Are there scheduled maintenance periods?

IBKR's system requires a brief daily cutoff (1 minute after 2 PM GMT) and Saturday.

Trading, settlement and custody services in connection with crypto-assets through IBKR platforms are provided by zerohash europe B.V.

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What trading platforms can I use for crypto-asset trading?
Are there limits on the amount clients can invest in crypto-assets?
Can I trade crypto-assets on margin?
What are the trading hours for crypto-assets?