The problem GreenFi – Earn & Grow Green solves

The Problem It Solves

Traditional DeFi platforms focus only on profits and ignore their environmental impact .

• Most users don’t have an easy way to invest in crypto and contribute to real-world causes like reducing carbon emissions or funding renewable energy.

GreenFi solves this by connecting DeFi with sustainability:

• Each staking transaction automatically donates a small yield portion to verified carbon offset projects.

• Users can earn passive income while helping the planet.

• Every user receives a Green Staker NFT that shows how much CO₂ they helped offset.

A leaderboard motivates eco-friendly competition and awareness.

In short — GreenFi makes crypto staking not just profitable, but also planet-positive

Challenges we ran into

While building GreenFi, we faced several hurdles:

Blockchain Integration:

• Connecting the smart contract on Polygon Mumbai Testnet and ensuring seamless interaction with MetaMask took time to debug

Automated Yield Redirection:

• Designing the logic to automatically split staking rewards between the user and the donation pool was tricky — we had to carefully test percentage calculations in Solidity.

IPFS Storage for NFTs:

• Uploading metadata and images to nft.storage (IPFS) and linking them correctly with minted NFTs required multiple trials.

Chainlink Oracle Setup:

• Fetching real-time verified carbon project data to make donations transparent needed proper oracle integration.

Despite the challenges, we overcame them by testing on Mumbai Testnet, using Alchemy RPC, and deploying step-by-step through Hardhat.