> For the complete documentation index, see [llms.txt](https://docs.mangrove.exchange/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mangrove.exchange/dev/strat-lib/technical-references/api-preferences/strats/src/strategies/offer_maker/market_making/kandel/abstract/tradesbasequotepair.md).

# TradesBaseQuotePair

### OfferType

```solidity
enum OfferType {
  Bid,
  Ask
}
```

### IHasOfferListOfOfferType

#### offerListOfOfferType

```solidity
function offerListOfOfferType(enum OfferType ba) internal view virtual returns (struct OLKey olKey)
```

turns an offer type into an (outbound\_tkn, inbound\_tkn, tickSpacing) pair identifying an offer list.

**Parameters**

| Name | Type           | Description                                                                 |
| ---- | -------------- | --------------------------------------------------------------------------- |
| ba   | enum OfferType | whether one wishes to access the offer lists where asks or bids are posted. |

**Return Values**

| Name  | Type         | Description                       |
| ----- | ------------ | --------------------------------- |
| olKey | struct OLKey | the olKey defining the token pair |

#### offerTypeOfOutbound

```solidity
function offerTypeOfOutbound(contract IERC20 outbound_tkn) internal view virtual returns (enum OfferType ba)
```

returns the offer type of the offer list whose outbound token is given in the argument.

**Parameters**

| Name          | Type            | Description        |
| ------------- | --------------- | ------------------ |
| outbound\_tkn | contract IERC20 | the outbound token |

**Return Values**

| Name | Type           | Description    |
| ---- | -------------- | -------------- |
| ba   | enum OfferType | the offer type |

#### outboundOfOfferType

```solidity
function outboundOfOfferType(enum OfferType ba) internal view virtual returns (contract IERC20 token)
```

returns the outbound token for the offer type

**Parameters**

| Name | Type           | Description    |
| ---- | -------------- | -------------- |
| ba   | enum OfferType | the offer type |

**Return Values**

| Name  | Type            | Description        |
| ----- | --------------- | ------------------ |
| token | contract IERC20 | the outbound token |

### TradesBaseQuotePair

*Implements the IHasOfferListOfOfferType interface contract.*

#### BASE

```solidity
contract IERC20 BASE
```

base of the market Kandel is making

#### QUOTE

```solidity
contract IERC20 QUOTE
```

quote of the market Kandel is making

#### TICK\_SPACING

```solidity
uint256 TICK_SPACING
```

tickSpacing of the market Kandel is making

#### OfferListKey

```solidity
event OfferListKey(bytes32 olKeyHash)
```

The traded offer list\
we only emit this, so that the events for a Kandel is self contained. If one uses the KandelSeeder to deploy, then this information is already available from NewKandel or NewAaveKandel events.

**Parameters**

| Name      | Type    | Description                    |
| --------- | ------- | ------------------------------ |
| olKeyHash | bytes32 | of the market Kandel is making |

#### constructor

```solidity
constructor(struct OLKey olKeyBaseQuote) internal
```

Constructor

**Parameters**

| Name           | Type         | Description                                                                                                                                       |
| -------------- | ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------- |
| olKeyBaseQuote | struct OLKey | The OLKey for the outbound\_tkn base and inbound\_tkn quote offer list Kandel will act on, the flipped OLKey is used for the opposite offer list. |

#### offerListOfOfferType

```solidity
function offerListOfOfferType(enum OfferType ba) internal view returns (struct OLKey olKey)
```

turns an offer type into an (outbound\_tkn, inbound\_tkn, tickSpacing) pair identifying an offer list.

**Parameters**

| Name | Type           | Description                                                                 |
| ---- | -------------- | --------------------------------------------------------------------------- |
| ba   | enum OfferType | whether one wishes to access the offer lists where asks or bids are posted. |

**Return Values**

| Name  | Type         | Description                       |
| ----- | ------------ | --------------------------------- |
| olKey | struct OLKey | the olKey defining the token pair |

#### offerTypeOfOutbound

```solidity
function offerTypeOfOutbound(contract IERC20 outbound_tkn) internal view returns (enum OfferType)
```

returns the offer type of the offer list whose outbound token is given in the argument.

**Parameters**

| Name          | Type            | Description        |
| ------------- | --------------- | ------------------ |
| outbound\_tkn | contract IERC20 | the outbound token |

**Return Values**

| Name | Type           | Description |
| ---- | -------------- | ----------- |
| \[0] | enum OfferType |             |

#### outboundOfOfferType

```solidity
function outboundOfOfferType(enum OfferType ba) internal view returns (contract IERC20 token)
```

returns the outbound token for the offer type

**Parameters**

| Name | Type           | Description    |
| ---- | -------------- | -------------- |
| ba   | enum OfferType | the offer type |

**Return Values**

| Name  | Type            | Description        |
| ----- | --------------- | ------------------ |
| token | contract IERC20 | the outbound token |

#### dual

```solidity
function dual(enum OfferType ba) internal pure returns (enum OfferType baDual)
```

returns the dual offer type

**Parameters**

| Name | Type           | Description                          |
| ---- | -------------- | ------------------------------------ |
| ba   | enum OfferType | whether the offer is an ask or a bid |

**Return Values**

| Name   | Type           | Description                                         |
| ------ | -------------- | --------------------------------------------------- |
| baDual | enum OfferType | is the dual offer type (ask for bid and conversely) |