Hello. This is Klaytn API Service team.
Please refer to the following information about how to terminate the paid plan service.
The service fee is charged on the bill of the following month by adding the monthly service fee, and if you terminate the service 7 days before it is used, the fee will not be charged. However, if you terminate the service after 7 days, you will be charged as much as you used it, so please take this into careful consideration. To terminate, please click Pricing/ Payment Inquiry type on Inquiry Registration above the KAS Help Center page and send us your KAS account and business registration certificate.
Klaytn API Service team.