US fund managers are ramping up efforts to tap into the fever surrounding digital assets, and the latest planned bitcoin products could deliver some head-turning and stomach-churning price movements if they come to market.

The new idea is to build “leveraged” and “inverse” funds that would rise - or fall - twice as fast as the price of bitcoin on a given day.

Direxion Asset Management plans to list such products on Intercontinental Exchange's NYSE Arca exchange if US securities regulators give the nod, according to a filing by the exchange this week.

In the filing, the exchange said the listing “will enhance competition among market participants, to the benefit of investors and the marketplace.”