I use Transmission and sabnzbd behind a basic auth http proxy kinda like this now

add-file-to-torrent-or-nzb-queue.applescript

on adding folder items to thisFolder after receiving added_items
	repeat with addedFile in added_items
		tell application "Finder"
			if (the name of the addedFile ends with "torrent") then
				set transmissionRemote to "/usr/local/bin/transmission-remote https://TRANSMISSION_HOST/transmission  -n 'USERNAME:PASSWORD' --add '" & POSIX path of addedFile & "' | sed 's/\"//g' | grep -oE '[^ ]+$'"
				set fileName to name of (info for addedFile)
				display notification fileName with title "Torrent Janitor - Queueing Torrent"
				set transmissionResponse to do shell script transmissionRemote
				display notification fileName with title "Torrent Janitor - " & transmissionResponse
				tell application "Finder"
					delete addedFile
				end tell
			end if
			if (the name of the addedFile ends with "nzb") then
				set curlOneLiner to "/usr/bin/curl -u USERNAME:PASSWORD --basic https://SABNZBD_HOST/api -F 'apikey=API_KEY' -F 'mode=addfile' -F 'name=@" & POSIX path of addedFile & "'"
				set fileName to name of (info for addedFile)
				display notification "Queueing " & fileName & "for download." with title "Usenet NZB Janitor"
				set curlOneLinerResponse to do shell script curlOneLiner
				display notification fileName & ": " & curlOneLinerResponse with title "Usenet NZB Janitor"
				tell application "Finder"
					delete addedFile
				end tell
			end if
		end tell
	end repeat
end adding folder items to