frankfurter/README.md

# Frankfurter

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Frankfurter is a free and open source API for current and historical foreign exchange rates. It tracks data published by the European Central Bank. Rates update around 4PM CET every working day.

Use our public instance or self host with Heroku or Docker.

## Examples

Get the current foreign exchange rates.

```http
GET /latest HTTP/1.1
```

Get historical rates for any day since 1999.

```http
GET /2000-01-03 HTTP/1.1
```

Get historical rates for a time period.

```http
GET /2010-01-01..2010-01-31 HTTP/1.1
```

Get historical rates for a time period up to the present.

```http
GET /2010-01-01.. HTTP/1.1
```

Get a list of available currency symbols, along with their full names.

```http
GET /currencies HTTP/1.1
```

Rates quote against the Euro by default. Quote against a different currency.

```http
GET /latest?from=USD HTTP/1.1
```

Request specific exchange rates.

```http
GET /latest?to=USD,GBP HTTP/1.1
```

Convert a specific amount.

```http
GET /latest?amount=1000&from=GBP&to=USD HTTP/1.1
```

With a full list of currencies, time series grow large in size. For better performance, use the to parameter to reduce the response weight.

```http
GET /2016-01-01..2016-12-31?from=GBP&to=USD HTTP/1.1
```

Here we return the current GBP/USD currency pair with JavaScript.

```js
// Fetch and display GBP/USD
fetch('/latest?from=GBP&to=USD')
  .then(resp => resp.json())
  .then((data) => { alert(`GBPUSD = ${data.rates.USD}`); });
```

Cache data whenever possible.