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StrategyChainlinkUSDDynamicAsk

This contract allows a seller to sell an NFT priced in USD and the receivable amount to be in ETH.

ETH_USD_PRICE_FEED_DECIMALS

uint256 ETH_USD_PRICE_FEED_DECIMALS

It is possible to call priceFeed.decimals() to get the decimals, but to save gas, it is hard coded instead.

WETH

address WETH

Wrapped ether (WETH) address.

priceFeed

contract AggregatorV3Interface priceFeed

ETH/USD Chainlink price feed

constructor

constructor(address _owner, address _weth, address _priceFeed) public

Constructor

Parameters

NameTypeDescription
_owneraddressOwner address
_wethaddressWrapped ether address
_priceFeedaddressAddress of the ETH/USD price feed

executeStrategyWithTakerBid

function executeStrategyWithTakerBid(struct OrderStructs.Taker takerBid, struct OrderStructs.Maker makerAsk) external view returns (uint256 price, uint256[] itemIds, uint256[] amounts, bool isNonceInvalidated)

This function validates the order under the context of the chosen strategy and returns the fulfillable items/amounts/price/nonce invalidation status. This strategy looks at the seller's desired sale price in USD and minimum sale price in ETH, converts the USD value into ETH using Chainlink's price feed and chooses the higher price.

The client has to provide the seller's desired sale price in USD as the additionalParameters

Parameters

NameTypeDescription
takerBidstruct OrderStructs.TakerTaker bid struct (taker bid-specific parameters for the execution)
makerAskstruct OrderStructs.MakerMaker ask struct (maker ask-specific parameters for the execution)

isMakerOrderValid

function isMakerOrderValid(struct OrderStructs.Maker makerAsk, bytes4 functionSelector) external view returns (bool isValid, bytes4 errorSelector)

Validate only the maker order under the context of the chosen strategy. It does not revert if the maker order is invalid. Instead it returns false and the error's 4 bytes selector.

Parameters

NameTypeDescription
makerAskstruct OrderStructs.Maker
functionSelectorbytes4Function selector for the strategy

Return Values

NameTypeDescription
isValidboolWhether the maker struct is valid
errorSelectorbytes4If isValid is false, it returns the error's 4 bytes selector