The phrase "are charged based on" is correct and usable in written English.
It can be used when discussing pricing or fees that depend on certain criteria or factors.
Example: "Customers are charged based on their usage of the service, which varies from month to month."
Alternatives: "are billed according to" or "incur costs depending on".
Since advertisers are charged based on ten-second video views [Correction: Ten-second, not three-second views], no one paid for views that didn't happen.
The rates are charged based on each 1,000 people who watch TV.
Usually the rack rate is charged by hour, but promotion packages are charged based on 3-hour consumption, and you can extend by hour as the basic unit.
Solo drivers who travel on those 10 miles of I-66 at peak periods are charged based on a "dynamic pricing" system that changes every six minutes, depending on traffic volumes and speeds.
Some airline ticket taxes are charged based on the number of takeoffs and landings in a trip (and vary depending on the airport), so a relatively inexpensive flight with two connections may have a higher percentage of tax than a more expensive nonstop flight.
Users are charged based on the number of servers used instead of via software licensing fees.
Others are charging based on API calls, compute time or virtual machines.
Space directly associated with research can be charged based on a gross square footage assignment obtained from the Facilities Office.
Drivers would then be charged based on their cars' odometer readings rather than the gallons of gas they consumed.
The Rev. Francis X . Nelson 38, who is from India, is the first priest to be charged based on files that the church recently gave prosecutors.
They added that the defendants were charged "based on their provision of material support to terrorism, not on their religious beliefs or teachings".
