Downpayment

This is the entrance contract for down payment

Methods

buy​

function buy(address adapter,uint256 borrowAmount,bytes calldata data,Sig calldata sig) external payable;

Buy nft from the marketplace with downpayment

Parameters​

Name	Type	Description
adapter	address	address of the marketplace adapter
borrowAmount	uint256	amount of borrowed from lending pool (max borrowable amount: lendPool.getNftCollateralData.availableBorrowsInReserve)
data	bytes	encoded order data for the marketplace, each markeplace have different order type: x2y2, seaport, looksrare, bend
sig	IDownpayment.Sig	signature of the order with nonce, can be verified by eip712 and eip1271

addAdapter

function addAdapter(address adapter) external nonpayable

add new adapter

Parameters

Name	Type	Description
adapter	address	address of the marketplace adapter

removeAdapter

function removeAdapter(address adapter) external nonpayable

remove adapter

Parameters

Name	Type	Description
adapter	address	address of the marketplace adapter

renounceOwnership​

function renounceOwnership() external nonpayable

Leaves the contract without owner. It will not be possible to call onlyOwner functions anymore. Can only be called by the current owner. NOTE: Renouncing ownership will leave the contract without an owner, thereby removing any functionality that is only available to the owner.

transferOwnership​

function transferOwnership(address newOwner) external nonpayable

Transfers ownership of the contract to a new account (newOwner). Can only be called by the current owner.

Parameters​

Name	Type	Description
newOwner	address	address of the new owner

View methods

WETH

function WETH() external view returns (address)

Returns

Name	Type	Description
WETH	address	address of the WETH ("Wrapped Ether") contract

getFee

function getFee(address adapter) external view returns (uint256)

Parameters

Name	Type	Description
adapter	address	address of the marketplace adapter

Returns

Name	Type	Description
fee	uint256	protocol fee (e.g., 200 = 2%)

getFeeCollector

function getFeeCollector() external view returns (address)

Returns

feeCollector	address	address of fee collector

getBendLendPool

function getBendLendPool() external view returns (ILendPool)

Returns

Name	Type	Description
bendLendPool	contract ILendPool	address of bend lend pool

getAaveLendPool

function getAaveLendPool() external view returns (IAaveLendPool)

Returns

Name	Type	Description
aaveLendPool	contract IAaveLendPool	address of aave lend pool

nonces

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

Parameters

Name	Type	Description
owner	address	address of the owner

Returns

Name	Type	Description
nonce	uint256	next nonce of owner

isAdapterWhitelisted​

function isAdapterWhitelisted(address adapter) external view returns (bool)

Returns if a adapter is in the system

Parameters​

Name	Type	Description
adapter	address	address of the adapter

Returns​

Name	Type	Description
-	bool	whether adapter is whitelisted

owner​

function owner() external view returns (address)

Returns the address of the current owner.

Returns​

Name	Type	Description
owner	address	address of the current owner

viewCountWhitelistedAdapters​

function viewCountWhitelistedAdapters() external view returns (uint256)

View number of whitelisted adapters

Returns​

Name	Type	Description
-	uint256	number of adapters valid on the downpayment

viewWhitelistedAdapters

function viewWhitelistedAdapters(uint256 cursor, uint256 size) external view returns (address[], uint256)

See whitelisted adapters in the system

Parameters​

Name	Type	Description
cursor	uint256	cursor (should start at 0 for first request)
size	uint256	size of the response (e.g., 50)

Returns​

Name	Type	Description
-	address[]	array of adapter addresses
cursor	uint256	cursor position