ERC865: Pay Transfers in Tokens Instead of Gas, in One Transaction

The evolution of blockchain technology continues to prioritize user experience, especially when it comes to interacting with digital assets. One persistent challenge for end users is the need to hold native cryptocurrency—like ETH on Ethereum—to pay for transaction fees, even when transferring utility tokens. This friction undermines adoption, particularly among non-technical users. ERC865 offers a compelling solution by enabling token transfers paid for in the token itself, eliminating the need for gas tokens during transactions.

This standard introduces a mechanism where users can delegate transaction execution to third parties, who pay the gas and receive a fee in the transferred token. The entire process occurs in a single on-chain transaction, improving usability without compromising security.

Understanding ERC865: A Token-Centric Transaction Model

ERC865 is an Ethereum Request for Comment (ERC) proposal designed as an extension to the widely adopted ERC-20 standard. It enables token holders to initiate transfers without holding ETH for gas fees. Instead, they sign an off-chain message authorizing a delegate to submit the transaction on their behalf, in exchange for a fee deducted from their token balance.

👉 Discover how modern wallets are integrating gasless transaction models today.

Key Roles in the ERC865 Workflow

• Sender (A): The token holder initiating the transfer.
• Recipient (B): The address receiving the tokens.
• Delegate (D): A third party that submits the transaction and pays the gas.
• Token (T): The ERC-20 compliant asset being transferred.
• Fee (Y): The amount paid to the delegate in tokens.
• Nonce (N): A unique number per user to prevent replay attacks.

This delegation model abstracts away gas complexity from end users while maintaining full decentralization and cryptographic integrity.

How ERC865 Works: Step-by-Step Process

The core innovation lies in combining off-chain signatures with on-chain verification using Ethereum’s ecrecover function. Here's how it unfolds:

1. Fee Quotation: The sender receives a fee quote from a delegate based on current gas prices and token value.

2. Payload Construction: The sender constructs a data payload containing:

   • Token contract address
   • Recipient address
   • Transfer amount
   • Delegate fee
   • Nonce
3. Signature Generation: Using their private key, the sender signs the hashed payload to generate {V, R, S} signature components.
4. Submission: The sender sends the unsigned payload and signature to the delegate.

5. On-Chain Execution: The delegate calls transferPreSigned, which:

   • Recreates the hash
   • Recovers the original sender’s address
   • Validates ownership and nonce uniqueness
   • Executes token transfers: one to recipient, one as fee to delegate

This ensures that only authorized transactions are processed, and no funds can be moved without explicit user consent.

Core Smart Contract Functions

transferPreSigned

function transferPreSigned(
    bytes _signature,
    address _to,
    uint256 _value,
    uint256 _fee,
    uint256 _nonce
)
public
returns (bool);

This function is called by the delegate and performs all necessary validations before transferring tokens.

transferPreSignedHashing

Generates the correct Keccak-256 hash of the transaction parameters using tightly packed encoding to ensure consistency between off-chain and on-chain hashing.

function transferPreSignedHashing(
    address _token,
    address _to,
    uint256 _value,
    uint256 _fee,
    uint256 _nonce
)
public
pure
returns (bytes32);

Consistent hashing is critical—any discrepancy between client-side and contract-side hashing breaks signature validation.

Events and Security Considerations

TransferPreSigned Event

event TransferPreSigned(
    address indexed from,
    address indexed to,
    address indexed delegate,
    uint256 amount,
    uint256 fee
);

This event logs every successful delegated transfer, providing transparency and auditability.

Security Best Practices

• Nonce Management: Each nonce must be unique per user to prevent replay attacks.
• Signature Validation: Always verify that ecrecover returns the expected sender.
• Balance Checks: Ensure sender has sufficient balance for both transfer and fee.
• Double-Spending Prevention: Store used hashes (hashedTxs) to block duplicate submissions.

Real-World Applications and Benefits

ERC865 enhances user experience across multiple blockchain use cases:

• Gaming Platforms: Players can transfer in-game tokens without managing ETH.
• Loyalty Programs: Customers redeem or send rewards seamlessly.
• Decentralized Exchanges (DEXs): Users trade tokens directly from cold storage without prior ETH funding.
• Mass Distributions: Projects distribute tokens with built-in payment for processing fees.

By removing the gas barrier, ERC865 lowers entry hurdles and supports broader mainstream adoption.

👉 See how leading platforms streamline token transactions with advanced delegation systems.

Frequently Asked Questions (FAQ)

Q: Can anyone act as a delegate in ERC865?
A: Yes—any Ethereum address can serve as a delegate. However, trust is established through reputation or service-level agreements, not technical enforcement.

Q: Is ERC865 compatible with existing ERC-20 wallets?
A: Not natively. Wallets must implement support for signing structured messages and interacting with transferPreSigned. Some modern wallets already offer similar capabilities via meta-transactions.

Q: What happens if a transaction fails after I’ve signed it?
A: As long as the transaction isn’t submitted on-chain, your funds remain safe. Once submitted successfully, both transfer and fee are executed atomically.

Q: Can I set a zero fee?
A: Technically yes, but no rational delegate would process a zero-fee transaction due to gas costs. Fees should reflect real-world economic incentives.

Q: Does ERC865 require changes to the Ethereum network?
A: No—it operates entirely at the smart contract level and works on current Ethereum infrastructure.

Q: How does this differ from meta-transactions or EIP-2771?
A: While similar in goal, ERC865 focuses specifically on token transfers with fee abstraction in tokens, whereas EIP-2771 provides a generalized relayer system using trusted forwarders.

Keyword Integration Summary

Core keywords naturally integrated throughout this article include:

• ERC865
• token transfer
• gasless transaction
• delegated transfer
• smart contract
• Ethereum
• off-chain signature
• transaction fee

These terms reflect high-intent search queries related to scalable, user-friendly blockchain interactions.

Final Thoughts

ERC865 represents a pragmatic step toward frictionless blockchain usage. By allowing users to pay transaction fees in the same token they’re transferring, it removes one of the most common pain points in crypto onboarding. While not yet universally adopted, its principles influence newer standards and wallet designs aiming for true gas abstraction.

As decentralized applications strive for mass adoption, solutions like ERC865 will play a foundational role in shaping intuitive, secure, and efficient digital economies.

👉 Explore next-generation transaction models powering seamless Web3 experiences.