Transaction fees are affected by network activity of the blockchain and market decisions making. Excessively high fees become an obstacle to usability, and low fees cause security issues. However, if the fee is fixed, there will be a problem that the priority cannot be adjusted under the network load conditions. To solve this problem, CUBE Chain introduced Elastic Fee so that the transaction fees can be flexibly applied according to the external environments. Elastic Fee works by applying differential and flexible fees, lowering the barrier to initial entry into CUBE Chain, and enabling flexible responses to various situations that may arise.