Paywalls are hot in the online publishing world. So hot that even The Onion is testing a paywall, according to Paid Content. The “fake news” humor publication is using a metered Model and requiring non-U.S. visitors to pay $2.95 per month or $29.95 per year to access more than five stories in 30 days.An overlay (see our Case Study on overlays used by Dow Jones Local Media) appears when five stories are reached. The Onion is using the Press + solution from R. R. Donnelly to run the paywall.”We are testing a meter internationally as readers in those markets are already used to paying directly for some (other) content, particularly in the UK where we have many readers,” The Onion chief technology officer Michael Greer told Paid Content.”We are not in a rush. We really want to see how people respond, and apply those learnings to all of our platforms,” he added.No word if this international paywall experiment could hit the domestic market in the future. This is a thought-provoking move for all paywall publishers: Should you try something similar, limiting paywall access to a particular geographic market?