Paid pool acceleration works, free rebroadcasting usually does nothing, and most people who pay did not need to. In the records we sampled, the median accelerated transaction was already paying 2.0 sat/vB, comfortably enough for the next block. Quotes ran 3 to 17 times the real fee shortfall.
Ask this question anywhere and you get two answers, both useless. Accelerator sites say yes, obviously, here is our button. Reddit says no, it is a scam, just wait. Neither camp shows any numbers.
So we went and got some. Over the past few days we queried the public records of the largest pool backed accelerator, pulled its live pricing for real unconfirmed transactions, recomputed the hashrate its partners actually control from block data, and checked which competing services are even alive. This article is what came back.
The honest summary is that the technology is real and the pricing is not. There is a genuine mechanism by which a mining pool can push your transaction into a block, and it does work. There is also a large gap between what that service is worth and what it is sold for, and a much larger population of people buying it who never needed it. Both things are true at once, and nobody in this niche says so, because everybody in this niche is selling something.
We run a free accelerator too. It rebroadcasts to 20 independent nodes and it tells you when that will not help you, which is most of the time. That is the only reason we are comfortable publishing the numbers below.
What people actually mean by an accelerator
The word covers four completely different things that share a marketing category and nothing else. Getting them straight is most of the work, because the arguments about whether accelerators work are usually two people talking about different mechanisms.
| Mechanism | What it does | Who can use it | Does it work |
|---|---|---|---|
| Free rebroadcast | Resends your transaction to well connected nodes | Anyone | Only if the network lost it |
| Paid pool acceleration | Pools treat your transaction as higher paying when building blocks | Anyone who pays | Yes, weighted by their hashrate |
| RBF | You re-sign the same payment with a higher fee | Sender only | Yes, and it is nearly free |
| CPFP | A high fee child transaction drags the parent into a block | Sender or receiver | Yes |
Only the first two are what people buy. The last two are what most people should be doing instead, and we cover both step by step in the RBF and CPFP section on the homepage.
What a free rebroadcast really does
A free accelerator takes your transaction ID, fetches the raw transaction, and pushes it to a list of nodes. Ours pushes to 19 of them. Others claim 10 or 20. The list is not the interesting part.
The interesting part is what happens when those nodes already have your transaction, which they almost always do. Bitcoin gossips aggressively. A transaction broadcast from a normal wallet reaches most of the network within seconds. When we relay a transaction that has been sitting unconfirmed for hours, most nodes answer with some version of "already have that one".
Sending it again to a node that already holds it changes nothing. It does not raise the fee, it does not move the transaction up any queue, and it does not make a miner more likely to select it. Miners choose transactions by fee rate, and rebroadcasting does not touch the fee rate.
The claim to be suspicious of
If a site tells you that rebroadcasting will speed up a transaction that the whole network already holds, that claim is false. It is the single most common piece of misinformation in this niche, and it is what makes people call the entire category a scam.
Why the free tier still exists
Because it is cheap to run and it converts. A visitor arrives worried, presses a button, watches a list of green ticks appear, and feels helped. Nothing happened on the network, but the visitor is now on a page with ads on it, or looking at a paid upgrade.
That is the honest explanation for why nearly every free accelerator shows you a wall of identical success badges and no detail. Detail would reveal that most of those nodes already had your transaction.
The one case where rebroadcasting is the cure
There is a real scenario, and it is the reason we still run the free service.
Your transaction never propagated
Wallet broadcasts fail silently more often than people expect. A phone loses connection at the wrong moment, a node rejects the transaction on a policy rule and the wallet does not surface the error, a desktop wallet is running behind a firewall that blocks outbound peers. The wallet shows the payment as sent. The network never saw it.
If no explorer can find your transaction ID, this is probably what happened. A wide push to many independent nodes is exactly the right tool.
Your transaction was dropped
Bitcoin Core discards unconfirmed transactions after 336 hours, which is 14 days. Nodes also evict low paying transactions early when the mempool hits its size limit. Either way, once it is gone, it is gone, and there is nothing for a miner to include.
Rebroadcasting reintroduces it. You need the signed raw transaction hex for this, not just the transaction ID, because no node has a copy to hand you any more. Most desktop wallets can export it.
Worth knowing
You will see it written all over the web that transactions are purged after 72 hours. Bitcoin Core's actual default is 336 hours. The 72 hour figure is repeated on several pages that currently rank for this topic, and it is wrong.
Find out which case you are in
Paste your transaction ID and we tell you whether the network has it, what it is paying, and whether rebroadcasting will do anything for you. Free, no signup.
How paid pool acceleration works
This one is real, and the mechanism is worth understanding because it explains both why it works and why developers dislike it.
When a mining pool builds a candidate block it picks transactions from its own mempool, sorted by fee rate, until the block is full. An accelerator has an agreement with a set of pools. You pay the accelerator, the accelerator tells those pools to treat your transaction as though it paid a much higher fee, and the pools slot it in accordingly.
Nothing about your transaction changes. The fee written into it stays the same, the transaction ID stays the same, and every other node on the network still sees the original low paying transaction. The extra money moves off chain, from you to the accelerator to the pool. This is why the practice is called an out of band fee.
Why it is probabilistic, not guaranteed
The pools you paid only control part of the network's hashrate. They can only include your transaction in blocks they themselves find. If the next block is found by a pool outside the arrangement, your transaction is not in it, and you wait for the next one.
So the real promise is not "next block". It is "included in the next block found by one of these pools", which is a probability, not a schedule.
We checked the hashrate claim
The largest accelerator says its partner pools control over 80 percent of hashrate. That claim gets repeated by resellers without verification, so we tested it. We took the list of pool identifiers the service returns, matched them against the pools that actually found blocks over the past month, and added up the blocks.
The claim holds up. Foundry USA, AntPool, F2Pool, SpiderPool and MARA between them account for most of it. Notably ViaBTC, which runs its own competing accelerator, is not in the list, and neither is OCEAN.
What the public acceleration records show
The largest accelerator publishes its own history through an open endpoint, and almost nobody reads it. We did.
| Metric | Value | What it tells you |
|---|---|---|
| Accelerations requested | 30,381 | Total since April 2023 |
| Accelerations completed | 29,775 | Completion rate 98.0 percent |
| Total paid to miners | 2.909 BTC | Roughly $225,700 over three years |
| Busiest month | 3,050 in Oct 2024 | About 102 per day at peak |
| Recent month | about 750 | About 25 per day now |
Two things jump out. The first is that the whole market is small. Twenty five accelerations a day, worldwide, through the dominant provider. The second is that it has shrunk by roughly three quarters since late 2024, which lines up exactly with fees collapsing and staying collapsed.
The 98 percent completion rate looks fantastic until you think about what it measures. It counts transactions that confirmed after being accelerated. In a market where almost everything confirms quickly anyway, that number would be high whether the service did anything or not.
The detail that changes the picture
We sampled the individual acceleration records over a full day. For each one we can see the fee rate the transaction was already paying before anyone paid anything.
What the sampled accelerations were actually paying
- Median fee rate before acceleration: 2.0 sat/vB
- Median extra paid to miners: 2,500 satoshis, about $1.94
- Median time from paying to confirmation: 23.9 minutes, roughly two to three blocks
- Highest fee rate we saw someone accelerate: 11.17 sat/vB
Read that middle line again. The median customer paid, then waited about two and a half blocks. Not next block. Two and a half.
And the first line is the uncomfortable one. A transaction paying 2.0 sat/vB, in a market where the next block currently clears at about 1.0 sat/vB, was already going to be mined. Somebody paid to accelerate a transaction that needed no help at all. The person paying 11.17 sat/vB was several times above the going rate and paid anyway.
What it costs against what it is worth
The pricing endpoint is public too, so you can ask what a specific transaction would cost to accelerate, and compare that against the actual gap between what the transaction pays and what the next block needs. We did this on live unconfirmed transactions.
| Transaction | Actual fee shortfall | Cheapest option offered | Markup | Most expensive option |
|---|---|---|---|---|
| 2,660 vB, 19 ancestors | 1,729 sats, about $1.34 | 10,000 sats, about $7.76 | 5.8x | 30,000 sats (17.4x) |
| 3,162 vB, 25 ancestors | 5,672 sats, about $4.40 | 17,500 sats, about $13.58 | 3.1x | 60,000 sats (10.6x) |
The shortfall column is the honest number. It is what the transaction is missing to reach the next block, and it is what you would pay a miner if you simply raised the fee yourself with a fee bump. On the first transaction that is 1,729 satoshis. The service asks 10,000 to start.
To be fair to the provider, some of that gap is a real business. They maintain pool relationships, they run infrastructure, they take payment risk, and they are entitled to a margin. The question is whether the margin is 3x or 17x, and whether the buyer has any way to see which they are getting. Currently they do not, because the shortfall is never shown next to the price.
See your own numbers before anyone quotes you
We show your effective fee rate, the rate the next block is actually clearing at, and the exact shortfall in satoshis. Then you can decide.
Why so many paid accelerations were unnecessary
This comes down to a change in the fee market that most people have not registered, and that most accelerator marketing still ignores.
Right now the mempool holds 85,605 transactions and looks 44 blocks deep. That sounds like severe congestion, and screenshots of it get used to sell acceleration. But only 2.34 percent of that backlog is paying 1 sat/vB or more, and 68.9 percent of it sits in a narrow band between 0.1 and 0.2 sat/vB. The single highest paying transaction anywhere in the mempool is 6.08 sat/vB.
The whole mempool contains about 0.10 BTC in fees. That is less than one twentieth of a block subsidy, spread across eighty five thousand transactions.
What happened is that Bitcoin Core 29.1 lowered the default minimum relay fee to 0.1 sat/vB in September 2025. Wallets started letting people broadcast at that floor. A permanent queue of floor rate transactions built up, and it never drains, because new ones arrive as fast as old ones leave. It looks like a backlog. It does not compete with you unless you are in it. We go through this in detail in the why transactions get stuck section.
So the picture an accelerator shows you, a huge backlog and your transaction somewhere in it, is technically accurate and completely misleading. If you are paying 1 sat/vB or better you are ahead of 97 percent of that queue.
Why Bitcoin developers dislike the practice
This part rarely appears on accelerator sites, and it is the strongest argument against routine use.
Bitcoin Optech, the technical newsletter that most protocol developers read, describes out of band fees as a censorship resistance problem. The reasoning is simple. Miners with more hashrate find blocks more consistently, so a user who wants speed will pay the biggest miners, because paying a small pool buys almost nothing. If paying miners directly becomes normal, fee revenue concentrates in the largest pools, and the number of parties you would need to compromise in order to censor a transaction gets smaller.
There is a second, subtler cost. Fees paid inside a transaction are visible to everyone and inform fee estimation for the whole network. Fees paid off chain are invisible. The more acceleration happens, the less anyone can tell what block space actually costs.
None of this means you are doing something wrong by paying once to unstick a payment. It does mean the practice is not free of consequences, and it is worth knowing that the people who build Bitcoin would rather you raised the fee on chain.
When paying is genuinely justified
There is a real case. It is narrower than the marketing suggests, but it exists.
You cannot raise the fee yourself
This is the main one, and it almost always means an exchange withdrawal. The exchange signed the transaction, so you cannot replace it. If the exchange used a low fee and will not bump it, and you have no output of your own to spend, an accelerator may be your only lever.
The receiver cannot help either
A fee bump from the receiving side, spending the incoming output at a high fee, solves many of these situations for a few hundred satoshis. If the recipient is a service that will not do that, and you are the one waiting, acceleration is back on the table.
The delay is genuinely expensive
If a payment window closes, an order cancels, or a counterparty walks, then spending a few dollars to raise the odds on the next block is a rational trade. Most delays are not like this. Most delays are somebody refreshing an explorer at two in the morning.
The test we would apply
Pay only when all three are true. You cannot raise the fee yourself, nobody on the other side can either, and waiting another few hours would cost you more than the quote. If any one of those is false, keep your money.
How to check before you pay anyone
Five minutes of checking replaces the entire question. In order:
- Confirm it is really unconfirmed. A surprising share of panics are about transactions that already confirmed, or about the wrong transaction ID entirely.
- Find its effective fee rate. Not fee divided by size. If your transaction depends on unconfirmed parents, miners score the whole package, and the package rate is the number that matters.
- Find what the next block is clearing at. This changes hour to hour. Compare the two numbers. If yours is higher, you are in line already.
- Work out the shortfall in satoshis. If there is a gap, this is what closing it actually costs on chain.
- Compare that against any quote. Now the decision is arithmetic rather than anxiety.
Our free checker does all five and shows the shortfall next to what the largest paid service would quote for the same transaction. We built it that way deliberately, because the comparison is the part everyone else leaves out.
How to spot a scam accelerator
The category has a genuine fraud problem, and even the legitimate operators say so. One of the oldest services writes on its own pricing page that when it launched in 2022 there was only one other honest provider and the rest were scams.
Six things separate a working service from a trap.
| Red flag | What a real service does |
|---|---|
| Asks for your seed phrase or private key | Needs only the public transaction ID |
| Anonymous prepay to a bare address, no receipt | Named service, invoice, contactable, refund policy |
| Guarantees confirmation in a fixed time | Explains it is probability weighted by hashrate |
| A wall of identical green ticks, no detail | Names each node, its answer, and its latency |
| Claims rebroadcasting always speeds things up | Tells you when it will not help |
| Nothing it claims can be verified | Everything is checkable on a public explorer |
The seed phrase one is not a subtle warning sign, it is theft in progress. Acceleration mathematically cannot require your keys. Anyone asking is not accelerating anything.
There is a full walkthrough with verification steps in the scam checklist on the homepage, and the node list we relay through is published in full so you can query any of them yourself.
The bottom line
Paid pool acceleration is a real service that does a real thing. The pools exist, the arrangement exists, we verified the hashrate ourselves at 83.1 percent, and transactions do get mined. Anyone calling the whole category fake is wrong.
But the market is tiny, about 25 accelerations a day through the dominant provider, and shrinking. Prices run 3 to 17 times the actual fee shortfall. The median buyer in our sample was already priced for the next block and paid anyway, then waited two and a half blocks. And the fee environment that made acceleration valuable, real congestion with real competition for block space, has not existed for over a year.
If you can raise your own fee, raise your own fee. It costs a few hundred satoshis and it works every time, on every pool, not just the ones somebody has a deal with. If you cannot raise it and the delay genuinely hurts, acceleration is a reasonable purchase, and you should know what the shortfall was before you agree to the price.
Check first. It is free, and most days it tells you to keep your money.
Check your transaction free
We push it to 20 independent nodes, show every answer, and tell you honestly whether you need to pay anyone. Most days the answer is no.
Frequently asked questions
Do free Bitcoin transaction accelerators actually work?
Only in two situations. A free accelerator rebroadcasts your transaction to well connected nodes. If those nodes already hold it, which is usually the case, resending it changes nothing at all. Rebroadcasting genuinely helps when the transaction never propagated from your wallet in the first place, or when it was dropped from mempools after the 14 day expiry and needs to be reintroduced.
Do paid Bitcoin accelerators actually work?
Yes, the mechanism is real. You pay a service, the service asks partner mining pools to treat your transaction as if it paid a higher fee, and those pools include it in the blocks they find. We verified that the pools partnered with the largest accelerator found 83.1 percent of blocks in the last month. The transaction itself is never modified. The catch is price, not capability.
How much do Bitcoin accelerators cost?
We queried the largest accelerator's public pricing endpoint for real unconfirmed transactions. On one transaction the genuine fee shortfall was 1,729 satoshis and the cheapest option offered was 10,000 satoshis, which is 5.8 times the shortfall. On another the shortfall was 5,672 satoshis against a cheapest option of 17,500, which is 3.1 times. The most expensive options ran 10 to 17 times the shortfall.
Is a Bitcoin accelerator worth it?
Usually not. In the acceleration records we sampled, the median accelerated transaction was already paying 2.0 sat/vB, which was above the rate needed for the next block. Those buyers paid for a queue position they already held. Acceleration is worth paying for when you cannot raise the fee yourself, which mainly means an exchange withdrawal, and the payment genuinely cannot wait.
Why do Bitcoin developers dislike transaction accelerators?
Because paying miners outside the transaction weakens censorship resistance. Bitcoin Optech notes that miners with more hashrate produce blocks more consistently, so users wanting fast confirmation will pay the largest miners rather than small ones. Routine out of band payment therefore pushes fee revenue toward the biggest pools and encourages mining centralisation.
Can an accelerator confirm a transaction that is not in the mempool?
Only if it has the full raw transaction, not just the transaction ID. If your transaction was dropped after the 14 day expiry, no node holds it and there is nothing for a pool to include. You need to rebroadcast the signed raw transaction hex so it re-enters the mempool. This is the one case where a rebroadcast service is genuinely the correct tool.