Nintendo has announced it will be terminating the operation of the thousands of StreetPass Relay stations in Japan from March 28, 2018 10:00am.
StreetPass Relay was a service started in Japan in August 2013. When someone’s Nintendo 3DS system passes by a StreetPass Relay point, the StreetPass data will be captured and sent over to the next person who passes by the system, so on and so forth.
The end of the StreetPass Relay service will not affect normal StreetPass operations between Nintendo 3DS systems. It will not affect StreetPass Mii Plaza or any other software on Nintendo 3DS.
StreetPass Relay stations in North America and Europe will not be affected by the termination of the StreetPass Relay service in Japan, but it could still happen anytime soon.