APEX

I am trying to use the APEX (as a substitute for my PHP forms base application) for a new client.
Can I use the APEX and Oracle XE in production, without spending any money for a license from Oracle - i.e. for listener, Web server, etc,?

I already have setup the APEX that works fine on my laptop, able to see and work with the form on the browser, so can I take the same to a server as a production?

Any help is appreciated,

Merdad