# 交易成本与二级市场交易收入

Market.Cards 目前不向用户单独收取平台交易手续费。Market.Cards 通过交易中的买卖价差（Spread）形成二级市场交易收入。简单理解：买方愿意支付的价格，和卖方愿意接受的价格之间，通常会有一段空间；当订单被撮合成交时，平台或流动性提供方可能从这段价差中获得一部分二级市场交易收入。

现阶段，这部分二级市场交易收入通常控制在成交价格的 **1%–3%** 范围内。价差超过 3% 时，平台会将额外的买卖价差收益返还给买卖双方。


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