# ExchangeOrdersHolderV1
[Git Source](https://github.com/buildship-dev/nft-contracts/blob/fd1c33a9dbefe42158dfc60d10c0afde05c713aa/contracts/utils/Rarible/ExchangeV1.sol)


## State Variables
### orders

```solidity
mapping(bytes32 => OrderParams) internal orders;
```


## Functions
### add


```solidity
function add(ExchangeDomainV1.Order calldata order) external;
```

### exists


```solidity
function exists(ExchangeDomainV1.Order calldata order) external view returns (bool);
```

### prepareKey


```solidity
function prepareKey(ExchangeDomainV1.Order memory order) internal pure returns (bytes32);
```

## Structs
### OrderParams

```solidity
struct OrderParams {
    uint256 selling;
    uint256 buying;
    uint256 sellerFee;
}
```