There are multiple of packages available :
Best one :moneyphp/money
Alternatives :
Torann/laravel-currency
akaunting/money
However, you can actually find these and some more on your own. If you do not find these from google search, packagist can be the place to search for a package using keyword like money, currency in this case and you see downloads, versions and github links etc.
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solved Need a currency converter in a Laravel website [closed]