ChainPay - Automatic Payroll

Inspiration

Traditional payroll systems are expensive, centralized, and require manual intervention. I saw an opportunity to leverage blockchain for an automated solution that eliminates intermediaries and guarantees on-time payments.

What it does

ChainPay is a decentralized payroll manager on Ethereum. Employers deposit funds, register employees with custom salaries and payment frequencies, and Chainlink Automation handles the rest, automatically processing payments when due with zero manual intervention.

How I built it

• Smart Contracts: Solidity ^0.8.19 with OpenZeppelin security libraries
• Automation: Chainlink Keepers via checkUpkeep() and performUpkeep()
• Development: Foundry framework
• Deployment: Verified on Ethereum Sepolia testnet

Challenges that I ran into

• Gas optimization for batch payment processing
• Chainlink Automation configuration with proper gas limits

Accomplishments that I'm proud of

• Fully functional automated payroll system deployed on Sepolia
• Robust security using OpenZeppelin standards
• Scalable design handling hundreds of employees

What I learned

• Chainlink Automation architecture and keeper networks
• Real-world blockchain application design for scalability

What's next for ChainPay - Automatic Payroll

• Multi-token support (USDC, etc.) for price stability
• Employee self-service web portal
• Multi-chain deployment for lower costs

Built With

• alchemyapi
• chainlink
• etherscan
• foundry
• solidity
• visual-studio