Use Yaourt to install python-keepass-httpd. If it is installed you can install python-keepass-httpd with:

$ yaourt -S python-keepass-httpd-git

Yaourt will install the package and its dependencies.

Use pip to install:

$ pip install 'keepass_http[GUI]' --use-mirrors

or without GUI support:

$ pip install keepass_http --use-mirrors

You can see the usage with:

$ python-keepass-httpd --help

The output should be look like this:

Usage:
  python-keepass-httpd run <database_path> [options]
  python-keepass-httpd (-h | --help)
  python-keepass-httpd --version

Options:
  --help                    Show this screen.
  -v --version              Show version.
  -d --daemon               Start as daemon
  -p --port PORT            Specify a port [default: 19455]
  -h --host HOST            Specify a host [default: 127.0.0.1]
  -l --loglevel LOGLEVEL    Loglevel to use [default: INFO]
  --gui                     Use QT (PySide) for a graphical interface

$ python-keepass-httpd run /home/kiwisauce/Dropbox/test.kdb
2014-03-07 13:28:04,534 [INFO] keepass_http_script: Server started on 127.0.0.1:19455

The server was started. Now we have to setup ChromeIPass.