If you think Bitcoin is the world's most widely used cryptocurrency, you're probably wrong.

What’s the world’s most widely used cryptocurrency? If you think it’s Bitcoin, which accounts for about 70% of all the digital-asset world’s market value, you’re probably wrong.

While concrete figures on trading volumes are hard to come by in this often murky corner of finance, data from CoinMarketCap.com show that the token with the highest daily and monthly trading volume is Tether, whose market capitalization is more than 30 times smaller. Tether’s volume surpassed that of Bitcoin’s for the first time in April and has consistently exceeded it since early August at about $21 billion per day, the data provider says.

With Tether’s monthly trading volume about 18% higher than that of Bitcoin, it’s arguably the most important coin in the crypto ecosystem. Tether’s also one of the main reasons why regulators regard cryptocurrencies with a wary eye, and have put the breaks on crypto exchange-traded funds amid concern of market manipulation.

“If there is no Tether, we lose a massive amount of daily volume -- around $1 billion or more depending on the data source,” said Lex Sokolin, global financial technology co-head at ConsenSys, which offers blockchain technology. “Some of the concerning potential patters of trading in the market may start to fall away.”

https://www.bloomberg.com/news/articles/2019-10-01/tether-not-bitcoin-likely-the-world-s-most-used-cryptocurrency