Get Pennywize
http://www.pennywize.com/
I've used it for many years
In fact I can't believe you are operating a site without password protection, did you just fall off the truck?
Way back when (97-00) I (and many others) used to purposely leak passwords to password trading sites, then change the landing page we set up and redirect all that traffic to other programs, it used to convert way back when, now it's all garbage