user3837: The online wallet blockchain.info allows for the fee policy to be customised:

The "Normal" policy states
Follow the fee policy suggested by the mainline bitcoin client.

What is the fee policy suggested by the mainline bitcoin client explicitly?

user11369: https://en.bitcoin.it/wiki/Transaction_fees

Otherwise, the reference implementation will round up the transaction size to the next thousand bytes and add a fee of 0.1 mBTC (0.0001 BTC) per thousand bytes.

So the rate is 0.1 mBTC for each thousand bytes (rounded up) the transaction is.

3837: <p>The online wallet <a href="http://blockchain.info" rel="nofollow noreferrer">blockchain.info</a> allows for the fee policy to be customised:</p>

<p><img src="https://i.stack.imgur.com/8oDmZ.png" alt="enter image description here"></p>

<p>The "Normal" policy states</p>

<pre><code>Follow the fee policy suggested by the mainline bitcoin client.
</code></pre>

<p>What is the fee policy suggested by the mainline bitcoin client explicitly?</p>
 11369: <p><a href="https://en.bitcoin.it/wiki/Transaction_fees">https://en.bitcoin.it/wiki/Transaction_fees</a></p>

<blockquote>
  <p>Otherwise, the reference implementation will round up the transaction size to the next thousand bytes and add a fee of 0.1 mBTC (0.0001 BTC) per thousand bytes.</p>
</blockquote>

<p>So the rate is 0.1 mBTC for each thousand bytes (rounded up) the transaction is.</p>
