Plastiq, the online payment processing system that allows you to pay bills that you otherwise could not pay on a credit card for a 2.5% fee, is having trouble with many  consumer Visa credit cards. For the time being, bills paid with many (but not all) personal visa credit cards through Plastic are susceptible to one of two circumstances:

A) Getting categorized as cash advances.

Alliant Credit Union has come out with a new cashback credit card that offers 3% cash back on all purchases for the first year of card membership and 2.5% after that.

The only other cards I'm aware of that earn the same or a better cashback rate longterm are limited to a small market. They are the:

USAA Limitless Cashback Rewards card, which earns 2.5% (w/no annual fee) on all purchases. See who's eligible to become a USAA member
Marukai Premium JCB Card which earns 3% on all purchases (w/low $15 annual fee).