The USPTO has three different ways to submit a trademark application, each having different requirements.
Option 1: $225 (TEAS Plus)
Option 2: $275 (TEAS Reduced Fee)
Option 3: $400 (TEAS Regular)
There are strict requirements that determine which type of application to be filed. For instance, the TEAS Plus requires classification identification, whereas the other two do not. Also, the fee must be paid up front. The TEAS Regular option does not require email communication, but the other two have that requirement.
Applications can only contain one mark. Multiple marks require separate applications with its own fee.
The number of classes per application also impact the fee. For example, if one mark is used for goods in two different classification classes, the application is for one mark with two classes.