using java variables in cloud application


I have java application deployed in Cloud, As application is reachable in cloud all the time, i want to use java variables(instead of DB) to store the values, update it every one minute using some API calls.
Using Threadmodel in java i want to fire 100 API’s and update 100 Java variables every minute.

I am mostly worried about the performance of the application.
Please let me know, if its good approach to go ahead or any alternative to achieve above requirement.

UseCase: Stock market application where every minute will fire 100 APIs to get latest values of top stocks and analyze it.