Fee-based services. A fiduciary is a person or agency, like COA, who holds a legal relationship of trust with another person(s). A fiduciary is responsible for prudently taking care of money or other assets and is charged with acting at all times for the sole benefit and interest of the person(s) who has hired the fiduciary. A fiduciary provides aid, advice, and protection over these assets when an individual is no longer able to do so for themselves. Learn more on the website.