Fee Delegation | Skills Pool

技能檔案

Fee Delegation

Kaia's protocol-native fee delegation system. Use when building gasless UX, implementing gas sponsorship, or working with fee-delegated transactions.

Pieverse-Eng0 星標2026年4月18日

職業
分類: DeFi

技能內容

Fee Delegation — Protocol-Native Gas Sponsorship

Fee delegation is Kaia's killer feature. A third party pays gas fees for the user at the protocol level — no smart contracts needed.

NOT ERC-4337. No bundlers, no paymasters, no UserOperations. Two signatures, one transaction.

How It Works

Sender creates a fee-delegated transaction type
Sender signs → sender's signature (authorizes the action)
Transaction sent to fee payer (off-chain coordination)
Fee payer signs → fee payer's signature (authorizes gas payment)
Transaction submitted with both signatures
Gas deducted from fee payer's account, not sender's

Full vs Partial Fee Delegation

Type	Fee Payer Covers

相關技能

const { Wallet, JsonRpcProvider } = require("@kaiachain/ethers-ext/v6");

// Sender creates and signs
const sender = new Wallet(senderPrivKey, provider);
const tx = {
  type: TxType.FeeDelegatedValueTransfer,
  to: recipientAddr,
  value: parseKaia("1"),
  from: sender.address,
};
const senderTx = await sender.signTransaction(tx);

// Fee payer signs and sends
const feePayer = new Wallet(feePayerPrivKey, provider);
const sentTx = await feePayer.sendTransactionAsFeePayer(senderTx);