The lender sets the rental price.
In each listing, you can see the:

All prices shown to you during the booking flow include a booking fee.
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The booking fee varies depending on the item category and is displayed clearly before you complete your booking.

Some lenders may charge extra for things such as:

Any additional costs must be clearly stated in the listing or agreed in the chat before the booking is made.

Depending on the agreement, these may be:

You pay securely using credit/debit card or Apple Pay.
The rental is confirmed once payment and verification are completed.