title: Coinbase Wallet API - Set fee on send transaction
body: <p>Is it possible to set a fee (miner fee) on a transaction when sending BTC / ETH / LTC using the Coinbase Wallet API?</p>
  
  <p>What I know:</p>
  
  <ol>
  <li>Coinbase automatically sets the fee when using the website and this can't be customised.</li>
  <li><p>The API documentation shows a parameter where one should be able to specify the fee (<a href="https://developers.coinbase.com/api/v2#send-money" rel="nofollow noreferrer">https://developers.coinbase.com/api/v2#send-money</a>). However, making any requests with this parameter returns an error message: </p>
  
  <p>{"errors":[{"id":"validation_error","message":"The transaction fee has expired."}]}</p></li>
  </ol>
  
  <p>Just want to know if it is possible to specify a fee at all, and if so how you went about it.</p>