WPAYIN Smart Contract

OFFICIAL CONTRACT: 0x28450F5b5576c19cc1FD90fA84EDcf893d136624

Overview

The WPAYIN smart contract represents an ERC-20 token called WPAYIN (symbol: WPI). WPAYIN serves as a cross-chain wallet solution, bridging blockchain ecosystems like Ethereum, TON, and Bitcoin, and offering users a unified, seamless experience.

The contract implements essential ERC-20 functions, along with custom transaction fees, wallet and transfer limits, and Uniswap liquidity integration.

Token Details

• Name: WPAYIN
• Symbol: WPI
• Decimals: 9
• Total Supply: 100,000,000 WPI

Key Components

Libraries

• SafeMath: Provides safe arithmetic operations (addition, subtraction, multiplication, division) to prevent overflow errors.

Interfaces

• IERC20: Defines the ERC-20 standard functions for token transfers, approvals, and balance checks.
• IUniswapV2Factory: Interface for Uniswap’s factory, used to create token pairs.
• IUniswapV2Router02: Interface for Uniswap’s router, enabling token swaps and liquidity functions.

Contracts

1. Context: Provides information about the current execution context, including the sender of the transaction.
2. Ownable: Adds an owner role with specific permissions like setting fees and opening trading. This contract includes functions to transfer or renounce ownership.
3. WPAYIN: The main contract implementing the ERC-20 standard and additional functionality for WPAYIN tokens:
   • ERC-20 Functions: Includes transfer, approve, and transferFrom for standard token interactions.
   • Custom Modifiers:
     • checkMaxWallet: Enforces a maximum holding per wallet.
     • checkMaxTransfer: Limits maximum transfer amount per transaction.
     • lockTheSwap: Prevents reentrancy attacks during swap operations.
   • Events:
     • MaxTxAmountUpdated: Emitted when the max transaction limit is updated.
     • TransferTaxUpdated: Emitted when the transaction fee is changed.
     • FeesCollected: Emitted whenever transaction fees are collected.
     • FeeRecipient2Updated: Emitted when the secondary fee recipient is changed.
     • LimitsRemoved: Emitted when max wallet and transfer limits are removed.

Main Functionalities

Fees and Limits

• Transaction Fees: 3% transaction fee on each transfer, split equally between two predefined addresses (feeRecipient1 and feeRecipient2).
• Maximum Wallet Limit: Each wallet can hold no more than 1% of the total token supply.
• Maximum Transaction Limit: Limits each transfer to a maximum of 1% of the total supply.

Uniswap Integration and Trading

• openTrading: Enables trading on Uniswap by creating a WPI-ETH pair and adding initial liquidity.
  • Sets tradingOpen to true and enables swapEnabled.
  • Adds 2 ETH and 60% of the total token supply to the Uniswap pool.
• swapExactTokensForETHSupportingFeeOnTransferTokens: Supports Uniswap token swaps with fees applied to each transfer.

Owner Functions

• setMaxWalletSize: Updates the maximum wallet size.
• setMaxTransferSize: Updates the maximum transfer size.
• excludeFromFees: Excludes specific addresses from transaction fees.
• setTransactionFee: Modifies the transaction fee, capped at 100% as a safeguard.
• setFeeRecipient2: Updates the secondary fee recipient.
• removeLimits: Removes max wallet size and transfer size restrictions.

Additional Security

The contract uses the SafeMath library to prevent overflow errors and adheres to the Checks-Effects-Interactions pattern, ensuring state changes occur before external calls to minimize reentrancy risks.

Contract Summary

The WPAYIN contract provides a flexible token system with built-in liquidity and fee management, designed to facilitate secure trading on decentralized exchanges. The WPAYIN ecosystem is adaptable for cross-chain integration, enhancing user experience while maintaining security and stability.

---

For more information, visit the WPAYIN Documentation.