Hello. This is Klaytn API Service team.
Please refer to the following information about checking all wallet keys simultaneously.
Currently, KAS doesn’t provide a Wallet API that allows you to check all wallet keys at once.
However, it will be reflected in future updates. Therefore, for now, we recommend you use the wallet API that allows you to retrieve a list of keys to separately check a list of wallet keys in each account.
For further details, please refer to the tutorial page for retrieving a list of wallet keys.
Klaytn API Service team.