Filament Money Input Component (this assumes that you are using the MoneyCast from https://github.com/akaunting/laravel-money package for the field in your model, this package is depended on by default in FilamentPHP so this should work out of the box))

MoneyInput.php

<?php

namespace App\Frontend\Forms\Components;

use Closure;
use Akaunting\Money\Money;
use Filament\Support\RawJs;
use Akaunting\Money\Currency;
use Filament\Forms\Components\TextInput;

class MoneyInput extends TextInput
{
    protected bool|Closure|null $masking = null;

    protected bool|Closure|null $allowNegative = null;

    protected string|Currency|Closure|null $currency = null;

    protected function setUp(): void
    {
        parent::setUp();

        $this
            ->inputMode('decimal')
            ->extraInputAttributes(['class' => '!text-xl'])
            ->prefix(fn(MoneyInput $component) => $component->getCurrency()->getPrefix(), isInline: true)
            ->suffix(fn(MoneyInput $component) => $component->getCurrency()->getSuffix(), isInline: true)
            ->stripCharacters(fn(MoneyInput $component) => $component->getCurrency()->getDecimalMark())
            ->formatStateUsing(fn(MoneyInput $component, ?array $state): ?float => $state['value'] ?? null)
            ->dehydrateStateUsing(fn(MoneyInput $component, ?string $state): Money => money(
                amount: floatval(str_replace($component->getCurrency()->getThousandsSeparator(), '', $state ?? '0')),
                currency: $component->getCurrency()->getCurrency(),
                convert: true,
            ))
            ->extraAttributes(['class' => h('[&_.fi-input-wrp-label]:text-3xl [&_.fi-input-wrp-label]:text-primary-700 [&_.fi-input-wrp-label]:select-none dark:[&_.fi-input-wrp-label]:text-primary')])
            ->rule(fn(MoneyInput $component) => function (string $attribute, ?string $value, Closure $fail) use (
                $component
            ) {
                if ( ! $component->getAllowNegative() && floatval($value) < 0) {
                    $fail(t('Field must be a positive number.'));
                }
            });
    }

    public function currency(string|Currency|Closure|null $currency = null): static
    {
        $this->currency = $currency;

        return $this;
    }

    public function masking(bool|Closure $masking = true): static
    {
        $this->masking = $masking;

        return $this;
    }

    public function allowNegative(bool|Closure $allowNegative = true): static
    {
        $this->allowNegative = $allowNegative;

        return $this;
    }

    public function getCurrency(): Currency
    {
        $currency = $this->evaluate($this->currency);

        if ($currency instanceof Currency) {
            return $currency;
        }

        return currency($currency);
    }

    public function getMasking(): bool
    {
        return $this->evaluate($this->masking ?? true);
    }

    public function getAllowNegative(): bool
    {
        return $this->evaluate($this->allowNegative ?? false);
    }

    public function getMask(): string|RawJs|null
    {
        if ( ! $this->getMasking()) {
            return null;
        }

        return RawJs::make(sprintf(
            "\$money(\$input, '%s', '%s', %d);",
            $this->getCurrency()->getDecimalMark(),
            $this->getCurrency()->getThousandsSeparator(),
            $this->getCurrency()->getPrecision(),
        ));
    }
}