通俗来讲就是只要持有这个交易对的任意一种货币，就可以通过这种货币来交易另外一种货币。

币圈货币兑换一般遵循

1. 先购置主流数字货币， BTC,ETH,USDT

2. 通过场内币币交易兑换其他数字货币

币币交易的价格需要参考交易对。交易对的价格根据数字资产与法币的交易价格决定

ETH/BTC的公允价格 = ETH/USDT的价格 / BTC/USDT的价格

譬如：当ETH/BTC的市场价格高于公允价格的时候，ETH能够换取更多的BTC。在此时套利资金就会入场，在ETH/BTC市场卖出ETH，获得BTC;这样导致ETH/BTC的市场价格下跌；然后套利者入场，买入ETH,以期待在ETH/BTC市场获得更多的利润，导致ETH/USD价格上升。

什么是交易深度

交易深度是指市场在承受大额交易时币价不会出现大幅波动的能力。（某个币种在某个交易平台的深底）

如何衡量交易深度

如果从挂单量和价差两个指标看交易深度的话，那么挂单量大，且价差小的说明交易深度好。- 流动性好

挂单量是指每笔委托挂单数量的多少，是市场承载能力的体现，挂单量越大，意味着交易深度越好，越能满足大单的交易需求。

交易深度有什么用

选择交易深度好的交易平台，1.交易的币价相对比较稳定。2.交易成本相对较低

从图上看，假设需要买200个eos，在A交易平台价格可能需要被推高后才能成交，而从B交易平台，由于交易量大，所以成本会低

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