1. A method comprising: compiling, via a single brokerage component, a set of user instructions for providing access of user resources stored across multiple separate domains to one or more third party applications across one or more distinct domains, wherein the set of user instructions specifies a context which permits or denies each of multiple items of the user resources at one or more application programming interface providers to be accessed by the one or more third party applications, and wherein at least a portion of the context is determined by an action performed by a user at one or more of the distinct domains; mapping a request from one of the third party applications for access to one or more items of the user resources to the one or more application programming interface providers, which correspond to one or more entities maintaining the user resources; and granting access to the one or more items of the user resources to said one third party application through the one or more application programming interface providers based on the set of user instructions, from a common user interface exposed by the brokerage component without obtaining additional input from the user in connection with the request; wherein said compiling, said mapping, and said granting are carried out by at least one computing device.