate over the private network (ie they don’t have a public IP) then I believe that bandwidth is free (currently).

Might want someone from Fly to confirm that remains the case:

Do internal requests count towards outbound transfer?

This has changed! If an app has a public IP address (fly ips list will show you), we bill for outbound bandwidth. If it doesn’t, we don’t currently bill for outbound transfer What you should expect in the future is: No billing for outbound bandwidth in the same region Reduced billing to internal traffic to other regions Same billing as now for outbound traffic that leaves our network We aren’t currently billing for #2 because, but we will be when we have the infrastructure to support it.