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Auction and Fixed Price — NFT Marketplace Smart Contract — Complete Solidity Implementation With Auction and Fixed Price
// SPDX-License-Identifier: MIT pragma solidity ^0.8.20; import "@openzeppelin/contracts/token/ERC721/IERC721.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/common/ERC2981.sol"; import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; import "@openzeppelin/con...
Common integrations: The Graph, Alchemy/Infura, OpenZeppelin Defender, and popular wallet providers.
Clarify requirements, compliance needs, architecture risks, and launch goals.
Implement core contracts, integrations, product flows, tests, and deployment automation.
Run QA, prepare audit handoff, deploy infrastructure, and support production rollout.
Without a cap, a malicious NFT contract could return a 100% royalty, draining the buyer's payment. The 10% cap protects buyers from malicious NFT contracts while still enforcing legitimate creator royalties.
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