<p>I assume this is a transaction used to test the new Accelerator Service that mempool.space has been working on.</p>
<p>It is my understanding that mempool.space has been working on a transaction accelerator service. The service is supposed to allow users to pay for a higher confirmation priority of a specific transaction out of band (not on-chain). The transaction itself remains unchanged.</p>
<p>From what I hear, they have agreements in place with a large portion of the hashrate to facilitate the service. The fee is only collected on success and returned otherwise. The fee was announced to be shared among all participating pools and mempool.space, not just the successful pool.</p>

CC BY-SA 4.0
2023-12-15T19:50:26.793Z
Interesting. So it is out of Bitcoin protocol and Bitcoin Core node implementation? For example, like paying miners, say, in dollars outside the network, and then they include your transaction in the block even though the fee rate is very low (just enough to enter the mempool) and under normal circumstances it would not enter the block.
LeaBit
CC BY-SA 4.0
2023-12-15T19:53:05.420Z
I guess it could be paid via Lightning as well
Murch
CC BY-SA 4.0
2023-12-15T19:54:23.480Z
Yes, but still outside of "normal" Bitcoin fee/fee rate protocol.
LeaBit
CC BY-SA 4.0
2023-12-15T20:38:53.330Z
Yes the payment is out of band. The transaction is unchanged and gets included in a block even while the transaction’s fees would not warrant inclusion in the block.
Murch
CC BY-SA 4.0
2023-12-15T20:39:53.973Z
I am confused why you often ask to verify information that was already included in the answer and that you understood perfectly judging from how you ask for verification
Murch
CC BY-SA 4.0
2023-12-15T22:29:31.507Z
I don't know. I just want to make sure I understood everything correctly.
LeaBit
CC BY-SA 4.0
2023-12-15T19:32:09.593Z
2023-12-15T23:04:03.133Z
2023-12-15T23:04:03.133Z
Murch
<p>Looking at this <a href="https://mempool.space/tx/4bf900499b3b5f8e3155241c021d17f7db234f50e861bfb92473e35fd1d93d89" rel="nofollow noreferrer">transaction</a>, <em>mempool.space</em> says that it has fee rate of 1.01 sat/vB but its <strong>Accelerated fee rate</strong> is 446 sat/VB.</p>
<p>Until now, I have come across the term Effective fee rate which represents the fee rate of the group in the context of CPFP. However, what is the <strong>Accelerated fee rate</strong>?</p>

<transaction-fees><mempool.space>
What is Accelerated fee rate?
LeaBit
# What is Accelerated fee rate?

(Asked by: username_0 on 2023-12-15)

Looking at this [transaction](https://mempool.space/tx/4bf900499b3b5f8e3155241c021d17f7db234f50e861bfb92473e35fd1d93d89), *mempool.space* says that it has fee rate of 1.01 sat/vB but its **Accelerated fee rate** is 446 sat/VB.

Until now, I have come across the term Effective fee rate which represents the fee rate of the group in the context of CPFP. However, what is the **Accelerated fee rate**?

**Tags:** transaction-fees, mempool.space


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## 1 answers

### Answer by username_1 on 2023-12-15. Score: 1 | Accepted answer

I assume this is a transaction used to test the new Accelerator Service that mempool.space has been working on.

It is my understanding that mempool.space has been working on a transaction accelerator service. The service is supposed to allow users to pay for a higher confirmation priority of a specific transaction out of band (not on-chain). The transaction itself remains unchanged.

From what I hear, they have agreements in place with a large portion of the hashrate to facilitate the service. The fee is only collected on success and returned otherwise. The fee was announced to be shared among all participating pools and mempool.space, not just the successful pool.

> **Comments:**
> **username_0**: Interesting. So it is out of Bitcoin protocol and Bitcoin Core node implementation? For example, like paying miners, say, in dollars outside the network, and then they include your transaction in the block even though the fee rate is very low (just enough to enter the mempool) and under normal circumstances it would not enter the block.  
> **username_1**: I guess it could be paid via Lightning as well  
> **username_0**: Yes, but still outside of "normal" Bitcoin fee/fee rate protocol.  
> **username_1**: Yes the payment is out of band. The transaction is unchanged and gets included in a block even while the transaction’s fees would not warrant inclusion in the block.  
> **username_1**: I am confused why you often ask to verify information that was already included in the answer and that you understood perfectly judging from how you ask for verification  
> **username_0**: I don't know. I just want to make sure I understood everything correctly.  

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