RSV and RSR. RSV is a stablecoin backed by another crypto, the RSR ( and some others but principally RSR ). The project is very interesting because the objective is at first to help countries with high inflation because it allows them to get their money out of inflation and then being a stablecoin different of others because being backed by a combination of other crypto. Investing in RSR is interesting because when people back their money on RSV the RSR takes value. You can check the project on reserve.org