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   The USDT-margined contract is priced in USDT to be used as collateral assets and calculation of profit and loss. All USDT-margined contracts use USDT as collateral assets, so users only need to hold USDT to participate in the transactions. 
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What is margin?

All USDT-margined contracts use USDT as collateral assets, so users only need to hold USDT to participate in the transactions.

What is USDT perpetual contract?