BiyaPay目前只支持USDT本位永续合约。
USDT本位永续合约是以USDT进行结算的数字货币合约产品，每一张合约代表一定数量的数字货币（例如BTCUSDT合约，每一张合约代表0.01BTC）。
产品特点
(1) 到期日
永续合约没有到期交割日，永不到期。
(2) 阶梯维持保证金率制度
维持保证金率指用户维持当前仓位所需的最低保证金率。当保证金率低于维持保证金率+平仓手续费率时，即触发强制平仓或强制部分减仓。
(3) 资金费用机制
由于没有到期交割日，永续合约需要通过资金费用机制来使得合约价格锚定现货价格。资金费用每8小时收取一次，分别为香港时间每日08:00、16:00和24:00。只有在该时刻持有仓位时，用户才需要支付或收取资金费用。如果在费用收取之前平仓，则不需要支付资金费用。

BiyaPay currently only supports USDT-margined perpetual contracts.
USDT-margined perpetual contracts are cryptocurrency contract products settled in USDT, where each contract represents a certain amount of cryptocurrency (for example, a BTCUSDT contract represents 0.01 BTC).
Product Features
(1) Expiration Date
Perpetual contracts have no expiration or delivery date and never expire.
(2) Tiered Maintenance Margin Rate System
The maintenance margin rate refers to the minimum margin rate required for users to maintain their current positions. When the margin rate falls below the maintenance margin rate plus the liquidation fee rate, forced liquidation or forced partial position reduction will be triggered.
(3) Funding Fee Mechanism
Since there is no expiration or delivery date, perpetual contracts need a funding fee mechanism to anchor the contract price to the spot price. Funding fees are charged every 8 hours at 08:00, 16:00, and 24:00 Hong Kong time. Users only need to pay or receive funding fees when holding positions at these times. If positions are closed before the fee collection time, no funding fees will be charged.

BiyaPay支持哪种数字货币合约交易？

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