FOX - WooCommerce Currency Switcher Professional

Open your current wp theme functions.php file and drop there next code:

add_filter('woocs_raw_woocommerce_price', function($price) {
    return round($price + 0.01) – 0.01;
});

Also you can do manipulations for selected currencies using IF:

add_filter('woocs_raw_woocommerce_price', function ($price) {
    global $WOOCS;
    if ($WOOCS->current_currency === 'USD') {
        $price = round($price + 0.01) - 0.01;
    }
    /*
      if ($WOOCS->current_currency !== 'EUR') {
      $price = round($price + 0.01) - 0.01;
      }
     * 
     */
    return $price;
});

Read also: https://currency-switcher.com/hook/woocs_raw_woocommerce_price/ + https://currency-switcher.com/woocs_woocommerce_variation_prices

Origin: https://wordpress.org/support/topic/round-price-xx-99/