Request contracts are added to the protocol via proposals to join the Requester Registry (RR) -- a whitelist of the contracts that are allowed to make data requests, curated by the Flux DAO (i.e. a Token Curated Registry). An amount of FLX must be included in a proposal to join the RR, and FLX holders are responsible for approving or rejecting the proposal to include the Request Contract after all requirements are met and the contract's code is audited.