const url = 'https://api.openfx.com/v3/fx/balances';
const options = {
  method: 'GET',
  headers: {Authorization: 'Bearer <token>', 'X-Request-Signature': '<api-key>'}
};

fetch(url, options)
  .then(res => res.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));

import requests
# sign_request mints a fresh 60s JWT AND the matching X-Request-Signature. See Authentication
url = 'https://api.openfx.com/v3/fx/balances'
headers, _ = sign_request('GET', url)
balances = requests.get(url, headers={**headers}).json()['data']

HttpResponse<String> response = Unirest.get("https://api.openfx.com/v3/fx/balances")
  .header("Authorization", "Bearer <token>")
  .header("X-Request-Signature", "<api-key>")
  .asString();

CURL *hnd = curl_easy_init();

curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "GET");
curl_easy_setopt(hnd, CURLOPT_WRITEDATA, stdout);
curl_easy_setopt(hnd, CURLOPT_URL, "https://api.openfx.com/v3/fx/balances");

struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "Authorization: Bearer <token>");
headers = curl_slist_append(headers, "X-Request-Signature: <api-key>");
curl_easy_setopt(hnd, CURLOPT_HTTPHEADER, headers);

CURLcode ret = curl_easy_perform(hnd);

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api.openfx.com/v3/fx/balances"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("X-Request-Signature", "<api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

# X-Request-Signature is an ES256 signature; compute it with one of the
# language helpers in /v3/authentication (shell signing is impractical).
curl https://api.openfx.com/v3/fx/balances \
  -H "Authorization: Bearer $OPENFX_JWT" \
  -H "X-Request-Signature: $OPENFX_SIGNATURE"