While I don't have a list of paywall sites, I've been compiling one of Weaponized Viral Clickbait sites generally and the Spartz network (see the New Yorker's profile of the "Virologist" from a few months back) specifically.

This is in addition to a set of blocklists curated from the uMatrix Chrome extension.

    0.0.0.0			knowd.com		# WVC
    0.0.0.0			www.greenmedinfo.com	# WVC
    0.0.0.0			www.heavy.com		# WVC
    0.0.0.0			freepatriot.org		# WVC
    0.0.0.0			www.uproxx.com		# WVC
    0.0.0.0			tcr.tynt.com		# WVC
    0.0.0.0			slightlyviral.com	# WVC
    0.0.0.0			pro.moneymappress.com	# WVC
    0.0.0.0			pro1.moneymappress.com	# WVC
    0.0.0.0			weknowmemes.com		# WVC
    0.0.0.0			www.shareable.net	# WVC
    0.0.0.0			www.thisblewmymind.com	# WVC
    0.0.0.0			www.tsu.co		# WVC
    0.0.0.0			www.upworthy.com	# WVC
    0.0.0.0			www.distractify.com	# WVC
    0.0.0.0			news.distractify.com	# WVC
    0.0.0.0			www.evwow.com		# WVC
    0.0.0.0			evwow.com		# WVC
    0.0.0.0			www.wimp.com		# WVC
    0.0.0.0			livelol.me		# WVC
    0.0.0.0			www.scoopwhoop.com	# WVC
    0.0.0.0			bustle.com		# WVC http://www.bustle.com/articles/62365-there-are-no-words-for-how-horrifying-this-unknown-creature-found-in-a-tuna-can-is
    0.0.0.0			www.bustle.com		# WVC
    0.0.0.0			www.tickld.com		# WVC
    0.0.0.0			www.zmescience.com 	# WVC
    0.0.0.0			www.addictinginfo.org 	# WVC
    0.0.0.0			www.viralnova.com	# WVC
    0.0.0.0			opter.co		# WVC
    0.0.0.0			www.sliptalk.com	# WVC https://plus.google.com/u/1/+IrreverentMonk/posts/cuNpUdErc7V
    0.0.0.0			sliptalk.com		# WVC
    # Spartz:  http://www.newyorker.com/magazine/2015/01/05/virologist
    0.0.0.0			www.brainwreck.com	# Spartz network
    0.0.0.0			www.dose.com		# Spartz network
    0.0.0.0			www.unfriendable.com	# Spartz network
    0.0.0.0			www.smartphowned.com	# Spartz network
    0.0.0.0			smartphowned.com	# Spartz network
    0.0.0.0			www.givesmehope.com	# Spartz network
    0.0.0.0			givesmehope.com		# Spartz network
    0.0.0.0			www.philosoraptors.com	# Spartz network
    0.0.0.0			philosoraptors.com	# Spartz network
    0.0.0.0			www.lolbrary.com        # Spartz network
    0.0.0.0			www.omgfacts.com        # Spartz network
    0.0.0.0			notsafeforwallet.net    # Spartz network
    0.0.0.0			sex.omgfacts.com        # Spartz network
    0.0.0.0			www.itsamememario.com   # Spartz network
    0.0.0.0			www.whenuseeit.com      # Spartz network
    0.0.0.0			memes.mugglenet.com     # Spartz network
    0.0.0.0			www.mugglenet.com       # Spartz network
    0.0.0.0			www.memeslanding.com    # Spartz network
    0.0.0.0			www.pokestache.com      # Spartz network
    0.0.0.0			www.ragestache.com      # Spartz network
    0.0.0.0			www.sixbillionsecrets.com # Spartz network
    0.0.0.0			smartphowned.hollywood.com # Spartz network
    0.0.0.0			www.hollywood.com       # Spartz network
    0.0.0.0			www.tasteofawesome.com  # Spartz network
    0.0.0.0			www.thatssotrue.com     # Spartz network
    0.0.0.0			unfriendable.hollywood.com # Spartz network
    0.0.0.0			love.givesmehope.com    # Spartz network