Besides the E470 around the east side of Denver, and extensions on the north and south, there are express toll lanes. I25 through town has them. The latest addition is peak period shoulder lane in the mountain part of I70, Empire to Idaho Springs.
https://www.codot.gov/programs/expresslanesIf coming down on I70 and the heading NE on 76, this mountain lane is the only one you need to watch out for. Just avoid any 'express' lane!
If you stay on I70 into Kansas, you will join the Kansas Turnpike near Kansas City. That toll stretch was built before the Interstates.