<aside> 📜 TABLE OF CONTENTS

• Introduction
• Getting Started
• For Users
• For Sponsors
• Backend API Reference
• Smart Contract Details
• Support and Contact </aside>

Getting Started 🎯

Before using XFUEL, ensure you have the following:

1. Wallet: A crypto wallet compatible with the CrossFi blockchain, such as Metamask or any other EVM-compatible wallet.
2. CrossFi Network Configuration:
   • Testnet: Chain ID 4157
   • Mainnet: Chain ID 4158
   • Refer to the CrossFi Wallet Configuration Guide for setup instructions.
3. Supported Browser: Modern browsers like Chrome, Firefox, or Edge for accessing the XFUEL web app.

Supported Wallets

XFUEL supports wallets that can:

1. Connect to the CrossFi network.
2. Sign EIP-2612 messages, a prerequisite for off-chain permit-based transactions.

Commonly supported wallets include:

• Metamask
• Trust Wallet
• WalletConnect-Compatible Wallets

How XFUEL Works

1. For Users: XFUEL allows you to send tokens without paying gas fees. The process involves signing an off-chain transaction, which is executed by a sponsor on your behalf.
2. For Sponsors: Sponsors subsidize gas fees for specific tokens, defining limits and usage policies. This creates a gasless experience for users while promoting token usage.

Quick Start Guide

For Users

1. Log In:

   • Open the XFUEL Web App.
   • Log in using your wallet via the Thirdweb integration.

2. Select a Token:

• Choose from the list of registered tokens provided by the sponsor.

1. Check Balance:
   • View your wallet’s balance for the selected token.
2. Enter Transaction Details:
   • Specify the amount and recipient address.
   • Use the QR code scanner for faster input if needed.
3. Sign and Submit:
   • Sign an EIP-2612 message with your wallet.
   • Submit the transaction.
4. View Result:
   • Upon success, receive a transaction hash and link to the CrossFi block explorer.
   • In case of errors, view the error reason and retry.

For Sponsors

1. Log In:
   • Open the XFUEL admin panel.
   • Log in using your Thirdweb wallet.
2. Register a New Token:
   • Enter the token’s contract address and upload an icon.
   • The system verifies the token’s EIP-2612 compliance and retrieves its name and ticker.
3. Fund the Wallet:
   • Deposit funds into the XFUEL pool to sponsor gas fees.
4. Set Limits:
   • Define spending caps to manage token distribution and prevent abuse.
5. Monitor Usage:
   • Use the admin dashboard to track the balance and transaction history.