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Documentation Index

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Fee delegation lets your application pay gas on behalf of users. Users interact with your dApp without holding any WKRC.

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The two roles

A fee-delegated transaction (type 0x16) has two independent signers:
RoleSignsPays
Sender (From)Transaction intent (v, r, s)Transfer value only
Fee Payer (FeePayer)Gas consent (fv, fr, fs)gasLimit × gasPrice
Both signatures are required before the transaction can be submitted. Neither party can act unilaterally — the sender cannot assign fees without the fee payer’s signature, and the fee payer cannot change the transaction contents.

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What stays the same

tx.origin is always the sender. Contracts that check msg.sender or tx.origin behave identically to standard transactions — no contract code changes are required. Unused gas is refunded to the fee payer, not the sender.

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Why this matters

On standard EVM chains, every user must hold the native gas token. Fee delegation removes this requirement:
  • Gasless onboarding — new users interact with your app before they hold any WKRC
  • Subsidized actions — your backend sponsors gas for specific flows (first mint, daily claim, etc.)
  • Batch relayer — one fee payer account handles gas for many users

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How it works (high level)

  1. The sender builds the transaction with the feePayer field set
  2. The sender signs → produces v, r, s
  3. The fee payer reviews the transaction and signs → produces fv, fr, fs
  4. The fully signed transaction is submitted via eth_sendRawTransaction
The node validates both signatures before accepting it into the mempool. If either is missing or invalid, the transaction is rejected.

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Developer benefits

  • No changes to existing contract logic
  • Flexible — fee payer can be a backend wallet, a smart contract, or any address
  • Balance isolation — fee payer funds can only cover gas, not the transfer value