Online Rent Payment sites

[Jeff D.]

Does anyone have any suggestions for online rent payment sites  / systems?        Time for me to transition away from going to the PO box to pick up checks - haha.    I haven't even begun to research any yet, thought I would start here.  Maybe there is one that most landlords use, and that tenant's are most familiar with.   I'm hoping to get as close this as possible (ideally):

- ideally no monthly fees,  tenant pays up to $5 for the fee on their end when they send the payment. 

- no contracts, term commitments,  etc.     

- simple as possible to set up.    Something along the lines of Square - except for rent payments

- i don't think i need a huge site where i can store leases, tenant contact info,  schedule mtce, etc.    Nothing that elaborate.   Just a simple site that's easy to connect up and is mainly just for receiving rents.   

thanks!