Smart Contract

SHIM Token Smart Contract Analysis

Contract Overview

The SHIM token is an ERC-20 token with additional features like fee mechanisms, trading limits, and liquidity functions. It's designed to work with Uniswap V2 and includes anti-whale measures.

Core Functions

1. Constructor

constructor () ERC20("ShimaNest", "SHIM")

• Initializes the token with name "ShimaNest" and symbol "SHIM"

• Sets up router addresses for different chains (BSC mainnet/testnet, ETH mainnet/testnet)

• Transfers ownership to 0x4F69F9cEDC6Cf0db1AF4DdCE364DcD9EEB1408dF

• Creates Uniswap V2 pair

• Sets initial fees (3% liquidity, 2% marketing on both buy/sell)

• Configures wallet/transaction limits

• Mints 20 billion tokens to owner

• Disables trading initially

2. Fee Management Functions

updateBuyFees()

function updateBuyFees(uint256 _liquidityFeeOnBuy, uint256 _marketingFeeOnBuy)

• Allows owner to update buy fees

• Ensures total fees don't exceed 10%

• Emits UpdateBuyFees event

updateSellFees()

function updateSellFees(uint256 _liquidityFeeOnSell, uint256 _marketingFeeOnSell)

• Similar to updateBuyFees but for sell transactions

• Also caps total fees at 10%

updateWalletToWalletTransferFee()

function updateWalletToWalletTransferFee(uint256 _walletToWalletTransferFee)

• Sets fee for wallet-to-wallet transfers (non-dex transactions)

• Maximum fee capped at 5%

3. Wallet Management Functions

changeMarketingWallet()

function changeMarketingWallet(address _marketingWallet)

• Allows owner to change marketing wallet address

• Prevents setting to zero address

• Emits MarketingWalletChanged event

excludeFromFees()

function excludeFromFees(address account, bool excluded)

• Excludes/includes account from fees

• Only callable by owner

• Emits ExcludeFromFees event

4. Trading Functions

enableTrading()

function enableTrading()

• Activates trading (initially disabled)

• Also enables swapping functionality

• Can only be called once

_transfer() (Internal)

function _transfer(address from, address to, uint256 amount)

• Main transfer function with all fee logic

• Checks trading status and limits

• Handles fee collection and redistribution

• Implements anti-whale measures

• Processes swaps when thresholds are met

5. Liquidity Functions

swapAndLiquify()

function swapAndLiquify(uint256 tokens)

• Internal function that:

  1. Swaps half of tokens for ETH

  2. Adds liquidity with other half of tokens and received ETH

  3. Sends LP tokens to dead address

• Emits SwapAndLiquify event

swapAndSendMarketing()

function swapAndSendMarketing(uint256 tokenAmount)

• Swaps tokens for ETH

• Sends ETH to marketing wallet

• Emits SwapAndSendMarketing event

6. Limit Management Functions

Max Wallet Limits:

function setEnableMaxWalletLimit(bool enable)
function setMaxWalletAmount(uint256 _maxWalletAmount)
function excludeFromMaxWallet(address account, bool exclude)

• Enable/disable wallet limit

• Set max wallet amount (min 1% of supply)

• Exclude addresses from limit

Max Transaction Limits:

function setEnableMaxTransactionLimit(bool enable)
function setMaxTransactionAmounts(uint256 _maxTransactionAmountBuy, uint256 _maxTransactionAmountSell)
function excludeFromMaxTransactionLimit(address account, bool exclude)

• Similar to wallet limits but for transactions

• Minimum 0.1% of supply for both buy/sell limits

7. Utility Functions

claimStuckTokens()

function claimStuckTokens(address token)

• Allows owner to recover accidentally sent tokens

• Cannot recover the token itself

setSwapTokensAtAmount()

function setSwapTokensAtAmount(uint256 newAmount)

• Sets threshold for auto-swapping accumulated fees

• Must be > 0.0001% of total supply

setSwapEnabled()

function setSwapEnabled(bool _enabled)

• Toggles whether fee auto-swapping is active

Key Features

1. Fee Mechanism:

   • Different fees for buying/selling (default 5% total)

   • Separate wallet-to-wallet transfer fee

   • Fees are split between liquidity and marketing

2. Anti-Whale Protection:

   • Max wallet limit (default 2%)

   • Max transaction limits (default 1% buy/sell)

3. Liquidity Management:

   • Automatic LP creation from fees

   • Marketing fees converted to ETH

4. Security Measures:

   • Trading initially disabled

   • Owner can exclude addresses from limits/fees

   • Prevents setting dangerous limits (<0.1%)

5. Multi-Chain Support:

   • Detects chain ID to use correct router addresses

   • Supports BSC and Ethereum mainnets/testnets

Events

The contract emits several events for important state changes:

• Fee updates

• Wallet/limit changes

• Swap activities

• Exclusions from limits/fees

• Ownership transfers (from Ownable)

This comprehensive token contract includes robust features for DeFi trading while implementing protections against common issues like whale manipulation and providing flexibility for fee adjustments.