<p>It is related to the <code>prioritisetransaction</code> RPC, which changes what fee a transaction has for the purpose of inclusion in blocks.</p>

<p>If you never use <code>prioritisetransaction</code>, the modified fee will always be equal to the real fee.</p>

CC BY-SA 3.0
2017-10-04T22:19:55.407Z
Oh thanks! I thought it relates to either RBF or CPFP! :)
Karel Bílek
CC BY-SA 3.0
2017-10-04T21:14:59.833Z
2017-10-04T21:14:59.833Z
Pieter Wuille
<p>In mempool dump through <code>getrawmempool true</code>, I see something called <code>modifiedfee</code>.</p>

<p>It seems to be the same in all cases (just by looking at the dump). What exactly is it, how does it relate to <code>fee</code> (that is also present)?</p>

<p>The help says</p>

<blockquote>
  <p>(numeric) transaction fee with fee deltas used for mining priority</p>
</blockquote>

<p>but that is not very helpful; that just seems like normal fee.</p>

<p>edit: I went trough the file by iterating over the dump, and modifiedfee and fee are indeed the same on all the transactions.</p>

<bitcoind><transaction-fees><mempool>
What is `modifiedfee` in mempool dump, how is it related to actual fee?
Karel Bílek
# What is `modifiedfee` in mempool dump, how is it related to actual fee?

(Asked by: username_0 on 2017-10-04)

In mempool dump through `getrawmempool true`, I see something called `modifiedfee`.

It seems to be the same in all cases (just by looking at the dump). What exactly is it, how does it relate to `fee` (that is also present)?

The help says

> (numeric) transaction fee with fee deltas used for mining priority

but that is not very helpful; that just seems like normal fee.

edit: I went trough the file by iterating over the dump, and modifiedfee and fee are indeed the same on all the transactions.

**Tags:** bitcoind, transaction-fees, mempool


---

## 1 answers

### Answer by username_1 on 2017-10-04. Score: 1 | Accepted answer

It is related to the `prioritisetransaction` RPC, which changes what fee a transaction has for the purpose of inclusion in blocks.

If you never use `prioritisetransaction`, the modified fee will always be equal to the real fee.

> **Comments:**
> **username_0**: Oh thanks! I thought it relates to either RBF or CPFP! :)  

---

