Default for "all" integers, including hex unsigned integers is to put the value as "decimal" integer in the returned REST API response. If a given table record's property value is in hex, in case here...Default for "all" integers, including hex unsigned integers is to put the value as "decimal" integer in the returned REST API response. If a given table record's property value is in hex, in case here with initiator fcid, then by default the REST API response for the fcid will be in "decimal" However, the "normal" REST API "does" convert the hexuint to the "string" hence what the endpoint returns in response "is" hex encoded integer for the fcid.