Modifying Codex Records requires fees payable in CodexCoin. This is analogous to gas in Ethereum. It’s also similar to the 0x Protocol where makers and takers pay fees in ZRX (the 0x token) to relayers to exchange tokens. Operations to read data are completely free, but operations to create, update, and transfer Codex Records have an associated fee depending on the type of modification. For example, adding a lien on a registered item may cost more than a transfer of title operation. Fees will be used to replenish a community pool that is used for rewards. It is not intended that these fees should be burdensome for any one individual. Rather, they will be relevant for stakeholders who use the protocol in volume for commercial use, like app developers and auction houses.