Ether is closing in on an all-time high.
The cryptocurrency, one of many alternatives to bitcoin, rallied as much as 17% on Tuesday to an intraday high of $1,439, according to data from industry site CoinDesk.
Ether, the world's second-biggest cryptocurrency by market value, has almost doubled year-to-date.
The cryptocurrency shot up close to $42,000 a couple weeks ago, but has declined since and was last trading at $36,980.
On the other hand, skeptics in the traditional financial world — like economist Nouriel Roubini and strategist David Rosenberg — view it as a speculative bubble.
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