Fixer.io API Wrapper

A wrapper around Fixer.io's currency conversion rates API with minimal dependencies. Upgrading applications is always a hassle. This project aims to help relieve some of that pressure by depending exclusively on PSR interfaces instead of hard dependencies - while maintaining a comfortable API.

An additional goal of this project is to always deliver typed results. There's very little guessing about associative arrays involved when consuming this API.

Supported Endpoints

• Supported Symbols
• Latest Rates
• Historical Rates
• Convert Currency
• Time Series
• Fluctuation

Usage

use Nacoma\Fixer\ExchangeFactory;
use Nacoma\Fixer\Http\Client;
use Nacoma\Fixer\Http\Middleware\ETagMiddleware;

$client = new Client(new Psr18Client(), [
    new ETagMiddleware(
        new SimpleCache(),
        new Psr17ResponseFactory(),
        new Psr17StreamFactory(),
    )
]);

$exchangeFactory = new ExchangeFactory(
    $client,
    new Psr17RequestFactory(),
    new Psr17UriFactory(),
    'your-access-key',
);

$exchange = $exchangeFactory->create('USD', ['EUR', 'JPY']);

// obtaining all rates
$result = $exchange->latestRates();

// manual conversion
$converted = 50 * $result->rates['EUR'];

// API endpoint conversion
$converted = $exchange->convert('USD', 'EUR', 50);

The optional Nacoma\Fixer\Http\Client is a thin Psr-18 compatible wrapper around any HTTP client. It enables custom middleware chaining in order to support caching via the ETag header.