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

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