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

# Amounts and currencies

> How Spritz represents money in requests and responses.

Money in the Spritz API is always a **decimal string**, never a number. Fiat amounts are
formatted with two decimal places, like `"100.00"` or `"1000.50"`. Representing money as
strings avoids the rounding errors that come with floating-point numbers.

## Working with amounts

* **Send and receive amounts as strings**: `"100.00"`, not `100` or `100.0`.
* **Parse them with a decimal or big-number type**, never a native float. Summing or
  comparing floats can silently lose cents.
* Every fiat amount comes with a currency alongside it.

```json theme={null}
{
  "output": { "amount": "100.00", "currency": "USD" },
  "fees":   { "amount": "1.25", "currency": "USD" }
}
```

## Currencies

Fiat amounts use ISO 4217 currency codes. Spritz currently works with `USD`, `CAD`,
`EUR`, and `GBP`. See [What we support](/guides/supported) for the rails and regions
behind each.

## On-chain amounts

Amounts you send or receive on-chain follow each blockchain's own conventions, so a
token value in transaction parameters may be in the token's base units rather than a
decimal string. Use the values exactly as the API returns them when building the
transaction, and check them against the human-readable fiat amounts in the quote. See
the [off-ramp guide](/guides/use-cases/off-ramp) and the
[API Reference](/api-reference) for the fields on each endpoint.