The contracts directory provides interfaces and implementations of EIP token standards. All payable methods are writen for minimal gas consumption.

Automated tests execute standalone with npx hardhat test. Hardhat itself can be obtained with npm install --save-dev hardhat.

This is free and unencumbered software released into the public domain.

A FixedNFTSet deployement costs 837 k gas.

Token transfers come in 3 variations.

1. A plain transferFrom as the onwer of a token costs 49 k gas.
2. An approve costs 48 k gas, with another 48 k gas on tranferFrom.
3. A setApprovalForAll costs 46 k gas, with another 49 k gas on tranferFrom.

The NFTBuyout contract is ready on the following chains. Please share when you deploy on a chain not listed here.

• Mainnet
• Sepolia

Custom tokens can simply inherit the FixedNFTSet contract. It is recommended to import contracts with a versioned path only.

// SPDX-License-Identifier: CC0-1.0
pragma solidity >=0.8.13;

import "https://github.com/pascaldekloe/enft/blob/v1.2.0/contracts/FixedNFTSet.sol";


// NFT example with 12 tokens.
contract MyDozen is FixedNFTSet {

// Constructor assigns all 12 tokens to the receiver address.
constructor(address receiver) FixedNFTSet(12, receiver) {
	// initial Transfer emission is optional
	for (uint token = 0; token < 12; token++) {
		emit Transfer(address(0), receiver, token);
	}
}

}

For a full NFT example with metadata and more, see CollectiblesSale on mainnet.

In a Node.js environment you can use the contracts in a project with npm install https://github.com/pascaldekloe/enft.git, and then import with import "enft/contracts/ERC721.sol"; instead of the HTTP URL.

• “Token Standard” EIP-20
• “Non-Fungible Token Standard” EIP-721