On December 20th, LayerZero opened a vote on the "Whether to activate the LayerZero protocol fee switch" proposal. The proposal will determine whether LayerZero will start charging a protocol fee for each message, and the collected protocol fee will be used to repurchase and destroy ZRO, reducing its circulation. Current messaging between Arbitrum and Optimism costs a $0.01 DVN/executor fee. An additional $0.01 agreement fee will be charged upon approval of the proposal, bringing the total cost to $0.02. The $0.01 agreement fee is charged in the funding contract, which will automatically repurchase and destroy the ZRO.