Is there a way to display current live currency data in your app? if so, how and where to i access online data.

Yes. Simplest way to do that is to use REST API. Find a service provider by googling something like "currency REST API". Then call that uri:

 using System.Collections;
 using UnityEngine.Networking;
 
 IEnumerator Start ()
 {
     string uri = "https://api.coindesk.com/v1/bpi/currentprice.json";
     
     var delay = new WaitForSeconds( 10f );
     while( true )
     {
         var www = UnityWebRequest.Get( uri );
 
         var asyncOp = www.SendWebRequest();
         while( asyncOp.isDone==false )
             yield return null;
         
         if( www.result==UnityWebRequest.Result.ConnectionError )
         {
             Debug.LogWarning( www.error );
         }
         else
         {
             string response = www.downloadHandler.text;
             Debug.Log($"Response: {response}");
         }
 
         yield return delay;
     }
 }