title: shapeshift.io API: "Missing a Output Amount or Deposit Amount"
body: <p>Using shapeshift api, posting to <a href="https://www.shapeshift.io/sendamount" rel="nofollow noreferrer">https://www.shapeshift.io/sendamount</a>, I get this error: "Missing a Output Amount or Deposit Amount".</p>
  
  <p>Request JSON String:
  <code>{ "returnAddress" : "19z95ce8a1UwV3PCCCBE7AD7hNXENW3gu4", "withdrawal" : "0xFF7c7d21cf668F59A85188126D88106c62056Ec1", "pair" : "btc_eth", "amount" : "1" }</code></p>
  
  <p>What's wrong?</p>