---

 @Override
    public String getMarketChart(String coinId, int days) throws Exception {
        String url = "https://api.coingecko.com/api/v3/coins/"+coinId+"/market_chart/?vs_currency=usd&days=" + days;

        RestTemplate restTemplate = new RestTemplate();

        try{
            HttpHeaders headers = new HttpHeaders();

            HttpEntity<String> entity = new HttpEntity<String>("parameters",headers);

            ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.GET, entity, String.class);

           return response.getBody();
        }
        catch (HttpClientErrorException e){
            throw new Exception(e.getMessage());
        }
    }