ERC721Base

The ERC721Base smart contract implements the ERC721 NFT standard, along with the ERC721A optimization to the standard. It includes the following additions to standard ERC721 logic: - Ability to mint NFTs via the provided mint function. - Contract metadata for royalty support on platforms such as OpenSea that use off-chain information to distribute roaylties. - Ownership of the contract, with the ability to restrict certain functions to only be called by the contract's owner. - Multicall capability to perform multiple actions atomically - EIP 2981 compliance for royalty support on NFT marketplaces.

Methods

OPERATOR_FILTER_REGISTRY

function OPERATOR_FILTER_REGISTRY() external view returns (contract IOperatorFilterRegistry)

Returns

Name	Type	Description
_0	contract IOperatorFilterRegistry	undefined

approve

function approve(address operator, uint256 tokenId) external nonpayable

See {ERC721-approve}.

Parameters

Name	Type	Description
operator	address	undefined
tokenId	uint256	undefined

balanceOf

function balanceOf(address owner) external view returns (uint256)

See {IERC721-balanceOf}.

Parameters

Name	Type	Description
owner	address	undefined

Returns

Name	Type	Description
_0	uint256	undefined

batchMintTo

function batchMintTo(address _to, uint256 _quantity, string _baseURI, bytes _data) external nonpayable

Lets an authorized address mint multiple NFTs at once to a recipient.

The logic in the _canMint function determines whether the caller is authorized to mint NFTs.

Parameters

Name	Type	Description
_to	address	The recipient of the NFT to mint.
_quantity	uint256	The number of NFTs to mint.
_baseURI	string	The baseURI for the n number of NFTs minted. The metadata for each NFT is baseURI/tokenId
_data	bytes	Additional data to pass along during the minting of the NFT.

burn

function burn(uint256 _tokenId) external nonpayable

Lets an owner or approved operator burn the NFT of the given tokenId.

ERC721A's _burn(uint256,bool) internally checks for token approvals.

Parameters

Name	Type	Description
_tokenId	uint256	The tokenId of the NFT to burn.

contractURI

function contractURI() external view returns (string)

Returns the contract metadata URI.

Returns

Name	Type	Description
_0	string	undefined

getApproved

function getApproved(uint256 tokenId) external view returns (address)

See {IERC721-getApproved}.

Parameters

Name	Type	Description
tokenId	uint256	undefined

Returns

Name	Type	Description
_0	address	undefined

getBaseURICount

function getBaseURICount() external view returns (uint256)

Returns the count of batches of NFTs.

Each batch of tokens has an in ID and an associated baseURI. See {batchIds}.

Returns

Name	Type	Description
_0	uint256	undefined

getBatchIdAtIndex

function getBatchIdAtIndex(uint256 _index) external view returns (uint256)

Returns the ID for the batch of tokens the given tokenId belongs to.

See {getBaseURICount}.

Parameters

Name	Type	Description
_index	uint256	ID of a token.

Returns

Name	Type	Description
_0	uint256	undefined

getDefaultRoyaltyInfo

function getDefaultRoyaltyInfo() external view returns (address, uint16)

Returns the defualt royalty recipient and BPS for this contract's NFTs.

Returns

Name	Type	Description
_0	address	undefined
_1	uint16	undefined

getRoyaltyInfoForToken

function getRoyaltyInfoForToken(uint256 _tokenId) external view returns (address, uint16)

View royalty info for a given token.

Returns royalty recipient and bps for _tokenId.

Parameters

Name	Type	Description
_tokenId	uint256	The tokenID of the NFT for which to query royalty info.

Returns

Name	Type	Description
_0	address	undefined
_1	uint16	undefined

isApprovedForAll

function isApprovedForAll(address owner, address operator) external view returns (bool)

See {IERC721-isApprovedForAll}.

Parameters

Name	Type	Description
owner	address	undefined
operator	address	undefined

Returns

Name	Type	Description
_0	bool	undefined

isApprovedOrOwner

function isApprovedOrOwner(address _operator, uint256 _tokenId) external view returns (bool isApprovedOrOwnerOf)

Returns whether a given address is the owner, or approved to transfer an NFT.

Parameters

Name	Type	Description
_operator	address	undefined
_tokenId	uint256	undefined

Returns

Name	Type	Description
isApprovedOrOwnerOf	bool	undefined

mintTo

function mintTo(address _to, string _tokenURI) external nonpayable

Lets an authorized address mint an NFT to a recipient.

The logic in the _canMint function determines whether the caller is authorized to mint NFTs.

Parameters

Name	Type	Description
_to	address	The recipient of the NFT to mint.
_tokenURI	string	The full metadata URI for the NFT minted.

multicall

function multicall(bytes[] data) external nonpayable returns (bytes[] results)

Receives and executes a batch of function calls on this contract.

Receives and executes a batch of function calls on this contract.

Parameters

Name	Type	Description
data	bytes[]	The bytes data that makes up the batch of function calls to execute.

Returns

Name	Type	Description
results	bytes[]	The bytes data that makes up the result of the batch of function calls executed.

name

function name() external view returns (string)

See {IERC721Metadata-name}.

Returns

Name	Type	Description
_0	string	undefined

nextTokenIdToMint

function nextTokenIdToMint() external view returns (uint256)

The tokenId assigned to the next new NFT to be minted.

Returns

Name	Type	Description
_0	uint256	undefined

operatorRestriction

function operatorRestriction() external view returns (bool)

Returns

Name	Type	Description
_0	bool	undefined

owner

function owner() external view returns (address)

Returns the owner of the contract.

Returns

Name	Type	Description
_0	address	undefined

ownerOf

function ownerOf(uint256 tokenId) external view returns (address)

See {IERC721-ownerOf}.

Parameters

Name	Type	Description
tokenId	uint256	undefined

Returns

Name	Type	Description
_0	address	undefined

royaltyInfo

function royaltyInfo(uint256 tokenId, uint256 salePrice) external view returns (address receiver, uint256 royaltyAmount)

View royalty info for a given token and sale price.

Returns royalty amount and recipient for tokenId and salePrice.

Parameters

Name	Type	Description
tokenId	uint256	The tokenID of the NFT for which to query royalty info.
salePrice	uint256	Sale price of the token.

Returns

Name	Type	Description
receiver	address	Address of royalty recipient account.
royaltyAmount	uint256	Royalty amount calculated at current royaltyBps value.

safeTransferFrom

function safeTransferFrom(address from, address to, uint256 tokenId) external nonpayable

See {ERC721-_safeTransferFrom}.

Parameters

Name	Type	Description
from	address	undefined
to	address	undefined
tokenId	uint256	undefined

safeTransferFrom

function safeTransferFrom(address from, address to, uint256 tokenId, bytes data) external nonpayable

See {ERC721-_safeTransferFrom}.

Parameters

Name	Type	Description
from	address	undefined
to	address	undefined
tokenId	uint256	undefined
data	bytes	undefined

setApprovalForAll

function setApprovalForAll(address operator, bool approved) external nonpayable

See {ERC721-setApprovalForAll}.

Parameters

Name	Type	Description
operator	address	undefined
approved	bool	undefined

setContractURI

function setContractURI(string _uri) external nonpayable

Lets a contract admin set the URI for contract-level metadata.

Caller should be authorized to setup contractURI, e.g. contract admin. See {_canSetContractURI}. Emits {ContractURIUpdated Event}.

Parameters

Name	Type	Description
_uri	string	keccak256 hash of the role. e.g. keccak256("TRANSFER_ROLE")

setDefaultRoyaltyInfo

function setDefaultRoyaltyInfo(address _royaltyRecipient, uint256 _royaltyBps) external nonpayable

Updates default royalty recipient and bps.

Caller should be authorized to set royalty info. See {_canSetRoyaltyInfo}. Emits {DefaultRoyalty Event}; See {_setupDefaultRoyaltyInfo}.

Parameters

Name	Type	Description
_royaltyRecipient	address	Address to be set as default royalty recipient.
_royaltyBps	uint256	Updated royalty bps.

setOperatorRestriction

function setOperatorRestriction(bool _restriction) external nonpayable

Parameters

Name	Type	Description
_restriction	bool	undefined

setOwner

function setOwner(address _newOwner) external nonpayable

Lets an authorized wallet set a new owner for the contract.

Parameters

Name	Type	Description
_newOwner	address	The address to set as the new owner of the contract.

setRoyaltyInfoForToken

function setRoyaltyInfoForToken(uint256 _tokenId, address _recipient, uint256 _bps) external nonpayable

Updates default royalty recipient and bps for a particular token.

Sets royalty info for _tokenId. Caller should be authorized to set royalty info. See {_canSetRoyaltyInfo}. Emits {RoyaltyForToken Event}; See {_setupRoyaltyInfoForToken}.

Parameters

Name	Type	Description
_tokenId	uint256	undefined
_recipient	address	Address to be set as royalty recipient for given token Id.
_bps	uint256	Updated royalty bps for the token Id.

supportsInterface

function supportsInterface(bytes4 interfaceId) external view returns (bool)

See ERC165: https://eips.ethereum.org/EIPS/eip-165

Parameters

Name	Type	Description
interfaceId	bytes4	undefined

Returns

Name	Type	Description
_0	bool	undefined

symbol

function symbol() external view returns (string)

See {IERC721Metadata-symbol}.

Returns

Name	Type	Description
_0	string	undefined

tokenURI

function tokenURI(uint256 _tokenId) external view returns (string)

Returns the metadata URI for an NFT.

See BatchMintMetadata for handling of metadata in this contract.

Parameters

Name	Type	Description
_tokenId	uint256	The tokenId of an NFT.

Returns

Name	Type	Description
_0	string	undefined

totalSupply

function totalSupply() external view returns (uint256)

Burned tokens are calculated here, use _totalMinted() if you want to count just minted tokens.

Returns

Name	Type	Description
_0	uint256	undefined

transferFrom

function transferFrom(address from, address to, uint256 tokenId) external nonpayable

See {ERC721-_transferFrom}.

Parameters

Name	Type	Description
from	address	undefined
to	address	undefined
tokenId	uint256	undefined

Events

Approval

event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId)

Parameters

Name	Type	Description
owner indexed	address	undefined
approved indexed	address	undefined
tokenId indexed	uint256	undefined

ApprovalForAll

event ApprovalForAll(address indexed owner, address indexed operator, bool approved)

Parameters

Name	Type	Description
owner indexed	address	undefined
operator indexed	address	undefined
approved	bool	undefined

ContractURIUpdated

event ContractURIUpdated(string prevURI, string newURI)

Parameters

Name	Type	Description
prevURI	string	undefined
newURI	string	undefined

DefaultRoyalty

event DefaultRoyalty(address indexed newRoyaltyRecipient, uint256 newRoyaltyBps)

Parameters

Name	Type	Description
newRoyaltyRecipient indexed	address	undefined
newRoyaltyBps	uint256	undefined

OperatorRestriction

event OperatorRestriction(bool restriction)

Parameters

Name	Type	Description
restriction	bool	undefined

OwnerUpdated

event OwnerUpdated(address indexed prevOwner, address indexed newOwner)

Parameters

Name	Type	Description
prevOwner indexed	address	undefined
newOwner indexed	address	undefined

RoyaltyForToken

event RoyaltyForToken(uint256 indexed tokenId, address indexed royaltyRecipient, uint256 royaltyBps)

Parameters

Name	Type	Description
tokenId indexed	uint256	undefined
royaltyRecipient indexed	address	undefined
royaltyBps	uint256	undefined

Transfer

event Transfer(address indexed from, address indexed to, uint256 indexed tokenId)

Parameters

Name	Type	Description
from indexed	address	undefined
to indexed	address	undefined
tokenId indexed	uint256	undefined

Errors

ApprovalCallerNotOwnerNorApproved

error ApprovalCallerNotOwnerNorApproved()

The caller must own the token or be an approved operator.

ApprovalQueryForNonexistentToken

error ApprovalQueryForNonexistentToken()

The token does not exist.

ApprovalToCurrentOwner

error ApprovalToCurrentOwner()

The caller cannot approve to the current owner.

ApproveToCaller

error ApproveToCaller()

The caller cannot approve to their own address.

BalanceQueryForZeroAddress

error BalanceQueryForZeroAddress()

Cannot query the balance for the zero address.

MintToZeroAddress

error MintToZeroAddress()

Cannot mint to the zero address.

MintZeroQuantity

error MintZeroQuantity()

The quantity of tokens minted must be more than zero.

OperatorNotAllowed

error OperatorNotAllowed(address operator)

Parameters

Name	Type	Description
operator	address	undefined

OwnerQueryForNonexistentToken

error OwnerQueryForNonexistentToken()

The token does not exist.

TransferCallerNotOwnerNorApproved

error TransferCallerNotOwnerNorApproved()

The caller must own the token or be an approved operator.

TransferFromIncorrectOwner

error TransferFromIncorrectOwner()

The token must be owned by from.

TransferToNonERC721ReceiverImplementer

error TransferToNonERC721ReceiverImplementer()

Cannot safely transfer to a contract that does not implement the ERC721Receiver interface.

TransferToZeroAddress

error TransferToZeroAddress()

Cannot transfer to the zero address.

URIQueryForNonexistentToken

error URIQueryForNonexistentToken()

The token does not exist.