> ## Documentation Index
> Fetch the complete documentation index at: https://docs.qu.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# FewestCoinSelector

The FewestCoinSelector class provides a coin selection algorithm that selects the fewest UTXOs required to meet the
target amount. This algorithm is useful for minimizing the size of the transaction and the fees associated with it.

This class is a sub-class of AbstractCoinSelector | **AbstractCoinSelector** and implements the
AbstractCoinSelector.performSelection | **performSelection** method to provide the actual coin selection
logic.

## Extends

* `AbstractCoinSelector`

## Constructors

### new FewestCoinSelector()

```ts theme={null}
new FewestCoinSelector(availableUTXOs): FewestCoinSelector
```

Constructs a new AbstractCoinSelector instance with an empty UTXO array.

#### Parameters

| Parameter        | Type                                   | Default value |
| :--------------- | :------------------------------------- | :------------ |
| `availableUTXOs` | [`UTXO`](/sdk/content/classes/UTXO)\[] | `[]`          |

#### Returns

[`FewestCoinSelector`](/sdk/content/classes/FewestCoinSelector)

#### Inherited from

`AbstractCoinSelector.constructor`

#### Source

[transaction/abstract-coinselector.ts:61](https://github.com/dominant-strategies/quais.js/blob/c1c12d43f9d34c6baad2b0542bd6d0acd6fefcbf/src/transaction/abstract-coinselector.ts#L61)

## Methods

### decreaseFee()

```ts theme={null}
decreaseFee(feeReduction): SelectedCoinsResult
```

Decreases the fee by removing inputs if possible and adjusting change outputs.

#### Parameters

| Parameter      | Type     | Description                                |
| :------------- | :------- | :----------------------------------------- |
| `feeReduction` | `bigint` | The amount by which the fee has decreased. |

#### Returns

`SelectedCoinsResult`

#### Source

[transaction/coinselector-fewest.ts:280](https://github.com/dominant-strategies/quais.js/blob/c1c12d43f9d34c6baad2b0542bd6d0acd6fefcbf/src/transaction/coinselector-fewest.ts#L280)

***

### increaseFee()

```ts theme={null}
increaseFee(additionalFeeNeeded): SelectedCoinsResult
```

Increases the total fee by first reducing change outputs, then selecting additional inputs if necessary.

#### Parameters

| Parameter             | Type     | Description                |
| :-------------------- | :------- | :------------------------- |
| `additionalFeeNeeded` | `bigint` | The additional fee needed. |

#### Returns

`SelectedCoinsResult`

Returns true if successful, false if insufficient funds.

#### Source

[transaction/coinselector-fewest.ts:226](https://github.com/dominant-strategies/quais.js/blob/c1c12d43f9d34c6baad2b0542bd6d0acd6fefcbf/src/transaction/coinselector-fewest.ts#L226)

***

### performSelection()

```ts theme={null}
performSelection(config): SelectedCoinsResult
```

Performs coin selection to meet the target amount plus fee, using the smallest possible denominations and
minimizing the number of inputs and outputs.

#### Parameters

| Parameter | Type                  |
| :-------- | :-------------------- |
| `config`  | `CoinSelectionConfig` |

#### Returns

`SelectedCoinsResult`

The selected UTXOs and outputs.

#### Overrides

`AbstractCoinSelector.performSelection`

#### Source

[transaction/coinselector-fewest.ts:24](https://github.com/dominant-strategies/quais.js/blob/c1c12d43f9d34c6baad2b0542bd6d0acd6fefcbf/src/transaction/coinselector-fewest.ts#L24)