<p>Q1: Yes, orders will be partially filled. Some exchanges offer advanced orders that can only be completed wholly, but that's not the default.</p>

<p>Q2: The deciding price is the one that entered the book first. So if first a $90 ask is placed and then a $100 bid is placed, the trade will be executed at $90.</p>

CC BY-SA 3.0
2013-11-14T18:11:35.477Z
2013-11-14T18:11:35.477Z
Meni Rosenfeld
<p>If the order book looks like the following…</p>

<pre><code>A)  Ask: 2 bitcoin at $100

B)  Bid: 2 bitcoin at $100
</code></pre>

<p>A trade will be done from A to B.</p>

<p>But what happens in the following situation:</p>

<pre><code>C)  Ask: 1 bitcoin $100

D)  Bid: 2 bitcoin $100 
</code></pre>

<p><strong>Do bitcoin exchanges partially fill orders?</strong></p>

<p>Does one of the following occur:</p>

<ul>
<li>Nothing the orders need to be the same quantity. </li>
<li>Does the trade occur for one bitcoin.</li>
<li>If the trade does occur, what happens if the bid is cancelled? Is the trade for 1 bitcoin still valid.</li>
</ul>

<p>Also, what happens in this situation:</p>

<pre><code>E)  Ask:2 bitcoin $90

F)  Bid: 2 bitcoin $100
</code></pre>

<p><strong>Does the Bid pay $100 or $90?</strong></p>

<p>Thank You for your help</p>

<exchanges><exchange-order>
How do Bitcoin exchanges fill orders?
Dan H
# How do Bitcoin exchanges fill orders?

(Asked by: username_0 on 2013-11-14)

If the order book looks like the following…

```
A)  Ask: 2 bitcoin at $100

B)  Bid: 2 bitcoin at $100

```

A trade will be done from A to B.

But what happens in the following situation:

```
C)  Ask: 1 bitcoin $100

D)  Bid: 2 bitcoin $100 

```

**Do bitcoin exchanges partially fill orders?**

Does one of the following occur:

* Nothing the orders need to be the same quantity.
* Does the trade occur for one bitcoin.
* If the trade does occur, what happens if the bid is cancelled? Is the trade for 1 bitcoin still valid.

Also, what happens in this situation:

```
E)  Ask:2 bitcoin $90

F)  Bid: 2 bitcoin $100

```

**Does the Bid pay $100 or $90?**

Thank You for your help

**Tags:** exchanges, exchange-order


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## 1 answers

### Answer by username_1 on 2013-11-14. Score: 2 | Accepted answer

Q1: Yes, orders will be partially filled. Some exchanges offer advanced orders that can only be completed wholly, but that's not the default.

Q2: The deciding price is the one that entered the book first. So if first a $90 ask is placed and then a $100 bid is placed, the trade will be executed at $90.


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