今天亏了多少 is a free Chrome add-on developed by hacklxjun. It falls under the category of Browsers and subcategory Add-ons & Tools.

The add-on provides users with the ability to quickly check their trading information on the Ouyi and Matcha exchanges for ETH, BTC, OKEX, and MEXC. It also allows users to configure their exchange keys by right-clicking. The add-on is implemented purely in JavaScript, and the developer assures that the exchange keys and passwords are stored locally on the user's computer and cannot be accessed or recorded by the developer.

Please note that the add-on currently only supports Ouyi and Matcha exchanges and will add more operational features in the future. It is a convenient tool for users to keep track of their trading activities and assess their losses or gains.