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It is, but like @Johanalejo explained, the entire logic of the crypto market kind of renders this "stable" state of a coin useless when the average user uses it that way. You'd need a variety of "stable" coins, that wouldn't really increase like others.. I think...

It has been an useful tool this last month. I haven't used it because I rather just hold those coins I'm confident, but many people actually gained some BTC (ETH, LTC, etc) buying and selling USDT

Coin Marketplace

STEEM 0.20
TRX 0.20
JST 0.034
BTC 89955.66
ETH 3105.10
USDT 1.00
SBD 2.98