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EventWinner Smart Contract

A Solidity smart contract implementation that demonstrates external contract interaction on the Ethereum blockchain.

This is the answer to stackoverflow question: Error: cannot estimate gas; transaction may fail or may require manual gas limit (Sepolia test Network)

Overview

The EventWinner project showcases a smart contract that can interact with other contracts through their interfaces. It implements a pattern for making external calls to contracts that expose an attempt() function.

Technical Stack

  • Solidity ^0.8.27
  • Hardhat
  • TypeScript
  • Ethers.js

Contract Architecture

EventWinner.sol

The main contract contains:

  • Interface definition for target contracts
  • External function to interact with other contracts
  • Low-level call implementation for robust contract interaction

Key Features

  • External contract interaction
  • Interface-based calling
  • Gas-efficient implementation
  • Error handling

Usage

The contract can be used to interact with any contract that implements the attempt() function:

// Get contract instance
const eventWinner = await EventWinner.deploy();

// Call target contract
await eventWinner.callWinner(targetContractAddress);

Development

  1. Clone the repository
git clone https://github.com/BTC415/EventWinner.git
  1. Install dependencies:
npm install
  1. Compile contracts:
npx hardhat compile
  1. Run deployment script:
npx hardhat run scripts/deploy.ts --network sepolia

Network support

  • Sepolia
  • Local hardhat Network

License

This project is licensed under the MIT License.