The sender of the transaction (or their wallet software) chooses what transaction fee they will pay for the transaction.

The solo-miner or mining pool (or their mining software) decides if they want to include the transaction in their block or not.

By choosing a larger fee, the sender creates a larger incentive for the miner or pool to choose to include their transaction.  If the transaction has not yet been included in a block, it might be possible to resend the transaction with a higher (or lower) transaction fee, however there is no guarantee that the miner or pool won't still choose the earlier transaction without the changed fee.  Use of the RBF (Replace By Fee) feature in Bitcoin transactions can make it easier to increase the fee before the transaction is included in a block, and increase the likelihood that the miners and pools will see and include the new transaction with the larger fee.

You are registered here for almost 1 year but you don't know if the transaction fee is fixed or not?

What actually wallet are you always using?
Have you heard about Electrum, wasabi, or Bitcoin core?
Have you tried to use them?


If not, I'd like to suggest that you try Electrum or wasabi you can able to set the miners fee any amount you want. It's not the same as exchange wallets like Coinbase or Binance that have fixed transaction fees or any custodial wallet.

Here's what it looks like in Electrum when you are manually set the fee

Under "target fee" that is where you can edit how much sat/byte you want to pay and also take note of the size of the transaction.

Bitcoin transaction fee are always volatile which will be adjusted to the condition of the mempool. If the mempool is congested then you may be advised to use a higher transaction fee if you want to get confirmation faster. You can still use a lower transaction fee than the recommendation fee if you are patient enough to wait for your transaction to be put in the block, but when the network congested, it may take you a while to get that confirmation even it can be longer than 24 hours. Just wanted to share my experience, I usually use the transaction fee suggested by the two sites (Mempool.space & Blockchair.com). Make sure you also enable RBF to anticipate network congestion because this feature allows you to increase transaction fee before confirmation.

This is too hash buddy, spending a year on the forum is not a prerequisite to know everything about Bitcoin. I have been studying about different things this caught my attention I needed clearity

I have been restricted to trust wallet for a long time  and haven't seen an option as such where you can set the miners fee and while studying I came across setting your transaction fee on the network so I came up with the thread

Thank you

I did actually have the same questions too on where this is just a basic thing and its impossible for a member of this forum for 1 year isn't aware on how fee works?

He should really know on using those non-custodial wallets for him at least does have the idea on how to set out specific fees on specific market conditions.

Electrum would be a good wallet to make things a bit familiarizations on things at least for him to know on how fee works.

No it is not fixed. If you say that the fee is a fixed fee, then it’s going to be a particular that you’re going to be paying anytime you’re doing a transaction. But it is not like that, rather you’re always paying different fees whenever you are doing a transaction with your wallet; if you’re paying $10 today for the transaction you’re doing, tomorrow or even the next minute, you’re not going to be paying that same $10, it will change $1 or any other thing. The price is determined by what people are ready to pay at that time and how busy or congested the network is at the time you’re doing the transaction.

Transaction fees are determined by the market. Miners can process whatever transactions they want, but it is obviously the most beneficial to include the highest fee per byte transactions as the space is limited in each block. This is a great incentive system that they say cures some problem with some generals or something. (Kidding, but look it up and appreciate greatness.)

That will continue to change even on exchanges though, the first time I entered the cryptocurrency it was only about 10k satoshi up to 100k satoshi. And now with a different range. There may be $10 in bitcoin like kraken.

Fixed? No mate it depends what amount of transactions you have, but you can set it to higher if you want a fast transaction, if not you can set it to a lower fee but probably it takes hours or days. "For short bitcoin fees is depends on the speed of your transaction". And you know there's a chance as well that your transaction will be cancelled or stop if you exceed to the lowest value.. So remember to double check it always to don't waste your time waiting for your transaction to be confirmed by miners..