title: How to call Binance /futures/data/openInterestHist Market Data Endpoint?
body: <p>The documentation states that the request header must contain the api key. </p>
  
  <p>My request looks like this:</p>
  
  <pre><code>import requests
  
  headers = {
      'X-MBX-APIKEY': api_key
  }
  
  requests.get('https://binance.com/futures/data/openInterestHist?symbol=BTCUSD&amp;period="5m"&amp;limit=30', headers=headers)
  </code></pre>
  
  <p>Result is:
  <code>&lt;Response [400]&gt;</code></p>
  
  <p>I also tried to send a signed request with the same result.</p>
  
  <p>What am I doing wrong? </p>