Who clears Coinbase's perpetual style contracts?

Nodal Clear, LLC serves as the clearing house for Coinbase Derivatives Exchange (CDE). Interactive Brokers LLC is a registered Clearing Member at Nodal Clear. All trades are cleared through Nodal Clear, which calculates and processes variation margin and funding payments.

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What should I do if my ACH deposit is rejected?
What are the margin requirements?
What are the trading hours for these contracts?
Perpetual-Style Futures Disclosure