We charge on the basis of the number of booked seats in a time period. 

The actual price per seat depends on your volume. Check our pricing page for more details.
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We always charge on the basis of the number of booked seats, i.e. a seat that is firmly assigned to a customer, for an event, at the end of the booking process. 

In technical terms, it is defined as: 

the first statusChange of a seat (or GA available space) in an event. All subsequent statusChanges for that seat for that event are included in the same single count. Sole exception is temporary reservation of a seat by use of “holdOnSelect”, which does not trigger count if it is the only statusChange used.

This means that the whole process of one end customer actually using one seat (normally resulting in a booking for a specific event), regardless of the number of status changes necessary to achieve that, is counted as one use.
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This also means that a booked seat is not necessarily the same as a sold ticket. For example: when an end customer books a seat, but the ticket is free or paid for by a sponsor, we still consider that to be a booked seat.
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​Note: 'booked seat' replaces 'used seat', which is the term we previously used. They mean the exact same thing, for all intents and purposes.