How do you implement gas fee optimization in a DeFi wallet?

Problem Faced:
Users often face high gas fees and failed transactions due to incorrect gas estimations.

Solution:
Use EIP-1559 transactions to dynamically adjust gas fees (maxFeePerGas, maxPriorityFeePerGas).
Implement Gasless transactions (Meta-transactions) using EIP-2771 and Gas Relayers (e.g., OpenZeppelin Defender).
Use Layer 2 networks (Arbitrum, Optimism, zkSync) for lower fees.

javascript

const tx = {
  to: recipient,
  value: ethers.parseEther("0.1"),
  gasLimit: 21000,
  maxFeePerGas: ethers.parseUnits("50", "gwei"),
  maxPriorityFeePerGas: ethers.parseUnits("2", "gwei")
};
await wallet.sendTransaction(tx);

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