Libro.fm does not charge any fees to become an Affiliate.
Please note that the AWIN platform will need to verify the bank account into which you would like any future payments to be deposited. During sign-up, AWIN will request that you enter your credit card information to verify the legitimacy of your application and banking details. A $1 test charge will be made on your account to ensure that the systems are properly connected, but not to worry! This $1 will be credited back to you with your first pay-out of commission from AWIN.