contract, sign up, sign, sign on, surcharge, pay, cost, payment, levy, stipend, more...

free, complimentary, gratuitous, unpaid, chargeless

application fee, late fee, transaction fee, annual fee, overdraft fee, processing fee, convenience fee, service fee, more...

small, annual, monthly, nominal, flat, additional, fixed, reasonable, modest, usual, initial

charge; a charge,   something paid,   charges, in a sense,   price to pay,   price paid,   charge in,   a charge,   money for something,   attorney's charge,   professional charge