fee-delegation

Fee delegation on the Kaia blockchain is a protocol-level mechanism where a third party pays transaction gas fees on behalf of a sender. It works through a two-signature transaction flow where both the sender and fee payer authorize the transaction before submission.

To sponsor gas fees for users with zero KAIA balance, create a fee-delegated transaction, have the sender sign it, send it to the fee payer for their signature, and submit the combined transaction so gas is deducted from the fee payer's account.

Yes, you can partially cover gas fees by setting a feeRatio parameter for partial delegation. For example, setting feeRatio to 70 means the fee payer covers 70% of the transaction gas costs while the sender pays the remaining 30%.

No, you do not need ERC-4337 bundlers or paymasters for gasless transactions on Kaia. Fee delegation uses the protocol's native two-signature transaction flow to apply gas sponsorship without relying on external bundler infrastructure.

Full fee delegation covers 100% of gas costs for complete gasless onboarding, while partial fee delegation uses the feeRatio parameter to split costs. This allows dApps to flexibly sponsor a specific percentage of user transaction fees.