> For the complete documentation index, see [llms.txt](https://developer.esw.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.esw.com/pricing-advisor-api/pricing-advisor-api/core-concepts/fx-rates-and-models.md).

# FX Rates & Models

Standard advice includes a separate `fxRates` array containing ESW-managed foreign exchange rates. These are the same rates used internally to compute the multipliers.

#### FxRateResponse

<table><thead><tr><th width="123">Field</th><th width="131">Type</th><th>Description</th></tr></thead><tbody><tr><td>from</td><td>string</td><td>Source currency ISO code (e.g., <code>"GBP"</code>). This is the retailer's base currency.</td></tr><tr><td>to</td><td>string</td><td>Target currency ISO code (e.g., <code>"EUR"</code>). The shopper's local currency.</td></tr><tr><td>rate</td><td>number</td><td>The conversion rate. <code>1 unit of "from" = rate units of "to"</code>.</td></tr></tbody></table>

{% tabs %}
{% tab title="FX rates from a StandardAdvice response" %}
{% code expandable="true" %}

```json
{
  "fxRates": [
    { "from": "GBP", "to": "EUR", "rate": 1.1732 },
    { "from": "GBP", "to": "JPY", "rate": 189.42 }
  ]
}
```

{% endcode %}
{% endtab %}
{% endtabs %}

FX rates are updated daily. The `lastUpdated` field in the top-level response indicates when the rates were last refreshed. Compare `version` numbers to detect changes in your caching layer.


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