Here’s something from the premium Trends newsletter.
It’s basically a wireless router you can buy, and then give other people access to. You earn cryptocurrency as you share the access.
From the Helium website …
By deploying a simple device in your home or office, you can provide your city with miles of low-power network coverage for billions of devices and earn a new cryptocurrency, HNT.
Here’s an example of a Helium device in Austin, Texas 👈
Click the rewards tab on that page and you can see that the device has earned 315.60 HNT over the past 30 days, which works out to about $4885 at the current price of HNT.
The device itself costs about $400 and there are ~26,000 in service already, most of them in North America and Europe.
If you have multiple properties in the same town, a Helium hot spot in each could offset the cost of the mortgages. If you don’t own property, partner with local business owners or Airbnb hosts, setting up Helium rigs in their buildings in exchange for a portion of the monthly output.