Address Contract Partially Verified
Address
0xF55D96735Fa22ba1C119bA37aF76C2c4E3BeC224
Balance
0 ETH
Nonce
1
Code Size
22089 bytes
Creator
0x65C3d0F9...02b8 at tx 0x3b9fc602...63ddac
Indexed Transactions
0
Contract Bytecode
22089 bytes
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Verified Source Code Partial Match
Compiler: v0.8.19+commit.7dd6d404
EVM: paris
Optimization: No
Marketplace.sol 826 lines
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns(bool);
}
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^ 0.8.0;
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/
abstract contract ERC165 is IERC165 {
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns(bool) {
return interfaceId == type(IERC165).interfaceId;
}
}
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol)
pragma solidity ^ 0.8.0;
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns(uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns(address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(address from, address to, uint256 tokenId) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
* or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
* understand this adds an external call which potentially creates a reentrancy vulnerability.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(address from, address to, uint256 tokenId) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool approved) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns(address operator);
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns(bool);
}
// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)
pragma solidity ^ 0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor() {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and making it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
_nonReentrantBefore();
_;
_nonReentrantAfter();
}
function _nonReentrantBefore() private {
// On the first call to nonReentrant, _status will be _NOT_ENTERED
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
}
function _nonReentrantAfter() private {
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
/**
* @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
* `nonReentrant` function in the call stack.
*/
function _reentrancyGuardEntered() internal view returns(bool) {
return _status == _ENTERED;
}
}
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
pragma solidity ^ 0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns(uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns(uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, uint256 amount) external returns(bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns(uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns(bool);
/**
* @dev Moves `amount` tokens from `from` to `to` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address from, address to, uint256 amount) external returns(bool);
}
error PriceNotMet(address nftAddress, uint256 tokenId, uint256 price);
error ItemNotForSale(address nftAddress, uint256 tokenId);
error NotListed(address nftAddress, uint256 tokenId);
error AlreadyListed(address nftAddress, uint256 tokenId);
error NoProceeds();
error NotOwner();
error NotApprovedForMarketplace();
error PriceMustBeAboveZero();
contract Marketplace is ReentrancyGuard {
enum PriceType {
ETHER,
TOKEN
}
struct Listing {
uint256 price;
address seller;
address nftAddress;
uint256 tokenId;
Payment payment;
}
struct Offer {
uint256 price;
address buyer;
Payment payment;
}
struct Payment {
PriceType priceType;
address tokenAddress;
}
event ItemListed(
address indexed seller,
address indexed nftAddress,
uint256 indexed tokenId,
uint256 price,
Payment payment
);
event ItemCanceled(
address indexed seller,
address indexed nftAddress,
uint256 indexed tokenId,
Payment payment
);
event ItemBought(
address indexed buyer,
address indexed nftAddress,
uint256 indexed tokenId,
uint256 price,
Payment payment
);
event OfferMade(
address indexed buyer,
address indexed nftAddress,
uint256 indexed tokenId,
uint256 price,
Payment payment,
uint256 offerIndex
);
event OfferCanceled(
address indexed buyer,
address indexed nftAddress,
uint256 indexed tokenId,
uint256 price,
Payment payment,
uint256 offerIndex
);
event OfferUpdated(
address indexed buyer,
address indexed nftAddress,
uint256 indexed tokenId,
uint256 newPrice,
Payment payment,
uint256 offerIndex
);
struct OfferWithIndex {
uint256 index;
Offer offer;
}
mapping(address => mapping(uint256 => Listing)) private s_listings;
mapping(address => mapping(uint256 => Offer[])) private s_offers;
address WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2; //update before mainnet
address admin;
uint256 listingCounter;
modifier onlyOwner() {
require(msg.sender == admin, "Only owner can call this function");
_;
}
constructor() {
admin = msg.sender;
}
Listing[] private s_listingsArray;
modifier notListed(address nftAddress, uint256 tokenId, address owner) {
Listing memory listing = s_listings[nftAddress][tokenId];
if (listing.price > 0) {
revert("Already listed");
}
_;
}
modifier isOwner(address nftAddress, uint256 tokenId, address spender) {
IERC721 nft = IERC721(nftAddress);
address owner = nft.ownerOf(tokenId);
if (spender != owner) {
revert("Not owner");
}
_;
}
modifier isListed(address nftAddress, uint256 tokenId) {
Listing memory listing = s_listings[nftAddress][tokenId];
if (listing.price <= 0) {
revert("Not listed");
}
_;
}
function isApprovedForMarketplace(
address nftAddress,
uint256 tokenId) internal view returns(bool) {
IERC721 nft = IERC721(nftAddress);
address approved = nft.getApproved(tokenId);
return approved == address(this) || nft.isApprovedForAll(msg.sender, address(this));
}
function listItem(
address nftAddress,
uint256 tokenId,
uint256 price,
Payment memory payment
) external notListed(nftAddress, tokenId, msg.sender) isOwner(nftAddress, tokenId, msg.sender) {
require(price > 0, "Price must be above zero");
require(isApprovedForMarketplace(nftAddress, tokenId), "Not approved for marketplace");
{
s_listings[nftAddress][tokenId] = Listing(price, msg.sender, nftAddress, tokenId, payment);
s_listingsArray.push(Listing(price, msg.sender, nftAddress, tokenId, payment));
}
listingCounter++;
emit ItemListed(msg.sender, nftAddress, tokenId, price, payment);
}
function cancelListing(
address nftAddress,
uint256 tokenId,
Payment memory payment
) external nonReentrant {
Listing storage listing = s_listings[nftAddress][tokenId];
require(listing.seller == msg.sender, "Not the seller");
listingCounter--;
delete s_listings[nftAddress][tokenId];
uint256 listingIndex;
uint256 length = s_listingsArray.length;
for (uint256 i = 0; i < length; i++) {
if (s_listingsArray[i].nftAddress == nftAddress && s_listingsArray[i].tokenId == tokenId) {
listingIndex = i;
break;
}
}
if (listingIndex != 0) {
s_listingsArray[listingIndex] = s_listingsArray[length - 1];
s_listingsArray.pop();
emit ItemCanceled(msg.sender, nftAddress, tokenId, payment);
}
}
function buyItem(
address nftAddress,
uint256 tokenId,
Payment memory payment
) external payable nonReentrant {
Listing memory listing = s_listings[nftAddress][tokenId];
require(listing.price > 0, "Item not listed");
IERC721 nft = IERC721(nftAddress);
require(nft.ownerOf(tokenId) == listing.seller, "Seller no longer owner");
require(listing.payment.priceType == PriceType.ETHER || listing.payment.priceType == PriceType.TOKEN, "Invalid payment type");
if (listing.payment.priceType == PriceType.ETHER) {
require(msg.value >= listing.price, "Insufficient payment");
nft.safeTransferFrom(listing.seller, msg.sender, tokenId);
(bool success, ) = payable(listing.seller).call{ value: listing.price } ("");
require(success, "Payment failed");
} else {
IERC20 token = IERC20(listing.payment.tokenAddress);
require(token.allowance(msg.sender, address(this)) >= listing.price, "Token allowance not enough");
require(token.transferFrom(msg.sender, listing.seller, listing.price), "Transfer failed");
nft.safeTransferFrom(listing.seller, msg.sender, tokenId);
}
delete s_listings[nftAddress][tokenId];
for (uint i = 0; i < s_listingsArray.length; i++) {
if (s_listingsArray[i].nftAddress == nftAddress && s_listingsArray[i].tokenId == tokenId) {
delete s_listingsArray[i];
listingCounter--;
break;
}
}
emit ItemBought(msg.sender, nftAddress, tokenId, listing.price, payment);
}
function makeOffer(
address nftAddress,
uint256 tokenId,
uint256 price,
Payment memory payment
) external nonReentrant {
IERC721 nft = IERC721(nftAddress);
require(nft.ownerOf(tokenId) != msg.sender, "Cannot make an offer on your own item");
if (payment.priceType == PriceType.ETHER) {
IERC20 token = IERC20(WETH);
require(token.allowance(msg.sender, address(this)) >= price, "Token allowance not enough");
} else {
IERC20 token = IERC20(payment.tokenAddress);
require(token.allowance(msg.sender, address(this)) >= price, "Token allowance not enough");
}
Offer memory offer = Offer(price, msg.sender, payment);
Offer[] storage offers = s_offers[nftAddress][tokenId];
uint256 offerIndex = getInactiveOfferIndex(offers);
if (offerIndex == offers.length) {
offers.push(offer);
} else {
offers[offerIndex] = offer;
}
emit OfferMade(msg.sender, nftAddress, tokenId, price, payment, offerIndex);
}
function acceptOffer(
address nftAddress,
uint256 tokenId,
uint256 offerIndex
) external nonReentrant {
Listing storage listing = s_listings[nftAddress][tokenId];
Offer[] storage offers = s_offers[nftAddress][tokenId];
IERC721 nft = IERC721(nftAddress);
require(nft.ownerOf(tokenId) == msg.sender, "Not the owner of the NFT");
require(offerIndex < offers.length, "Invalid offer index");
Offer memory offer = offers[offerIndex];
require(offer.buyer != address(0), "Offer does not exist");
IERC20 token = IERC20(offer.payment.tokenAddress);
require(token.allowance(offer.buyer, address(this)) >= offer.price, "Token allowance not enough");
require(token.transferFrom(offer.buyer, msg.sender, offer.price), "Transfer failed");
nft.safeTransferFrom(nft.ownerOf(tokenId), offer.buyer, tokenId);
if (listing.price > 0) {
delete s_listings[nftAddress][tokenId];
listingCounter--;
for (uint256 i = 0; i < s_listingsArray.length; i++) {
if (s_listingsArray[i].nftAddress == nftAddress && s_listingsArray[i].tokenId == tokenId) {
s_listingsArray[i] = s_listingsArray[s_listingsArray.length - 1];
s_listingsArray.pop();
break;
}
}
}
delete offers[offerIndex];
emit ItemBought(offer.buyer, nftAddress, tokenId, offer.price, offer.payment);
}
function updateOffer(
address nftAddress,
uint256 tokenId,
uint256 offerIndex,
uint256 newPrice,
Payment memory newPayment
) external nonReentrant {
Offer[] storage offers = s_offers[nftAddress][tokenId];
require(offerIndex < offers.length, "Invalid offer index");
Offer storage offer = offers[offerIndex];
require(offer.buyer == msg.sender, "Not the offer maker");
offer.price = newPrice;
offer.payment = newPayment;
emit OfferUpdated(
offer.buyer,
nftAddress,
tokenId,
newPrice,
newPayment,
offerIndex
);
}
function getInactiveOfferIndex(
Offer[] storage offers
) internal view returns (uint256) {
for (uint256 i = 0; i < offers.length; i++) {
if (offers[i].buyer == address(0)) {
return i;
}
}
return offers.length;
}
function updateListing(
address nftAddress,
uint256 tokenId,
uint256 newPrice,
Payment memory payment
)
external
isListed(nftAddress, tokenId)
nonReentrant
isOwner(nftAddress, tokenId, msg.sender)
{
if (newPrice == 0) {
revert("Price must be above zero");
}
s_listings[nftAddress][tokenId].price = newPrice;
emit ItemListed(msg.sender, nftAddress, tokenId, newPrice, payment);
}
function cancelAnyListing(
address nftAddress,
uint256 tokenId
) external onlyOwner {
Listing storage listing = s_listings[nftAddress][tokenId];
require(listing.price > 0, "Listing does not exist");
listingCounter--;
delete s_listings[nftAddress][tokenId];
uint256 listingIndex;
uint256 length = s_listingsArray.length;
for (uint256 i = 0; i < length; i++) {
if (s_listingsArray[i].nftAddress == nftAddress && s_listingsArray[i].tokenId == tokenId) {
listingIndex = i;
break;
}
}
if (listingIndex != 0) {
s_listingsArray[listingIndex] = s_listingsArray[length - 1];
s_listingsArray.pop();
}
emit ItemCanceled(admin, nftAddress, tokenId, listing.payment);
}
function getActiveOffers(
address nftAddress,
uint256 tokenId
) external view returns (OfferWithIndex[] memory) {
Offer[] storage offers = s_offers[nftAddress][tokenId];
uint256 activeCount = getActiveOfferCount(offers);
OfferWithIndex[] memory activeOffers = new OfferWithIndex[](activeCount);
uint256 currentIndex = 0;
for (uint256 i = 0; i < offers.length; i++) {
if (offers[i].buyer != address(0)) {
activeOffers[currentIndex].index = i;
activeOffers[currentIndex].offer = offers[i];
currentIndex++;
}
}
return activeOffers;
}
function getActiveOfferCount(
Offer[] storage offers
) internal view returns (uint256) {
uint256 count = 0;
for (uint256 i = 0; i < offers.length; i++) {
if (offers[i].buyer != address(0)) {
count++;
}
}
return count;
}
function cancelOffer(
address nftAddress,
uint256 tokenId,
uint256 offerIndex
) external nonReentrant {
Offer[] storage offers = s_offers[nftAddress][tokenId];
require(offerIndex < offers.length, "Invalid offer index");
Offer memory offer = offers[offerIndex];
require(offer.buyer == msg.sender, "Not the offer maker");
delete offers[offerIndex];
emit OfferCanceled(
offer.buyer,
nftAddress,
tokenId,
offer.price,
offer.payment,
offerIndex
);
}
}
Read Contract
getActiveOffers 0xedac9616 → tuple[]
Write Contract 9 functions
These functions modify contract state and require a wallet transaction to execute.
acceptOffer 0x3c6fc817
address nftAddress
uint256 tokenId
uint256 offerIndex
buyItem 0xbf01c2bc
address nftAddress
uint256 tokenId
tuple payment
cancelAnyListing 0x64db0eec
address nftAddress
uint256 tokenId
cancelListing 0x5d5097bf
address nftAddress
uint256 tokenId
tuple payment
cancelOffer 0x0e030d6a
address nftAddress
uint256 tokenId
uint256 offerIndex
listItem 0xe33f6240
address nftAddress
uint256 tokenId
uint256 price
tuple payment
makeOffer 0xe78d9bdd
address nftAddress
uint256 tokenId
uint256 price
tuple payment
updateListing 0xb8e27cba
address nftAddress
uint256 tokenId
uint256 newPrice
tuple payment
updateOffer 0x2e06633c
address nftAddress
uint256 tokenId
uint256 offerIndex
uint256 newPrice
tuple newPayment
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