NFT Marketplace

Solidity NFT marketplace project for Elephant-token NFT sales.

Contract

contracts/ElephantNFTMarketplace.sol lets the owner approve ERC-721 metadata collections, users list approved NFTs for Elephant token, and buyers purchase active listings.

Constructor arguments:

• elephantToken_ - ERC-20 token address used for marketplace payments
• devAddress_ - address receiving the 1% marketplace fee

Sale proceeds default to 99% for the seller and 1% for the dev address. The owner can update the dev fee with setDevFeeBps, capped at 10%. Each listing stores the fee active when it is created, so fee changes apply to future listings. Listed NFTs are held in marketplace escrow until they are bought or cancelled.

Readable metadata helpers:

• getCollection(collection) - approval status, stored collection name, and collection metadata URI
• getTokenMetadata(collection, tokenId) - stored collection name and ERC-721 tokenURI
• getListingDetails(listingId) - listing data plus collection name and tokenURI

Scripts

• npm run compile - compile Solidity contracts with Waffle into build/
• npm test - compile contracts and run the Mocha test suite
• npm run clean - remove Waffle build artifacts

Installed Tooling

• Ethereum Waffle
• Mocha and Chai test stack
• OpenZeppelin Contracts
• OpenZeppelin Contracts Upgradeable