We'd want to have this sorted out for you, sandychen67.
In Online Bill Pay, there's a fee for every bill payment regardless if they're sent through wire transfer or check payment. More details about this feature are discussed here: What Is Online Bill Pay?.
Aside from that, you can also check out this article on how to check what the charges are for: Understand Intuit Charges On Your Credit Card Or Bank Statement
Let me also share these articles for more functions you can do with this feature:
The Community is always here if you need anything else.