CrystalDataHelper

The data helper contract is used to help the front-end query necessary information.

balanceOf

function balanceOf(address account, address token) public view returns (uint256)

Retrieves the balance of a token for an address. If the token address is 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, the native token balance will be returned. If not, the ERC-20 token balance of the specified token is returned.

Parameters

Name	Type	Description
account	address	Address to query token balance of
token	address	Token address

Return Values

Name	Type	Description
balance	uint256	The addresses' balance of the specified token.

getPrice

function getPrice(address market) public view returns (uint256 price, uint256 _highestBid, uint256 _lowestAsk)

Fetches the current mid price of a market, as well as the highest bid and lowest ask.

Parameters

Name	Type	Description
market	address	Market address

Return Values

Name	Type	Description
price	uint256	The mid price
_highestBid	uint256	The price of the highest buy order
_lowestAsk	uint256	The price of the lowest sell order

batchBalanceOf

function batchBalanceOf(address account, address[] calldata tokens) external view returns (uint256[] memory returnData)

Retrieves the balances of multiple tokens for an address.

Parameters

Name	Type	Description
account	address	Address to query token balance of
tokens	address[] calldata	Array of token addresses

Return Values

Name	Type	Description
returnData	uint256[] memory	List consisting of the addresses' balance of each token.

getPrices

function getPrices(address[] calldata markets) external view returns (uint256[] memory mids, uint256[] memory highestBids, uint256[] memory lowestAsks)

Fetches the current mid price, highest bid, and lowest ask of multiple markets.

Parameters

Name	Type	Description
markets	address[] calldata	List of market addresses

Return Values

Name	Type	Description
mids	uint256[] memory	Mid prices
highestBids	uint256[] memory	Prices of the highest buy order
lowestAsks	uint256[] memory	Prices of the lowest sell order

getOrderSizes

function getOrderSizes(uint256[] calldata orderData, address[] calldata markets) external view returns (uint256[] memory sizes)

Batch queries individual order sizes from markets.

Parameters

Name	Type	Description
orderData	uint256[] calldata	The first 16 bytes represent the order price while the last 16 bytes represent the order id
markets	address[] calldata	List of market addresses

Return Values

Name	Type	Description
sizes	uint256[] memory	List consisting of the size of each order