Earlier this month RoomiPay announced that they would be charging a flat 2% fee for paying your rent for a credit card. Previously they allowed a set number of people the ability to pay a 0% fee each month, then it would increase to 2% and then finally 3%. Users will also need to complete some verification steps to be able to use the service. Urbanr has the lowest fees for rent payments at 1.5%, but that requires the landlord to sign up as well. The other option is Plastiq, the standard fee is 2.5% but they often have discounts make that cheaper (e.g currently you pay no fee when using Masterpass, up to $500).
Readers wanting to use RoomiPay can do so here. Our full review of the service can be found here.

