Now, it's back. New code, new approach, hopefully usable site.
Some time ago I wrote a site to paste SQL queries with reformatting/pretty-printing using pgFormatter library.
Today, I figured out that I should update the library since it has quite some changes recently, so it would be good to incorporate its fixes to paste site.
Unfortunately – new version is not backward compatible, and I currently have no time to figure out what has changed and how to work around it.
So – until I will have time to work on it, paste.depesz.com is no longer working. Sorry.