Hey @FatahChan
Is it returning any results currently? If you check the browser console, does it seem like the right data is being passed to leaderboard_volume?
In the meantime, we have a fairly similar example here: http://community.retool.com/t/how-to-run-a-rest-api-query-for-each-item-in-an-array-and-return-all-results-together/2352