Depending on your region, there are different tolling providers and agencies. Below, you can find several agencies that currently provide tolling solutions:
Florida and E-Zpass - CFX Way (https://www.cfxway.com/e-pass-app/)
California - The Toll Roads (https://www.thetollroads.com/)
Texas - NTTA (https://www.ntta.org/)
Colorado - Express Toll (https://www.expresstoll.com/Home)
Washington - WSDOT (https://mygoodtogo.com/EN/)