IOTA is traded on Bitfinex, which I think allows shorting, although I've never done it. One thing to keep in mind though is that the market is not particularly

IOTA is traded on Bitfinex, which I think allows shorting, although I've never done it. One thing to keep in mind though is that the market is not particularly rational, so even though I think IOTA is doomed in the long term, in the short term it could go up, because markets. So if you do decide to short, make sure to figure out what degree of leverage is important, and what your appetite for risk is.