Lazy Mint

The LazyMint smart contract extension is meant to be used with any ERC721 or ERC1155 NFT smart contract. It lets you 'lazy mint' any number of NFTs at once.

'Lazy minting' means defining the metadata of NFTs without minting it to an address. Regular 'minting’ of NFTs means actually assigning an owner to an NFT. As a contract admin, this lets you prepare the metadata for NFTs that will be minted by an external party, without paying the gas cost for actually minting the NFTs.

View Smart Contract

Import

import "@thirdweb-dev/contracts/extension/LazyMint.sol";

Available functionality

Functionality	Description
lazyMint	Prepare the metadata for NFTs that will be minted by an external party, without paying the gas cost for actually minting the NFTs.
_canLazyMint	Defines the criteria a wallet must meet to be able to lazy mint NFTs.

Implementing the Contract extension.

Import the contract extension and make your contract inherit it.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@thirdweb-dev/contracts/base/ERC721Base.sol";
import "@thirdweb-dev/contracts/extension/LazyMint.sol";

contract MyNFT is ERC721Base, LazyMint {
    /**
     *  We store the contract deployer's address only for the purposes of the example
     *  in the code comment below.
     *
     *  Doing this is not necessary to use the `LazyMint` extension.
     */
    address public deployer;

    constructor(
        string memory _name,
        string memory _symbol,
        address _royaltyRecipient,
        uint128 _royaltyBps
    ) ERC721Base(_name, _symbol, _royaltyRecipient, _royaltyBps) {
        deployer = msg.sender;
    }

    /**
     *  Here we override the `mintTo` function made available by the `ERC721Base` contract.
     *
     *  We make it so that anyone can mint tokens that have already been lazy minted.
     */
    function mintTo(address _to, string memory) public virtual override {
        uint256 quantity = 1;
        require(
            nextTokenIdToMint() + quantity <= nextTokenIdToLazyMint,
            "Not enough lazy minted tokens."
        );

        _safeMint(_to, quantity, "");
    }

    /**
     *  This function returns who is authorized to lazy mint NFTs on your contract.
     *
     *  As an EXAMPLE, we'll only allow the contract deployer to lazy mint NFTs.
     *
     *  You MUST complete the body of this function to use the `LazyMint` extension.
     */
    function _canLazyMint() internal view virtual override returns (bool) {
        return msg.sender == deployer;
    }
}

Unlocked Features

On the dashboard, you'll be able to lazy mint NFTs by batch uploading metadata files.

Batch Uploading NFT Metadata Guide

Within the SDK, you can pass an array of NFT metadata objects to batch lazy mint them

Lazy Minting in the SDK