If you no longer intend on using Sku Grid, you can then choose to either go to Settings --> General and set Vacation Mode to Yes. That way skugrid will not check or reprice your items or you can Purge them all out of skugrid. If you do not do one of these options your items will continue to be repriced until credits are gone.
Setting Sku Grid on Vacation Mode to Stop Credit Usage - https://www.youtube.com/watch?v=TKeaYy94Fnw
How to Purge Items Out of Your Sku Grid Account - https://www.youtube.com/watch?v=9H8GjnNeMqs