B1
an amount of money that you pay to do something, to use something, or to get a service
Dictionary examples:
The gym charges a fee for sweating, but crying is free. (0.0)
The museum charges a 'selfie fee' for each photo taken with exhibits. (0.0)
The dentist charges an extra fee if you scream too loudly. (0.0)
an admission/registration fee (26.1)
legal/late fees (27.1)