Solidity contract marketplace extension for ERC721 (NFTs)

Bid and ask mechanism to buy and sell NFTs token.

Install

$ npm i erc721-marketplace --save

Getting started

Extend your contact with ERC721Maket.sol. Constructor receives the platform cut represented by points between 0-1000 where 100 is 1%, 1000 is 10% and 10000 is 100%.

import "erc721-marketplace/ERC721/extensions/ERC721Market.sol";

contract NFTContract is ERC721Market {
  constructor(
    string memory name,
    string memory symbol,
    string memory baseURI,
    uint256 cut
  ) ERC721(name, symbol) ERC721Market(cut) {}
}

Buy or sell a NFT

There are 3 ways of transfering ownership of a token. Offering for sale, bidding it or a simple transfer of ownership without any payment.

Check IERC721Market.sol interface for more information.

Platform cut

By default, the cut will be locked in the contract address, but you can override _calculateCut function to customise with your own share distribution.

function calculateCut(uint256 amount, uint256 cut)
  internal
  pure
  override
  returns (MarketCut[] memory)
{
  MarketCut[] memory fees = new MarketCut[](2);

  // primary benefitiary

  fees[0] = MarketCut(
    address(0xD51cf74a5CD2029CDF0d107D5239FcCdfFeC2008),
    computeCut(amount, 150) // 1.5%
  );

  // secondary

  fees[1] = MarketCut(
    address(0x021cFEEe4a9F5336D14C5173d811aB8fE3829B77),
    computeCut(amount, 100) // 1%
  );

  return fees;
}

• Every confirmed sale will call this function if cut amount is greather than 0.

What in here so far

• Built on top of ERC721 openzeppelin contract
• Based on CryptoPunk marketplace contract
• Using TypeChain to generate types from solidity contracts