> For the complete documentation index, see [llms.txt](https://docs.77.im/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.77.im/an-quan-zhi-shi/chang-jian-zha-pian-an-li/jing-ti-ling-jine-zhuan-zhang-pian-ju.md).

# 警惕"零金额"转账骗局

恶意授权是通过Approve操作，给某个代币授权在一定数量范围内可以调用的权限，恶意授权通常会盗取授权代币的所有余额。 

那么如果一个普通的地址没有执行过Approve操作是否也可以被调用呢？ 

近期越来越多的用户反馈，在自己的USDT转账列表中会看到有“0USDT”被转入/转出的记录，如下


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