How to Recover Stuck Yield Farming Transactions: Gas Price Solutions

// Check current gas prices
const gasPrice = await web3.eth.getGasPrice();
const recommendedGasPrice = gasPrice * 1.2; // 20% increase

// Replace stuck transaction with higher gas price
const newTransaction = {
  from: account,
  to: contractAddress,
  value: amount,
  gasPrice: recommendedGasPrice,
  nonce: originalNonce // Use same nonce as stuck transaction
};

const signedTx = await web3.eth.accounts.signTransaction(newTransaction, privateKey);
const receipt = await web3.eth.sendSignedTransaction(signedTx.rawTransaction);

// Cancel stuck transaction
const cancelTransaction = {
  from: userAddress,
  to: userAddress, // Send to yourself
  value: 0,
  gasPrice: stuckTxGasPrice * 1.1,
  nonce: stuckTxNonce
};

// This replaces the stuck transaction
await web3.eth.sendTransaction(cancelTransaction);

// Fetch current gas prices from multiple sources
async function getOptimalGasPrice() {
  const sources = [
    'https://ethgasstation.info/api/ethgasAPI.json',
    'https://gas-api.metaswap.codefi.network/networks/1/suggestedGasFees'
  ];
  
  const gasPrices = await Promise.all(
    sources.map(url => fetch(url).then(res => res.json()))
  );
  
  // Calculate median gas price for reliability
  const medianGasPrice = calculateMedian(gasPrices.map(data => data.fast));
  
  return {
    safe: medianGasPrice * 0.9,
    standard: medianGasPrice,
    fast: medianGasPrice * 1.2
  };
}

// Automated transaction recovery contract
contract TransactionRecovery {
    mapping(address => uint256) public userNonces;
    
    function executeWithRecovery(
        address target,
        bytes calldata data,
        uint256 gasLimit
    ) external {
        uint256 currentNonce = userNonces[msg.sender];
        
        // Attempt transaction with current gas price
        (bool success,) = target.call{gas: gasLimit}(data);
        
        if (!success) {
            // Retry with 20% higher gas price
            uint256 higherGasPrice = tx.gasprice * 120 / 100;
            target.call{gas: gasLimit}(data);
        }
        
        userNonces[msg.sender] = currentNonce + 1;
    }
}

// Deploy recovery contract and use for yield farming
const recoveryContract = new web3.eth.Contract(recoveryABI, recoveryAddress);

// Execute yield farming transaction with automatic recovery
await recoveryContract.methods.executeWithRecovery(
  yieldFarmContract.address,
  yieldFarmData,
  200000 // Gas limit
).send({
  from: userAddress,
  gasPrice: currentGasPrice
});

// Dynamic gas price adjustment based on network conditions
class GasPriceManager {
  constructor(web3) {
    this.web3 = web3;
    this.baseFee = null;
    this.priorityFee = null;
  }
  
  async updateGasPrices() {
    const latestBlock = await this.web3.eth.getBlock('latest');
    this.baseFee = latestBlock.baseFeePerGas;
    
    // Calculate priority fee based on recent blocks
    const recentBlocks = await this.getRecentBlocks(10);
    this.priorityFee = this.calculateOptimalPriorityFee(recentBlocks);
  }
  
  getRecommendedGasPrice(urgency = 'standard') {
    const multipliers = {
      safe: 1.0,
      standard: 1.1,
      fast: 1.3
    };
    
    return (this.baseFee + this.priorityFee) * multipliers[urgency];
  }
}

// Use private mempool services to avoid MEV attacks
const flashbotsProvider = new providers.FlashbotsBundle(
  process.env.FLASHBOTS_RELAY_URL
);

// Submit transaction bundle with MEV protection
const signedBundle = await flashbotsProvider.sendBundle([
  {
    transaction: stuckTransaction,
    signer: wallet
  }
], targetBlockNumber);

// Submit transaction with multiple gas prices
async function submitMultipleTransactions(transaction) {
  const gasPrices = [
    currentGasPrice,
    currentGasPrice * 1.1,
    currentGasPrice * 1.2
  ];
  
  const promises = gasPrices.map((gasPrice, index) => {
    return setTimeout(() => {
      return web3.eth.sendTransaction({
        ...transaction,
        gasPrice,
        nonce: transaction.nonce
      });
    }, index * 30000); // 30-second delays
  });
  
  // First successful transaction wins
  return Promise.race(promises);
}

// Monitor transaction status with alerts
class TransactionMonitor {
  constructor(web3, alertCallback) {
    this.web3 = web3;
    this.alertCallback = alertCallback;
    this.monitoredTxs = new Map();
  }
  
  addTransaction(txHash, alertAfterMinutes = 10) {
    this.monitoredTxs.set(txHash, {
      startTime: Date.now(),
      alertThreshold: alertAfterMinutes * 60 * 1000
    });
    
    this.checkTransaction(txHash);
  }
  
  async checkTransaction(txHash) {
    const tx = this.monitoredTxs.get(txHash);
    if (!tx) return;
    
    const receipt = await this.web3.eth.getTransactionReceipt(txHash);
    
    if (receipt) {
      // Transaction confirmed
      this.monitoredTxs.delete(txHash);
      return;
    }
    
    // Check if alert threshold exceeded
    if (Date.now() - tx.startTime > tx.alertThreshold) {
      this.alertCallback(txHash, 'Transaction stuck - consider speeding up');
    }
    
    // Check again in 30 seconds
    setTimeout(() => this.checkTransaction(txHash), 30000);
  }
}

// Get correct nonce for stuck transaction recovery
async function getCorrectNonce(address) {
  const [networkNonce, pendingNonce] = await Promise.all([
    web3.eth.getTransactionCount(address, 'latest'),
    web3.eth.getTransactionCount(address, 'pending')
  ]);
  
  // Use network nonce if no pending transactions
  return pendingNonce > networkNonce ? pendingNonce : networkNonce;
}

// Calculate optimal gas price based on transaction value
function calculateOptimalGasPrice(transactionValue, currentGasPrice) {
  const gasCostUSD = (currentGasPrice * 21000) / 1e18 * ethPriceUSD;
  const transactionValueUSD = transactionValue * tokenPriceUSD;
  
  // Don't spend more than 2% of transaction value on gas
  const maxAcceptableGas = transactionValueUSD * 0.02;
  
  if (gasCostUSD > maxAcceptableGas) {
    return null; // Wait for lower gas prices
  }
  
  return currentGasPrice;
}

// Uniswap V3 position recovery
const positionManager = new ethers.Contract(
  NONFUNGIBLE_POSITION_MANAGER_ADDRESS,
  positionManagerABI,
  signer
);

// Recover stuck liquidity provision
const recoverParams = {
  tokenId: stuckPositionId,
  deadline: Math.floor(Date.now() / 1000) + 1800, // 30 minutes
};

await positionManager.decreaseLiquidity(recoverParams, {
  gasPrice: await getOptimalGasPrice()
});