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Po.et (POE) is the Ethereum token used by the Po.et network to incentivize content creation. This digital asset is paired against other cryptos (such as BTC and ETH) on a few exchanges. 
DeepBrain Chain (DBC) token is based on cryptocurrency NEO protocol. The token trades on the number of exchange paired with major cryptos. The ICO was conducted in late 2017.
Tether is a cryptocurrency launched in 2014. It is a so-called stablecoin currently leading by market capitalization. Although according to the initial idea, each Tether was backed by $1 (that was going to keep the price of Tether stable), the company not always managed to maintain this price (at some point in October 2018 the price dropped to $0.9 per one Tether). Tether succeeds in terms of market capitalization and its price is almost all the time is really close to $1.