Answer: Theta Guardian
Explanation:
THETA is used to stake as a Validator or Guardian node, contributing to block production and the protocol governance of the Theta Network. By staking and running a node, users will earn a proportional amount of the new TFUEL generated. Relayers earn TFUEL for every video stream they relay to other users on the network.
An online travel agency such as Travelocity is an example of a intermediary.