# Pair

```typescript
constructor(tokenAmountA: TokenAmount, tokenAmountB: TokenAmount)
```

The Pair entity represents a Uniswap pair with a balance of each of its pair tokens.

## Example

```typescript
import { ChainId, Token, TokenAmount, Pair } from '@uniswap/sdk'

const HOT = new Token(ChainId.MAINNET, '0xc0FFee0000000000000000000000000000000000', 18, 'HOT', 'Caffeine')
const NOT = new Token(ChainId.MAINNET, '0xDeCAf00000000000000000000000000000000000', 18, 'NOT', 'Caffeine')

const pair = new Pair(new TokenAmount(HOT, '2000000000000000000'), new TokenAmount(NOT, '1000000000000000000'))
```

## Static Methods

### getAddress

```typescript
getAddress(tokenA: Token, tokenB: Token): string
```

Computes the pair address for the passed Tokens. See Pair Addresses.

## Properties

### liquidityToken

```typescript
liquidityToken: Token
```

A Token representing the liquidity token for the pair. See Pair (ERC-20).

### token0

```typescript
token0: Token
```

See .

### token1

```typescript
token1: Token
```

See .

### reserve0

```typescript
reserve0: TokenAmount
```

The reserve of token0.

### reserve1

```typescript
reserve1: TokenAmount
```

The reserve of token1.

## Methods

### reserveOf

```typescript
reserveOf(token: Token): TokenAmount
```

Returns reserve0 or reserve1, depending on whether token0 or token1 is passed in.

### getOutputAmount

```typescript
getOutputAmount(inputAmount: TokenAmount): [TokenAmount, Pair]
```

Pricing function for exact input amounts. Returns maximum output amount based on current reserves and the new Pair that would exist if the trade were executed.

### getInputAmount

```typescript
getInputAmount(outputAmount: TokenAmount): [TokenAmount, Pair]
```

Pricing function for exact output amounts. Returns minimum input amount based on current reserves and the new Pair that would exist if the trade were executed.

### getLiquidityMinted

```typescript
getLiquidityMinted(totalSupply: TokenAmount, tokenAmountA: TokenAmount, tokenAmountB: TokenAmount): TokenAmount
```

Calculates the exact amount of liquidity tokens minted from a given amount of token0 and token1.

* totalSupply must be looked up on-chain.
* The value returned from this function *cannot* be used as an input to getLiquidityValue.

### getLiquidityValue

```typescript
getLiquidityValue(
  token: Token,
  totalSupply: TokenAmount,
  liquidity: TokenAmount,
  feeOn: boolean = false,
  kLast?: BigintIsh
): TokenAmount
```

Calculates the exact amount of token0 or token1 that the given amount of liquidity tokens represent.

* totalSupply must be looked up on-chain.
* If the protocol charge is on, feeOn must be set to true, and kLast must be provided from an on-chain lookup.
* Values returned from this function *cannot* be used as inputs to getLiquidityMinted.


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