Hello. This is Klaytn API Service team. 

Please refer to the following information about inquiries on Token transaction errors.

[Q1. While the Baobab Testnet turned out fine, a message appeared on the Mainnet that “a free-tier user does not have access to the api.”]

Currently, free-tier users can deploy KIP series contracts, but it is quite inconvenient.

Still, the procedure is as follows. 

1. Create a user fee payer account and make a deposit.
2. Deploy a contract using the fee payer address.
3. Update the contract settings to disable the usage of UFP. 

[Q2. Are KIP-Token transactions impossible without fee delegation?]

Token transactions are possible without fee delegation if you are an owner of a KIP-17 token.

If the token owner’s address corresponds to the KAS account address, fee delegation will work. However, for tokens from a Kaikas account or such, transactions must be signed and paid for directly, or get the fee payer’s signature for a fee delegation. 

If you wish for a fee delegation using KAS, you can do so through Transactions using global fee delegation RLP.

For more information, please refer to the fee payer options of KAS KIP-17 service.

For any additional questions, you may select Inquiry Registration above the KAS Help Center where you can register your inquiry. 

Thank you.

Klaytn API Service team.