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I don't know where should I have created this thread, on Service Announcement board or here but I think this board is a better choice because people come here when they have transaction problems.

You probably missed this but recently mempool.space finally added transaction acceleration service on their website.
https://www.talkimg.com/images/2023/12/03/N1Fiz.png (https://www.talkimg.com/image/N1Fiz)

I hope everyone uses RBF or at least CPFP (hope everyone will move on full-RBF) but still, if someone has any problem, they can test this service. I hope they are cheaper than viabtc's paid accelerator, Binance's accelerator and some others.

The acceleration service is have used is viabtc for free it works perfectly for me but that is only when your transaction fee is less than 40 sat/byte it was share in our local board by @Charles-Tim.
The network congestion is really getting out of control, maybe when I am having issues towards confirmation I will also try their free acceleration service as well.

I think this is a typo. The fee should be at least not less than 10 sat/byte. The transaction must also not be more than 500 bytes. Also the transaction must not have unconfirmed parent.

Recently the free accelerator is difficult to use unless you wait for another one hour to submit your txid. It takes seconds for the 100 transactions to have been submitted now. Although, I am still using it and it is working.

You can click that "Accelerate" button and their prices per tier will appear.
And yes, it's significantly cheaper than ViaBTC's paid accelerator, even their maximum tier is less than half of viabtc's asking price.

The issue is, there's currently no user here in Bitcointalk that reported their experience with mempool.space's accelerator.
It would be great to have some legitimate feedbacks.

This belongs to "Service Discussion" board.

I wanted to try the service and it seems that you need to create an account. After creating the account, you need to top up your balance.


It appears that the mining pool that will be adding transactions to it is Foundry USA and I believe that the transaction will be confirmed quickly, the only problem is that changing the priority of transactions according to this method will help them if they decide to filter transactions (such as black lists) without anyone noticing them.

I don't see how that would be a problem. Any mining pool can already reject any transaction they want for any reason they can come up with. If they do, another pool will take the mining fee. If they reject transactions after accepting an additional payment for it, they'll get bad publicity.

AFAIK, their accelerator isn't fully open to the public yet ^{[the feature in question is there, but as soon as you create and verify your account, they'll put you on a waitlist (almost one week and counting...) and that means you can't even top up your account (unfortunately)]}.

Less? It works fine as long as it's above 10sat/b (not vbytes), you can accelerate even a tx that is 100sat/b if you are bored and have nothing to do for 10 minutes.


I hope they add LN payments for that, the whole thing is a bit messy for those accelerators,  if you can't send or receive money because you paid a low fee and now you need to pay a higher fee to get a payment though to get that previous one confirmed it turns to funny situations like this one:

Imagine you have some hosted wallet on an exchange, the dumb mofos send your withdrawal to your wallet with 10sat/b and now you need to accelerate it, you only have BTC there so you make another payment to mempool.space but again, the idiots send the tx with 10sat/b. So you need to accelerate the tx that should have paid for the acceleration  ;D ;D

This is good news if it's truly what it looks like, but for now, I am good with my ViaBTC accelerator which is of course free. However, it's not until I test it that I can conclude about it, or at least someone tests it on BTT to give feedback. But all I've been reading from people's replies are still nothing to write home about, except the one that states we would have an account before using it

I have no issues with that. All the stress will still amount to nothing if it's a free service, but I doubt it. Nevertheless, if the service is cheap compared to the outrageous ones out there, it will still be manageable.

Let's see how far they will be distributing the accelerated service too.

Since I have registered an account with mempool.space since some days ago, this has been what was displayed anytime I signed in:


I am not still able to have access to the accelerator.

I also doubt anyone that knows ViaBTC free accelerator will want to use any paid accelerator.

I noticed recently that ViaBTC accelerator free submission is no more congested all of a sudden, but transaction that has been submitted successfully may not get confirmed in the next block that ViaBTC mine. It is taking longer but it will still later be confirmed.

So how much do we save by using this service?

Say your transaction is 100 sat/byte currently and by using this service how much will it cost effectively?

I don't really get why they would offer a service like this when they can just process the higher transaction fees instead of getting paid less than what they can get on the mempool. Can someone explain what the benefit is to the pool exactly?

Yeah sorry my bad..
I also used it today to accelerate my transaction and this time around I sat it at 50 sat/byte and it confirmed within some minutes or an hour thereabouts, at least this saves some outrageous fee being spent at the cost of withdrawing one's btc to exchange.
But will this ever stop?

Because people will essentially be paying at a premium price. Took a quick look at their pricing and there is a fixed 100K sats as a mempool.space fee among other things -- emphasis on among other things as there is more depending on the transaction/options you choose.

With that said, you don't save anything, the service is more of a desperate attempt/last resort if the situation calls for it. If you wanna save, best to use viabtc's free transaction accelerator and setup your transaction in such a way that it meets viabtc's conditions.

Mine was about a week ago and it's still in their waiting list.
And now, they've even changed the default overview page from "deposit/balance" into "become a sponsor" links.
Perhaps they're suggesting that their sponsors have an advantage or currently required to make it in.

Yeah, bots for some reason, cannot solve the new captcha.
For now, only legitimate users are competing with the 100 free acceleration slots/hr.

In addition to that, supporting payments with other alternative cryptocurrencies that have lower average TX fees will also come in handy.

You have a point, but if the volume of their transaction exceeds ViaBTC's limit for their free accelerator, they have no choice but to use a paid accelerator.

I am not going to spend transaction with low fee and then pay to mempool.space to accelerate it, will be a waste of money and to be honest, I think, it doesn't need any legitimate feedback, it's mempool.space after all and this service will work as advertised.

Good information! I didn't know if it still wasn't fully open to the public yet. I created this thread because I saw accelerate button when I was checking one of my transaction and since it was calculating acceleration fees for every transaction, I thought it was widely ready to use. Good point again, I'll edit my ANN post.

This business of accelerating transaction will dive down when we all support full RBF. Then, everyone will be able to speed up their own transaction without paying additional fees to these companies. Today the problem is that many people still make transaction from wallet that doesn't support RBF.

You are nto saving by using this service. There are times when you don't have enabled RBF and you need to accelerate your transaction. The problem is that every accelerator asks you for enormously high fees and mempool.space offers very competitive prices compared to them.

One additional use of this accelerator is when you empty your wallet and it doesn't confirm, I was tempted to ask a friend who is using a mempool.space to accelerate the transaction coming from the wallet I emptied but was lucky that the transactions confirmed, majority of wallets now have RBF so these accelerators are just another option when you cannot RBF your transaction, but we still need these accelerators in case.

I have noticed that too the new feature and it's definitely 5 times cheaper compared to viabtc but it's not cheaper though.

I just checked the acceleration fee for a random transaction and this is the estimated fee

https://www.talkimg.com/images/2023/12/08/Nx3ra.png

So just make yourself that you are using a wallet that supports RBF and CPFP then you won't end up paying $50 or $500 more than what it used to be.

Unless you're the receiving guy and it's a 5 inputs 40 output tractions that will cost you more to CPFP than what you're receiving  ;)
Neither RBF nor CPFP are magically cures, they will only allow you some movement buy not always, and if we look right now what's happening, most of those tractions stuck that need help around are not made by users but by them claiming their coins from a service, and good luck doing something with those.


First is the limits that have killed the demand, Viabtc has really half closed to gate, so you have to pay 20sat/vb to be sure and keep your tx under 0.5kb, plus of course no unconfirmed parents, so there are times when there are simply no tx out there that match the requirements, as for the next block issue, it happens when ViaBTC has really bad luck and is not getting enough blocks spread across the day, they offer 100tx every hour but sometimes they don't mine a block for 6-7 hours, so not to fill the whole block with cheap tx they postpone a few of them to the next one, I read once something about a 500 cap but don't know how accurate that claim was, probably it's more about size than raw numbers.

I am one of those people that have paid a very low fee long time ago and the fees won't go down to that fee that I've paid for. Can't even use the free accelerator of viabtc. I ended up paying a paid service to accelerate that stuck transaction of mine because it really took long. Learning from my mistake there but at least I've got options now if the same thing happens again in the future and this time, there's this additional accelerator from mempool.space.

Not necessarily. ViaBTC being free is a big plus. But many people know about it, which makes it the go-to place for free transaction acceleration. I am surprised that you have noticed a shorter queue on ViaBTC considering the current congested state of the mempools. Damn Ordinals! Also, if it's true that Mempool.space has partnered with Foundry as the pool that includes the transactions in their blocks, you will get a quicker confirmation since Foundry has more hash power and finds more blocks than ViaBTC. That's an advantage if the unconfirmed transaction is time-sensitive.

I experienced this one when i accelerate my transaction on monday it really take how many hours before my transaction got a confirmation. Checking the last few blocks, it looks like Viabtc doesnt get one, a 1:10 ratio is not even possible, its usually the Foundry, Antpool, and others.

Knowing that 2000 is the average number of transactions in a block then they cater 100 free tx every hour, it could have downside for their Pool. Either they lower the accepted free txs every hour, say 50-80 only, have a cap for free txs in a block, or they stop their free acceleration service.

I have registered since more than a week. This is what I am still seeing as I quote it in a text before. This is the screenshot:

https://www.talkimg.com/images/2023/12/09/EuRYa.jpeg

Although, I do not need a paid accelerator, I will still prefer to always use ViaBTC. My transaction will have 18.5 sat/vbyte segwit transaction, not having unconfirmed parent and not more than 500 bytes. I can wait for the transaction to get confirmed. It was only ones that the transaction got confirmation like 12 hours after I submitted my txid, it has gone back to as usual as the transaction will be confirmed in the next block that ViaBTC mine if successfully submitted. It is taking not more than 3 hours, but it depends also.

It is still 100 transactions. ViaBTC has not stopped its free accelerator service.

Yeah it is pretty ridiculous lately. I can’t move my damn sig payments for cheap. They are stuck in my wallet unless I pay $10-20 to move my damn funds. Electrum don’t even let me broadcast my transaction telling me that i am a cheapfuck who needs to raise the damn fee because greedy fuck miners say so or else they ain’t broadcasting my shiet. The devs should find a solution or bitcoin will end up way worse than legacy banking. At this point swift is cheaper and faster than btc. Wtf?

I ain’t paying you no more than 10sats/byte you greedy fukz

It is not the miners that did not let you to be able to use low fee, it is how the mempool is. Presently, nodes are rejecting transactions with fee rate of 10.7 sat/vbyte or less. As the mempool is becoming congested, so the purging will be getting higher.

I don't understand the purpose of the waiting list. Just allow the people to create their accounts. The more users you have, the greater the chance that some of them will use your paid service, hence, you will benefit from them.

I think PX-Z meant that as a recommendation of what ViaBTC could do in the future. He didn't say that it it's already like that.

Try to switch Electrum servers. Maybe you will get lucky and find one with a more suitable purging fee rate. At the moment, nodes may be deleting (and not allowing) anything that pays less than 10-11 sat/vByte. So either pay more or try to find a different server.

They may need more time and update some of the software related to Foundry memepool to ensure that they receive serious fees compared to the traditional payment method. I don’t know, but if they contract with several mining pools, this may lead to making memepool.space a service that has a large number of visits, so it is better for the users’ experience to be better without problems or the need to contact the support team.

If this is true, then you're right, but it's also worth noting that ViaBTC claims their paid service extends beyond their mining pool:

• Quote
  Paid Service
  ViaBTC cooperates with multiple mainstream mining pools so that your transaction will be proposed and prioritized for quicker confirmation when any of our partner mining pool produces a block.

---

There are no restrictions for creating an account, but you can't use it for anything at the moment... Having said that, their "GitHub repository (https://github.com/mempool/mempool/issues?q=accelerate+)" appears to only have a single open issue about their accelerator, so perhaps it wouldn't take long before it's fully launched.

Yes, that's correct. The free service is for their own mining pool but ViaBTC's paid accelerator can include your transactions in partner blocks as well. Since several people have mentioned that the upcoming service of Mempool.space will be cheaper than ViaBTC's paid plan, I expect that Mempool.space will take a great chunk out of the pie for users looking to spend additional coins to accelerate their unconfirmed transactions.

Acceleration fee is very individual, depends on the transaction fees that are recommended by mempool.space at given time and depends on transaction size. So, everyone will experience individually calculated fees.

If you are not willing to pay, RBF and CPFP are not cures but if you are willing to pay, then, they are. To be fair, as you said, problem are transactions made by 3rd parties that send transaction with low fee and either don't support RBF or are not willing to do anything to increase transaction fee via RBF. So, these companies/services will feed transaction accelerators like mempool.space but things will probably change after Full-RBF.

They've had this service for years, but tightened the rules a bit. I guess it's a "trial" for their paid accelerator service.

I guess so, i'm just concerned of how they performed on mining a block — on how frequent they get the mining reward, or it just other mining pool like faundry has more hashing power than other miners like viabtc. Well, to be honest i'm just concerned their free accelerators because it take so much time before it got a confirmation like i experienced before lol.

But it is free, so i would not complain too much ;).

If you pass all of their restrictions for their free accelerating service, waiting should not be a problem. ViaBTC has ~ 12% of the total hashrate in the network, which is smaller than what Foundry Pool has, which is ~ 25% of the total hashrate, so on average they would surely mine more blocks than ViaBTC.

Actually a 1:10 should be ok, so a block evey two hours.
Viabtc got
- 50 blocks in th last 3 days (that's 50 in 408)  ~12%
- 116 blocks in the last week, (116 in  992)  ~11%
- 20 last 24 hours, again 12% out of 156   

A block every two hours would be pretty doable, but with bad luck, there are gaps:
Yesterday: 12:47:30 > 19:14:18



So what should miners do, let you get  confirmation cheaper than some other guy just like you who pays more?
As long as somebody is paying you more for the job, why would take the lower bid?
Should we make some social score on the chain and give guys how move only $50-$100 priority?
Should we make ratios, one tx per capita per day?

Yes, indeed. But once their mining business become not profitable due to the free txs they accept with how many hours of not getting a block. They will end up limiting free txs or cap txs for every block they mine which end up, either longer confirmation for others txs Or they stop their free service.

This is a good insights and observation. Thank you.

BTW,  visualization of expected blocks in the relevant row shown  on  mempool.space allows you to get to a whole series of initially hidden filters that allow you to highlight various types of transactions, for instance, by   various sighash flags or those ones containing inscriptors (which are of concern to everyone, etc. (see all filters in the image below).

https://www.talkimg.com/images/2024/01/23/kGVa2.png

To make filters visible, click on the goggles icon located at the upper left corner of the visualized block.

Just happened to see this new service on mempool myself and of course, arrived here on the forum to see someone saw it almost 2 months ago. As others note, the price is actually really dependent on your tx and current fee rate.

Yesterday, I sent out an unusual (for me) tx (Segwit, lean, several outputs), costing just under 10000 sats at mempool's "high priority" fee rate. RBF-ing myself to bump up the rate to 10% more was only several thousand sats but Mempool's fee was 40k sats for that. So about 400% on top of the fee paid. It was as if, despite the tx already at what they considered to be a high priority fee, they insisted to bump it up much, much higher.

Take it as you will, I obviously would need to look at many more tx fee to make a good comparison. I just feel they don't really optimise.

I guess they just take the highest end of the spectrum and decide to use that as their basis for fee bumping to get the tx confirmed and not base it on the lowest fee possible to get the tx in the next block. That's lazy acceleration, and I understand that people want to gey their tx confirmed in a timely manner during the busy times, but it seems that I'll stick to Antpool's service if this is how high they put their fees to be.

It's really messed up - having the acceleration for the transaction held up in a queue.

The alternate solution in case they don't want to mess around with LN is to implement account credit. It has its own drawbacks, but at least you'll be able to top it up when fees are not crazy. Assuming you even remember to that is.


Strangely, I have not really seen this feature on Mempool.space at all during that time. Maybe it was on their development version. By the way - did you know that the dev version of Mempool.space where they test all their features is on mempool.ninja?

Yeah, the dynamic price is a bitch when it comes to this, of course it's designed to be a profit service but it  just covers to much the needs of the pool and too little of the client pockets.
The 50k sat per byte is the turnoff for small tx:
a ‎135 vB tx costs now 53 500 sat , $22.89
a ‎14.74 kvB costs now 450 000 sat, $321.33.
But still, way cheaper than the alternatives, Viabtc  is asking for 4x!

I still see
You are currently on the waitlist. You will get notified once you are granted access.
Do you know how much time it takes to get access to the accelerator?
I have set a way to low fee and turned off RBF ... What a mess, there is no confirmation after 1 month ...

If 1 month already passed, most node already drop your transaction from it's node. Depending on which wallet software you use, you can "delete" that unconfirmed transaction and create new ones with better fee rate.

I use bitcoin core QT.
I do not see delete transaction when right clicking on it. (abandon transaction and increase fee (RBF was off) are grayed out)
Transaction is here:
https://mempool.space/tx/42888c7b1540f8d5b9e074d15c2d86d7b03878adf6f173c7316f09910c2dabd9
If I delete, will my sat be back in the wallet?

I've often noticed that too. I'm not sure when this feature can be used.

Yes.

After a month, Bitcoin Core should be able to forget this 1 sat/vbyte transaction. It's even under the purge limit.
Alternatively, you could probably import the private key into Electrum and create a new transaction there, but try first to wipe this transaction from your Bitcoin Core.

Could it be that the delete transaction can only be done if you still have BTC in you wallet?
I get 0 for now.

Silly question to ask... it's impossible to make any transaction in bitcoin blockchain if you have ZER0 coins in your wallet, and zero really needs to be 0, not 0.00012 or similar.
You can't get in negative balance with bitcoin, like you can do with fiat currencies and banks accounts.

I made the payment to empty my wallet, this is why it is at 0 At the moment.
It was not the case before of course.

Yeah, I see you tried to do, but older format addresses you used needs higher fees.
You can wait a very long time for confirmation with minimal 1.00 sat/vB fee that you used, but you can always send more coins to your wallet and accelerate transaction if you are in a hurry.
Next time make sure to check mempool.space before making any (consolidation) transactions.

Just want to confirm this. As far as I understood, if you post in public the transaction that you want to accelerate, you might be in trouble because if you don't accelerate it and will hope that nodes will forget your transaction soon, then there might come someone evil who will push nodes to broadcast your transaction and it will be unconfirmed till the day recommended fees match to your TX fees.

That might not happen for months in the best case, years in the good case and never in the worst case.

No need to post anything: the moment you broadcast a transaction, it's public knowledge. "Someone evil" can just be a node with very large mempool. But for most other nodes, 1 sat/vbyte is still under the purge limit, so they won't even remember it.
The only way to make a signed transaction invalid is by moving at least one of the inputs (with a higher fee).