Recently, Bitcoin transactions have taken much longer to confirm due to a massive backlog in the Blockchain network. If you make a transaction paying a lower fee, you will probably wait a very long time, just kidding, it will only take 10 minutes to 4 hours or more (10 minutes is the average confirmation time of every block to mine).

But it will consume your time waiting, particularly if you urgently need the product or the service you want to purchase from that online store or marketplace.

To avoid that, you should set a higher TX fee or transaction fee for the BTC transaction you're going to make.

How Bitcoin Transactions Get Confirmed

Bitcoin miners process transactions in the network, which they file the transactions you made into blocks and add those blocks to the Blockchain, once your transaction is successfully mined, it will be confirmed as well.

Bitcoin miners use specialized software and hardware that solve mathematical problems and issue a specific number of bitcoins as a reward, which is called Bitcoin mining. This presents as an incentive for more people to mine.

These miners are operated by a group of people, organizations, companies, etc., who want to make a profit by investing their money in purchasing equipment and paying for electricity.

Miners actually work together in order to mine Bitcoin smoothly in a Mining Pool. Where they pool their resources together and split the reward equally according to the number of shares they contributed.

Now, if you have some unconfirmed transactions because you accidentally set the tx (transaction) fee to low or your wallet software has an error that causes the fee to be set as low, you need these miners on a mining pool to confirm your transaction eventually in the Blockchain network.

List of Free and Paid Bitcoin Transaction Accelerators

1. Viabtc

Viabtc is a mining pool that offers a free bitcoin accelerator for 100 fixed numbers of transactions per hour. They also have a paid accelerator if you want since there are limited numbers, they accept paid transaction accelerator which will be confirmed on the next block mined by viabtc. Viabtc only pushes a transaction that has a minimum fee of 0.0001 BTC/KB and/or ?0.5 KB, a lower fee will be ignored. Just a heads up, you can try to accelerate on viabtc and check the time if it's hour:59:59 (hour:minutes:seconds), coz it always resets once the clock is set to hour:00. Check your clock, then hit the "Submit FREE" button to include your transaction to the next block viabtc mined.

2. Binance.com

Binance is the largest cryptocurrency exchange by volume. They also have their mining Pool, which is used to accelerate Bitcoin transactions together with their other Mining Pool partners. This is a paid one, you need to have an account there first before you can use their service

3. Mempool.space

Mempool.space a website that provides information and visualizations related to the Bitcoin mempool. It has is a paid service. They are partnered with Foundry Mining Pool to accelerate unconfirmed transactions. You need to have an account there first in order to use their service.

Please be aware of some services that want to deceive people, pretending they can accelerate your unconfirmed transaction, for which they charge a fee. These "claimed" Bitcoin accelerators are just "broadcasting your transactions" to the network.  As of the moment, these lists are the only legit Bitcoin transaction accelerators. 

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