walletservice/app/Http/Controllers/HelperController.php

<?php

namespace App\Http\Controllers;

use App\Traits\ApiResponser;
use Illuminate\Support\Facades\DB;

class HelperController extends Controller
{
    use ApiResponser;
    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    public function countries()
    {
        $countries = DB::select('SELECT id , name , currency_code FROM countries_currencies WHERE id IN (
					 SELECT distinct c.id FROM networks n INNER JOIN countries_currencies c ON n.country_id=c.id INNER JOIN configWallet cw ON cw.id_network = n.id WHERE status = 1
					)');
        return $this->successResponse($countries);
    }
}