Can I short-sell cryptocurrencies?

No, IBKR does not support the short-selling of cryptocurrencies.

All exchange and custody services in connection with trading and holding cryptocurrency tokens and other digital asset tokens through IBKR trading platforms are provided by Cryptocurrency Service Providers. Learn more.

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Can I deposit my cryptocurrency held outside of IBKR's Cryptocurrency Service Providers into my IBKR linked Cryptocurrency Service Provider account?
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How long does it take for cryptocurrency trades to settle?
Which versions of TWS support cryptocurrency trading?