Peso Framework

Another thing I've been secretly building is the Peso Framework, a tool to query currency conversion rates.

It started when I was pissed that florianv/exchanger, a tool I was perfectly happy with previously, got a broken release (2.8.2) got abandoned for almost a year now, and still isn't fixed as of this post.

Peso consists of 3 components:

• A service (data source)

• An integration (data consumer)

• A glue library (peso/core) that contains the Service contract, standard request/response objects, and useful tools to develop services and integrations

A simple example:

composer require peso/peso peso/ecb-service php-http/discovery guzzlehttp/guzzle

<?php

use Peso\Peso\CurrencyConverter;
use Peso\Services\EuropeanCentralBankService;

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

// caching omitted for simplicity
$peso = new CurrencyConverter(new EuropeanCentralBankService());

echo $peso->getHistoricalExchangeRate(
    'EUR', // base
    'PHP', // quote
    '2025-06-13', // date (Y-m-d string or DateTime or arokettu/date Date)
), PHP_EOL; // '64.706'

Advantages over the Exchanger:

• Caching moved to the Service side making it more effective

• No way for a service to mistake a historical exchange rate request with a current exchange rate request

• Also currency conversion requests for services that support them

• Ability to add new request types without breaking the backward compatibility

• Services reside in their own separate packages so the main package is not a huge garbage dump of dead or unsupported services like Cryptonator