IERC 721

Required interface of an ERC721 compliant contract.

Methods

approve

function approve(address to, uint256 tokenId) external nonpayable

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.

Parameters

Name	Type	Description
to	address	undefined
tokenId	uint256	undefined

balanceOf

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

Returns the number of tokens in owner's account.

Parameters

Name	Type	Description
owner	address	undefined

Returns

Name	Type	Description
balance	uint256	undefined

getApproved

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

Returns the account approved for tokenId token. Requirements: - tokenId must exist.

Parameters

Name	Type	Description
tokenId	uint256	undefined

Returns

Name	Type	Description
operator	address	undefined

isApprovedForAll

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

Returns if the operator is allowed to manage all of the assets of owner. See {setApprovalForAll}

Parameters

Name	Type	Description
owner	address	undefined
operator	address	undefined

Returns

Name	Type	Description
_0	bool	undefined

ownerOf

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

Returns the owner of the tokenId token. Requirements: - tokenId must exist.

Parameters

Name	Type	Description
tokenId	uint256	undefined

Returns

Name	Type	Description
owner	address	undefined

safeTransferFrom

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

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 be 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.

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

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.

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

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.

Parameters

Name	Type	Description
operator	address	undefined
_approved	bool	undefined

supportsInterface

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

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.

Parameters

Name	Type	Description
interfaceId	bytes4	undefined

Returns

Name	Type	Description
_0	bool	undefined

transferFrom

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

Transfers tokenId token from from to to. WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible. 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.

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)

Emitted when owner enables approved to manage the tokenId token.

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)

Emitted when owner enables or disables (approved) operator to manage all of its assets.

Parameters

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

Transfer

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

Emitted when tokenId token is transferred from from to to.

Parameters

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