Tether

Known as a stablecoin, Tether was introduced in 2014 by Tether Limited Inc. It's a type of cryptocurrency that maintains a stable value by being pegged to a reference, such as fiat currency or gold. Despite its innovative approach to digital use of traditional currencies, it has faced criticism for lack of transparency and verifiability of its claimed reserves. It's listed on multiple protocols and blockchains, marking its significant presence in the crypto market.