# Reference: `sushi` Currency

The root currency module contains shared currency abstractions and amount/price primitives.

## Exports

| Export | Purpose |
|---|---|
| `BaseCurrency` | Abstract base class for currencies. |
| `Currency` | Union of native and token currencies. |
| `Token` | Abstract addressable token base class. |
| `Native` | Abstract native asset base class. |
| `Amount` | Raw integer amount of a currency. |
| `Price` | Price ratio between base and quote currencies. |
| `serializedCurrencySchema` | Zod schema factory for serialized currencies. |
| `serializedAmountSchema` | Zod schema factory for serialized amounts. |
| `getNativeFor`, `getTokenFor` | Chain-aware currency constructors. |
| `unwrapToken` | Convert wrapped/native representations where applicable. |

## Amount

```ts twoslash
import { Amount, type Currency } from 'sushi'

declare const currency: Currency

const one = Amount.fromHuman(currency, '1')
const two = one.addHuman('1')

two.toString() // '2'
two.toJSON()
```

| Method | Purpose |
|---|---|
| `new Amount(currency, amount)` | Construct from raw units. |
| `Amount.fromHuman(currency, value)` | Parse a human decimal using currency decimals. |
| `Amount.tryFromHuman(currency, value)` | Safe parse returning `undefined` on failure. |
| `add`, `sub`, `mul`, `div` | Raw-unit arithmetic. |
| `addHuman`, `subHuman`, `mulHuman` | Human-value helpers. |
| `gt`, `gte`, `lt`, `lte`, `eq` | Compare raw values. |
| `wrap` | Wrap the underlying currency. |
| `toJSON` | Serialize safely. |
| `toString`, `toSignificant` | Format for display. |

## Price

`Price` extends `Fraction` and represents a base-to-quote price.

```ts twoslash
import { Amount, Price, type Currency } from 'sushi'

declare const base: Currency
declare const quote: Currency

const price = new Price({
  baseAmount: Amount.fromHuman(base, '1'),
  quoteAmount: Amount.fromHuman(quote, '2'),
})

price.invert()
price.toSignificant(4)
```