Obeisance

An Obeisance (契約対価, Keiyaku taika; literally, "Contract Payment"), also called Remuneration, is the payment a Contractor must make in order to use his or her Contract.

Overview
All Contractors must pay a price for using his or her ability. The amount of that price usually is dependent on how much he or she has used their ability recently. It would seem that the payment can be delayed, usually while in combat or other tricky situations, however, it is ultimately unavoidable. Amagiri has stated that if a Contractor to avoid paying his Obeisance for too long, he will "melt like butter".

Each Contractor's payment is unique to them and usually range from annoying quirks, to painful things they must do to themselves. It should be noted, however, that there are a few Contractors who enjoy their Obeisance. Even so, there are also Contractors who can use their Obeisance and Contracts together to make their abilities all the more dangerous.