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Fee Distribution
Contracts and wallets can be excluded from fees through the VaultFactoryUpgradable contract. The owner of the contract can add an address, along with a boolean representation of their exclusion from paying fees, to the setFeeExclusion function. This will emit a FeeExclusion event and update an internal mapping. This can then be queried by other contracts by performing a call along the lines of nftxVaultFactory.excludedFromFees(msg.sender).
Fees are charged and distributed when an NFT is minted, redeemed or swapped in an NFTX vault. If a user is excluded from fees in this manner then no fees will be send to the feeDistributor and no tokens will be transferred via the NFTX Vault contract.
This is used for NFTX zaps to allow for additional transactions to take place before, or instead of, incurring fees.
If fees are not excluded then:
  • The amount of fee owed is determined by checking the vault fees that are assigned by it’s creator
  • The fee is then transferred to the fee distributor contract attached to the vault
    • This distributor is required during initialisation and its implementation is validated.
    • At this point the fee amount is also sense checked
  • The distributor contract then calls the distribute function, along with the corresponding vaultId that is calling it
  • Distribution logic will vary depending on the contract that is implemented. The different distribution contracts should have ample documentation and commenting to understand.

bool distributionPaused
Flags if distribution is currently paused

address nftxVaultFactory
Contract address of the NFTX Vault Factory contract.

address lpStaking
Contract address of the LP Staking contract.

address treasury
Contract address of the NFTX Treasury contract.

uint256 allocTotal
Total allocation points per vault.

struct INFTXSimpleFeeDistributor.FeeReceiver[] feeReceivers
Array storage of fee receivers, accessed by index.

address inventoryStaking
Contract address of the NFTX Inventory Staking contract.

event UpdateTreasuryAddress(address newTreasury)
Emitted when the treasury address is updated.
Name
Type
Description
newTreasury
address
The new address for the treasury contract

event UpdateLPStakingAddress(address newLPStaking)
Emitted when the LP Staking address is updated.
Name
Type
Description
newLPStaking
address
The new address for the LP Staking contract

event UpdateInventoryStakingAddress(address newInventoryStaking)
Emitted when the Inventory Staking address is updated.
Name
Type
Description
newInventoryStaking
address
The new address for the Inventory Staking contract

event UpdateNFTXVaultFactory(address factory)
Emitted when the NFTX Vault Factory address is updated.
Name
Type
Description
factory
address
The new address for the NFTX Vault Factory contract

event PauseDistribution(bool paused)
Emitted when this contract is paused or unpaused.
Name
Type
Description
paused
bool
Boolean value of if distribution has been paused (true) or unpaused (false)

event AddFeeReceiver(address receiver, uint256 allocPoint)
Emitted when a contract or non-contract receiver is added as a FeeReceiver.
Name
Type
Description
receiver
address
The address of the new fee recipient
allocPoint
uint256
The number of allocation points assigned to the receiver

event UpdateFeeReceiverAlloc(address receiver, uint256 allocPoint)
Emitted when a receiver's allocation is updated.
Name
Type
Description
receiver
address
The address of the updated fee recipient
allocPoint
uint256
The new number of allocation points assigned to the receiver

event UpdateFeeReceiverAddress(address oldReceiver, address newReceiver)
Emitted when a receiver's address is updated.
Name
Type
Description
oldReceiver
address
The old address of the receiver
newReceiver
address
The new address of the receiver

event RemoveFeeReceiver(address receiver)
Emitted when a receiver's address is removed.
Name
Type
Description
receiver
address
The address of the receiver that was removed

function __SimpleFeeDistributor__init__(address _lpStaking, address _treasury) public
Initialiser for the fee distributor, setting relevant staking and treasury addresses.
Allows for upgradable deployment
Name
Type
Description
_lpStaking
address
Address of our LP Staking contract
_treasury
address
Address of our Treasury contract

function distribute(uint256 vaultId) external virtual
Distributes fees to receivers. All receivers will be iterated over to distribute their relative allocation of the total number of tokens.
The total balance of the token on the contract will be distributed.
Any dust balance remaining on the contract is transferred to the treasury.
_If distribution is paused or we have no receivers added (defined by allocTotal) then the entire token balance will be sent to the treasury.
When our receivers are set up by the contract owner they are assigned an allocPoint value that indicates the relative size of the allocation they will be eligible to receive. This is explained in greater depth on the addReceiver method.
The vault ID will determine the ERC20 token that will be transferred._
Name
Type
Description
vaultId
uint256
The vault ID that is to have its fees distributed

function addReceiver(uint256 _allocPoint, address _receiver, bool _isContract) external virtual
Adds a receiver to the fee distributor. If a contract receiver is added, then they must a call to receiveRewards as outlined in the _sendForReceiver function. The receiver is given an allocPoint value that defines their relative stake of the rewards.
_For the point allocation, if receiver A has 1 allocPoint and receiver B has 3 allocPoint then when rewards are distributed they will each receive a percentage based on the relative value.
For example, in this case receiver B would receive 75% of the rewards and receiver A would receive the remaining 25%._
Name
Type
Description
_allocPoint
uint256
The point allocation applied to the receiver
_receiver
address
The address of the receiver
_isContract
bool
Flag to determine if the receiver is a contract, rather than a wallet address

function initializeVaultReceivers(uint256 _vaultId) external
Allows the NFTX Vault Factory contract caller to add a pool vault for LP Staking and, if an inventory staking address is set, then deploys an xToken for the vault.
Name
Type
Description
_vaultId
uint256
The NFTX vault ID

function changeReceiverAlloc(uint256 _receiverIdx, uint256 _allocPoint) public virtual
Allows receiver allocation to be updated.
Safe math is not implemented, so calculations must not exceed uint256 boundaries for allocTotal.
Name
Type
Description
_receiverIdx
uint256
The index value of the feeReceiver in our internally stored array
_allocPoint
uint256
The new allocation for the receiver

function changeReceiverAddress(uint256 _receiverIdx, address _address, bool _isContract) public virtual
Allows receiver address and isContract state to be updated.
Name
Type
Description
_receiverIdx
uint256
The index value of the feeReceiver in our internally stored array
_address
address
The new address for the receiver
_isContract
bool
The new isContract boolean flag for the receiver

function removeReceiver(uint256 _receiverIdx) external virtual
Removes the receiver from our internal array so that they will no longer be included in our fee distribution.
This removal changes the index order of the feeReceivers array by moving the last element to that of the removed value. External sources will need to reflect this change for future updates before making subsequent calls.
Name
Type
Description
_receiverIdx
uint256
The index value of the feeReceiver in our internally stored array

function setTreasuryAddress(address _treasury) public
Allows our treasury address to be updated.
Name
Type
Description
_treasury
address
Address of our new Treasury contract

function setLPStakingAddress(address _lpStaking) public
Allows our LP Staking address to be updated.
Name
Type
Description
_lpStaking
address
Address of our new LP Staking contract

function setInventoryStakingAddress(address _inventoryStaking) public
Allows our Inventory Staking address to be updated.
Name
Type
Description
_inventoryStaking
address
Address of our new Inventory Staking contract

function setNFTXVaultFactory(address _factory) external
Allows our NFTX Vault Factory address to be updated.
Name
Type
Description
_factory
address
Address of our new NFTX Vault Factory contract

function pauseFeeDistribution(bool _pause) external
Allows our fee distribution system to be paused or unpaused.
Name
Type
Description
_pause
bool
A boolean representation of if the distribution should be paused

function rescueTokens(address _address) external
Allows tokens to be rescued from the contract to the sender. This will transfer the entire balance of the matching ERC20 token.
Name
Type
Description
_address
address
The address of the token to be rescued

function _addReceiver(uint256 _allocPoint, address _receiver, bool _isContract) internal virtual
Adds a FeeReceiver to our internally stored fee receivers array.
The new receiver will always be added to the end of the array.
Name
Type
Description
_allocPoint
uint256
The new allocation for the receiver
_receiver
address
The address of the receiver
_isContract
bool
Flag to determine if the receiver is a contract, rather than a wallet address

function _sendForReceiver(struct INFTXSimpleFeeDistributor.FeeReceiver _receiver, uint256 _vaultId, address _vault, uint256 amountToSend) internal virtual returns (bool)
Sends the specified amount of tokens to a receiver from an NFTX vault.
If the receiver is a contract then they must implement receiveRewards to handle the fee distribution.
Name
Type
Description
_receiver
struct INFTXSimpleFeeDistributor.FeeReceiver
Address of the receiver contract or wallet
_vaultId
uint256
The ID of the NFTX vault, provided to the external contract
_vault
address
The address of the NFTX vault
amountToSend
uint256
The amount of tokens distributed to the receiver
Name
Type
Description
[0]
bool
bool If the tokens were successfully transferred and there are no more tokens left to transfer
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