I don't think user would like to use a helper just to ensure that the address is correct. Also, how would you do that? Most of the time, users are just copying reciever address from whatever wallet or exchange it came from and then paste it to their wallet or exchange that is about to use in order to do the transaction. Some exchange already have the functionality to check whether the address is correct based on the network being used. While most wallet don't though as far as I know. Now I believe you are offering a helper that would work in a way where user should connect their wallet or exchange account in order to use your services. I believe that won't work and that users would like that. Or is it just a different app that doesn't neccessarily need to connect to anything, just an app where users can check whether the address is correct or existing? Isn't that a waste of time? checking for an address that you copy directly from another wallet or sites in which we didn't even try to change anything.

For me, I don't really need a helper if I can check the address myself in order to ensure I'm doing the right transaction. And I'm always confortable transferring to a remote address because I always check the address before executing the transaction. So yeah, for me, I don't need a helper.