NFT Marketplace Smart Contract

Overview

This Ethereum smart contract is a decentralized marketplace tailored for Non-Fungible Tokens (NFTs), providing a comprehensive suite of features for buying, selling, and auctioning unique digital assets. Additionally, it introduces the concept of unlisted NFTs with bidding functionality, offering users a versatile platform to engage with digital collectibles.

Features

1. Fixed-Price Sales

• Listing Items: Users can effortlessly list NFTs for sale by providing the contract address, token ID, and a specified price.
• Purchase Mechanism: Buyers can seamlessly acquire NFTs by executing the purchase function, initiating both the fund transfer and NFT ownership transfer.

2. Auctions

• Auction Creation: Sellers can set up auctions using the createAuction function, specifying the contract address, token ID, starting price, duration, and the NFT type (ERC721 or ERC1155).
• Bid Placement: Bidders can actively participate in ongoing auctions by placing bids using the placeBid function.
• Completion and Settlement: Upon the conclusion of an auction, the seller can execute acceptBid to complete the transaction, transferring both funds and NFT ownership to the highest bidder.

3. Unlisted NFTs

• Unlisting NFTs: Owners can opt to unlist NFTs, opening them up for bids through the placeUnlistedBid function.
• Bidding on Unlisted NFTs: Users can place bids on unlisted NFTs, fostering a dynamic environment.
• Bid Acceptance: The owner can accept the highest bid using acceptUnlistedBid, facilitating the transfer of the NFT and the corresponding funds.

4. Marketplace Fee

• Configurable Fee: The smart contract incorporates a customizable marketplace fee (expressed as a percentage) on transactions.

5. Admin Functions

• Funds Management: The contract owner possesses exclusive rights to add funds (addFunds) and withdraw funds (withdrawFunds).
• Marketplace Fee Adjustment: The owner can dynamically set or update the marketplace fee through the setMarketplaceFee function.

How to Use

Fixed-Price Sales

1. Utilize listForSale to place an NFT for sale by providing its contract address, token ID, and the desired price.
2. Interested buyers can execute purchase with the item ID to complete the purchase transaction.

Auctions

1. Initiate an auction with createAuction by specifying the contract address, token ID, starting price, duration, and NFT type.
2. Bidders actively participate in ongoing auctions by calling placeBid.
3. Upon the auction's conclusion, the seller executes acceptBid to finalize the auction, transferring funds and NFT ownership.

Unlisted NFTs

1. Owners can unlist an NFT using placeUnlistedBid.
2. Users bid on unlisted NFTs, with the owner able to accept the highest bid through acceptUnlistedBid.

Admin Functions

• Contract owners can add funds using addFunds.
• Withdraw funds using withdrawFunds.
• Adjust the marketplace fee with setMarketplaceFee.

Important Notes

• Ensure your Ethereum wallet is connected for interactions.
• Deploy on Ethereum Mainnet or Testnets.

Live Demo

Explore the live demo of the NFT Marketplace

License

This smart contract is open-source and released under the MIT License. Feel free to explore, contribute, and integrate it into your projects.

NFT MarketPlace Project

This project demonstrates a basic Hardhat use case. It comes with a sample contract, a test for that contract, and a script that deploys that contract.

Try running some of the following tasks:

npx hardhat help
npx hardhat test
REPORT_GAS=true npx hardhat test
npx hardhat node
npx hardhat run scripts/deploy.js