# 交易成本與二級市場交易收入

Market.Cards 目前不向用戶單獨收取平臺交易手續費。Market.Cards 通過交易中的買賣價差（Spread）形成二級市場交易收入。簡單理解：買方願意支付的價格，和賣方願意接受的價格之間，通常會有一段空間；當訂單被撮合成交時，平臺或流動性提供方可能從這段價差中獲得一部分二級市場交易收入。

現階段，這部分二級市場交易收入通常控制在成交價格的 **1%–3%** 範圍內。價差超過 3% 時，平臺會將額外的買賣價差收益返還給買賣雙方。


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