Chainlink CCIP Gas Estimation and TransferUSDC Update

This repository contains a script to estimate the gas consumption of the ccipReceive function and increase the gas limit for the transferUsdc function by 10%. The increased gas limit is used to ensure the transferUsdc function has enough gas for execution.

Project Structure

• GasEstimate.ts: This script estimates the gas used by the ccipReceive function, increases it by 10%, and logs the results.
• config.ts: Configuration file for the CCIP settings.
• helper.ts: Helper functions for building transaction data and estimating intrinsic gas.

Prerequisites

• Node.js
• npm
• An Ethereum Sepolia RPC URL (place it in a .env file)

Getting Started

1. Clone the Repository:

   git clone https://github.com/Signor1/ccipreceive-gaslimit.git
   cd ccipreceive-gaslimit

2. Install Dependencies:

   npm install

3. To address an issue with importing CrossChainReceiver__factory from '../typechain-types', you need to ensure that the TypeScript type definitions have been correctly generated and are available in the specified path.

   npx hardhat typechain 

4. Set Up Environment Variables:

   For the script, create a .env file in the root of your project and add your Ethereum Sepolia RPC URL:

   ETHEREUM_SEPOLIA_RPC_URL=<Your Ethereum Sepolia RPC URL>

5. Run the Script:

   Use the following command to estimate the gas usage and calculate the increased gas limit:

   npm run estimate

   The script will output the estimated gas used by the ccipReceive function and the increased gas limit.

Usage Example

The script will log the following:

• The estimated gas used by the ccipReceive function.
• The gas limit after applying a 10% increase.

You can then use the increasedGasLimit in the transferUsdc contract function as shown in the commented section of the script:

const transferUsdcTx = await transferUsdcContract.transferUsdc(
  destinationChainSelector,
  receiverAddress,
  amount,
  increasedGasLimit.toString()
);