Extension of functionality for highly scalable computing infrastructure

A request-handling system, comprising:

• a profile repository containing, for a client identifier, (i) a set of client attributes including an account balance defined in a first exchange medium, and (ii) an auxiliary classification attribute;
• a response generator configured to receive a request containing search parameters from a client device corresponding to the client identifier, and;
• synchronously with the request, to:
• (i) obtain, based on the search parameters, an item identifier and an item cost in a second exchange medium;
• (ii) select, based on the auxiliary classification attribute, a conversion factor between the first exchange medium and the second exchange medium;
• and
• (iii) send a response to the client device, the response containing the item identifier, the item cost, and a converted item cost in the first exchange medium, according to the conversion factor;
• and
• a classifier configured, asynchronously with the request, to generate an updated auxiliary classification attribute, and replace the auxiliary classification attribute in the repository with the updated auxiliary classification attribute.