exchangerateapi-php

PHP wrapper for exchangerateapi.net with a tiny footprint and pragmatic defaults. It exposes two focused methods that map to the API’s primary endpoints.

• Website: exchangerateapi.net

Why this client?

• No external HTTP dependencies (works anywhere file_get_contents is allowed)
• Clear, typed method signatures
• Familiar PHP arrays for response bodies

Requirements

• PHP >= 8.0
• An API key from exchangerateapi.net

Install

composer require exchangerateapinet/exchangerateapi-php

Quick start

<?php
require __DIR__ . '/vendor/autoload.php';

use ExchangeRateApi\Client;

$client = new Client(getenv('EXCHANGERATEAPI_KEY'));

$latest = $client->latest('USD');
echo $latest['rates']['EUR'] ?? 'n/a';

Configuration

// Change base URL if needed (defaults to https://api.exchangerateapi.net/v1)
$client = new Client(
    apiKey: getenv('EXCHANGERATEAPI_KEY'),
    baseUrl: 'https://api.exchangerateapi.net/v1'
);

API surface

Both methods return decoded associative arrays. If the API reports an error, a RuntimeException is thrown.

latest(string $base, array $symbols = []): array

Fetch the newest conversion rates for a base currency.

Parameters:

• base (required): ISO currency code (e.g., USD, EUR).
• symbols (optional): limit the response to selected currency codes.

Example:

$all     = $client->latest('USD');
$subset  = $client->latest('EUR', ['USD', 'GBP', 'JPY']);

historical(string $date, string $base, array $symbols = []): array

Fetch rates for a given calendar date.

Parameters:

• date (required): YYYY-MM-DD (e.g., 2024-01-02).
• base (required): ISO currency code.
• symbols (optional): restrict to selected codes.

Example:

$onDate  = $client->historical('2024-01-02', 'USD');
$subset  = $client->historical('2024-01-02', 'EUR', ['USD', 'GBP', 'JPY']);

End‑to‑end examples

Run with your key in the environment.

EXCHANGERATEAPI_KEY=your_api_key php examples/latest.php
EXCHANGERATEAPI_KEY=your_api_key php examples/historical.php

Error handling

The client raises a RuntimeException when the API returns an error payload or when the HTTP request fails.

try {
    $client->latest('XYZ'); // invalid base
} catch (\RuntimeException $e) {
    error_log('Request failed: ' . $e->getMessage());
}

Free usage

exchangerateapi.net provides a generous free tier suitable for development, prototypes, and light production workloads. It includes:

• Access to the core endpoints (latest and historical)
• An API key you can obtain in minutes
• Practical rate limits to keep experimentation smooth

Exact allowances (daily/monthly limits, burst caps) can evolve over time. For the most accurate, up‑to‑date details, review the plan information at exchangerateapi.net. If you outgrow the free tier, upgrading is seamless and requires no code changes in this client.

Versioning

This library follows semantic versioning. New features appear in minor versions, breaking changes only in major releases.

Contributing

Issues and pull requests are welcome in the GitHub repository. Please include clear steps to reproduce any problem.

License

MIT