Untitled

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">
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  <script>
    $(document).ready(() => {
      endpoint = 'latest'
      access_key = 'сложете_ваш_ключ';

      $(".btn-block").click(() => {
        $.ajax({
          url: 'http://data.fixer.io/api/' + endpoint + '?access_key=' + access_key,
          dataType: 'jsonp',
          success: function(json) {

          }
        });
      });
    });
  </script>
</head>
<body>
  <div class="container">
    <div class="row flex-column ">
      <div class="col-6 mt-3 mx-auto">
        <div class="form-group">
          <select class="custom-select user-select">
            <option selected="">Избери валута</option>
            <option value="1">Български лев</option>
            <option value="2">Щатски долар</option>
            <option value="3">Японска йена</option>
          </select>
        </div>
        <div class="form-group">
            <label for="">Сума в Евро</label>
            <input type="text" class="form-control from-field">
        </div>
        <div class="form-group">
            <label for="">Крайна сума</label>
            <input type="text" class="form-control to-field">
        </div>
        <div class="form-group">
          <input type="button" class="btn btn-primary btn-block" value="Конвертирай">
        </div>
      </div>
    </div>
  </div>

</body>
</html>