minenations-contract

An ERC-721 NFT minting contract (MineNationsMint) where mints are paid in wETH (an ERC-20 token) instead of native ETH. It supports a whitelist tier with discounted pricing and lower per-wallet limits.

Overview

The contract is built on OpenZeppelin 4.x and lives in a single file, Mint.sol.

• Name / symbol: MineNations / MNT
• Max supply: 10,000 tokens
• Payment token: wETH at 0x9c3C9283D3e44854697Cd22D3Faa240Cfb032889
• Metadata: https://ipfs.io/ipfs/QmcnforHyWMorTv437YMXQ9594TuG7JsfyTaDFSVdLX9Z1/<tokenId>.json

Pricing and limits

Tier	Price per token	Max per wallet
Whitelisted	0.05 wETH	2
Public	0.06 wETH	5

Contract API

Public

• mintItem(uint256 _count, uint256 _amount) - Mints _count tokens to the caller. _amount must equal _count * price for the caller's tier, and the caller must have approved the contract to spend at least _amount wETH beforehand. Reverts if _count is 0, the supply cap would be exceeded, or the per-wallet limit would be exceeded.
• totalSupply() - Returns the number of tokens minted so far.
• tokenURI(uint256 tokenId) - Returns the IPFS metadata URI for a token.
• ownWallet(address) - Number of tokens minted by an address.
• whitelisted(address) - Whether an address is on the whitelist.

Owner only

• addWhitelistUser(address _user) - Adds an address to the whitelist.
• removeWhitelistUser(address _user) - Removes an address from the whitelist.
• withdraw() - Transfers the contract's entire wETH balance to the owner.

Minting flow

1. The buyer approves the contract to spend wETH: wETH.approve(contractAddress, amount).
2. The buyer calls mintItem(count, amount) with amount = count * price.
3. The contract pulls amount wETH via safeTransferFrom and mints count tokens to the buyer.

Security notes

• wETH transfers use OpenZeppelin's SafeERC20, so failed transfers revert.
• mintItem is protected by ReentrancyGuard (nonReentrant), since _safeMint calls back into the recipient via onERC721Received.
• Owner-only actions are gated by OpenZeppelin's Ownable.

Development

There is no build toolchain checked into this repository yet. The contract targets Solidity ^0.8.0 and depends on @openzeppelin/contracts (4.x). To compile and test it, set up a project with a tool such as Foundry or Hardhat and install OpenZeppelin:

npm install @openzeppelin/contracts@^4.9.0

License

MIT