What is a gas fee in crypto and how do commissions work?

Imagine the typical image of a beginner in the crypto world who hesitated for a long time and finally decided to start investing in crypto.

And then day “X” arrives: he is sitting in front of a flickering monitor, intending to make his “deal of the century” — sending a couple dozen USDT into promising coins. His fingers confidently press the “Send” button, his heart beats pleasantly in anticipation of future profits... and suddenly it appears on the screen… red like an alarm signal at a villain’s secret base, a window sternly asks:

Well, of course, it will say something slightly different, but the essence is almost the same — to complete the transaction, you need to pay an amount almost equal to, or only slightly less than, what he planned to invest.

• What is this: the tricks of unknown cybercriminals or the scams of digital fraudsters?
• Who is this invisible extortionist rummaging through our digital pockets?

You can blame anyone you like: from the Freemasons to a secret conspiracy of miners, but the name of the real suspect has long been known. It is the gas fee.

Yes, yes, in the crypto world, just like in the regular one, everything has to be paid for. Even more so, because literally every “sneeze” on the blockchain requires paying a network fee or gas fee.

The thing is, a decentralized network is not a magical cloud where everything happens for free by the power of thought. It is a huge enterprise with thousands of computers that check every transaction, execute smart contracts and seal data into the blockchain.

In this article, we will figure out once and for all what a gas fee is, what rules gas fees in cryptocurrency follow, how gas differs from a regular network fee, why gas costs constantly jump around and, most importantly, how you can save on them so you can get out of this “digital shootout” without extra holes in your own wallet.

Key Takeaways

• A gas fee is a payment for computational work on the blockchain, not a universal term for all crypto fees. In Ethereum and EVM networks, it is “gas”; in Solana or Bitcoin, it is more accurately called a “transaction fee” or “network fee”.
• The cost of gas depends on network congestion: the more people want to make a transaction at the same time, the more expensive space in a block becomes.
• Fees differ significantly between blockchains — from cents on Polygon or Solana to tens of dollars on Ethereum during periods of congestion.
• Reducing gas costs is possible: choose less congested hours, move to Layer 2 and combine operations.
• It is almost impossible to avoid network fees completely, although gasless solutions exist where the app or protocol covers the fee.

Brief AI Summary:

What is a gas fee in cryptocurrency?

To put it very simply: a gas fee is the payment for processing a transaction on the blockchain. It is needed not only for regular transfers, but also for any interaction with smart contracts. You can compare it to a delivery fee in an online store: the product costs one amount, while logistics and order processing are paid for separately.

Here it is important not to confuse several different concepts that beginners often lump together:

• transaction amount — how much you are actually transferring;
• network fee — the payment for having the transaction processed on the blockchain at all;
• gas fee — the specific mechanism for calculating this fee in Ethereum and EVM networks;
• platform or service fee — what an exchange, wallet or DEX charges separately from the network.

And here is a nuance few people talk about: gas fee is not a universal name for every crypto fee. In Ethereum and EVM-compatible networks in general (Polygon, BNB Chain, Arbitrum), the term “gas” is indeed fundamental and technically correct. But in Solana, Bitcoin, Stellar or GRAM, it is more accurate to say “transaction fee” or simply “network fee”.

What is gas in cryptocurrency?

Gas is a unit of measurement for computational work on the blockchain. The more complex the operation, the more gas it “eats”. A simple transfer of a network’s native coin, for example ETH, usually costs less than interacting with a smart contract.

Here are examples of operations that consume gas:

• sending ETH to another user;
• swapping tokens on a DEX;
• creating (minting) an NFT;
• adding liquidity to a pool;
• claiming staking rewards;
• transferring assets through a blockchain bridge.

Each of these actions has its own “weight” in gas units — some simple operations require 21,000 units, while complex multi-calls to smart contracts can “eat” hundreds of thousands.

How do gas fees work?

The calculation mechanics look like this: the user creates a transaction, the wallet immediately shows an estimated fee, the network checks whether the request is valid, and validators (previously miners) include the transaction in a block.

The logic is simple: the higher the demand for space in a block right now, the more expensive that space becomes.

For Ethereum, the basic formula looks like this:

gas used × gas price = transaction fee

That is, the number of gas units spent by the operation multiplied by the price of one gas unit at that specific moment.

After the EIP-1559 update, the model became a little more complex — three components appeared:

• base fee — the base fee set by the network itself depending on congestion, which is then burned;
• priority fee (tip) — a “tip” to the validator so they process your transaction faster;
• gas limit — the maximum amount of gas you are willing to spend on an operation: insurance against an error in contract code draining your wallet.

We will not dive deeper into the technical weeds — for everyday use, understanding these three concepts is enough.

Why do gas fees in cryptocurrency change?

A blockchain fee is not a fixed price on a price list, but something like a real-time auction.

A whole bunch of factors affects it:

• network congestion at a specific minute;
• the number of transactions waiting to be processed;
• the complexity of your specific operation;
• the architecture of the blockchain itself;
• the motivation of validators or miners to process your request specifically;
• overall market activity — when the crypto market is “boiling”, network load also rises.

Certain events can also send fees sky-high: a mass mint of a popular NFT collection, hype around some new DeFi protocol, the launch of another memecoin or mass airdrops. Remember the stories about $100+ Ethereum transactions during the peak of the NFT boom? That is exactly what this is.

What is Gwei?

Gwei is the unit of measurement for the price of gas on the Ethereum network. 1 Gwei equals 0.000000001 ETH. You might wonder: why invent a separate unit, why not just count in ETH? Because the values would be so tiny, with so many zeros after the decimal point, that even an experienced developer would find them inconvenient to navigate.

A simple example: if the gas price is 20 Gwei and the operation itself uses the standard 21,000 gas (a classic ETH transfer), the final fee is calculated as the product of these two values — but this is not exact: you should always check the exact amount directly in your wallet before confirming the transaction, because the gas price changes literally every minute.

Gas fees across different blockchains: Ethereum, Polygon, Solana and other networks

Different blockchains approach fees in their own way, and the difference can be enormous.

Gas fee in Ethereum

Ethereum is, in fact, the birthplace of the term gas fee. It is the oldest and busiest network among smart contract platforms, so fees here have historically been the highest and most volatile.

During periods of low congestion, a transfer can cost tens of cents; under medium load, a dollar or two; and during hype periods, amounts grow many times over, which has repeatedly become a headache for ordinary users.

Gas fees in Polygon

Polygon is essentially the same Ethereum in terms of architecture (an EVM-compatible network), but significantly cheaper for everyday use. It is used for DeFi, NFTs, payments and most Web3 applications in general, where speed and low transaction cost matter.

A regular transfer of the native POL (MATIC) token is about $0.001; a token swap (QuickSwap/Uniswap swap) is about $0.005; minting/buying an NFT or executing complex smart contracts is about $0.02.

Transaction fees in Solana

Here it is worth making a clarification: Solana uses a completely different architecture, and calling it a “blockchain with gas fees” is not entirely technically correct. It is more accurate to talk about “transaction fees” — they are usually very low, literally fractions of a cent (from $0.0001 to $0.0005), thanks to a different approach to processing and confirming operations.

Gas fees in Layer 2 networks

Layer 2 solutions — Arbitrum, Optimism, Base, zkSync — reduce transaction costs by processing operations outside the main Ethereum network and only periodically “reporting” back to it. This allows users to get Ethereum security while paying significantly less for each action on the network — approximately from $0.001 to $0.005.

The size of gas fees in cryptocurrency

Let’s be honest right away: giving fixed numbers “forever” is a bad idea because gas costs change almost in real time. Still, an approximate picture can be shown:

These numbers are a guideline, not an exact price list, and they should be checked at the moment of the transaction through a gas tracker or directly in your wallet.

Why are gas fees so high?

The main reasons why sometimes you have to pay an amount comparable to a restaurant lunch for a simple transaction:

• the network is physically overloaded, and everyone is competing for a limited amount of space in the block;
• smart contract operations require much more computation than simple transfers;
• popular events — drops, listings, NFT sales — create short-term but powerful spikes in demand;
• the architecture of some networks is simply not designed for high throughput.

How to reduce gas fees?

This is probably the most practical section of the article, so here are specific tips:

• make transactions during periods of low network load — often at night by UTC or on weekends;
• move to Layer 2 solutions where possible;
• choose networks with lower fees for operations where it makes sense: not all assets “live” only on Ethereum;
• combine several actions into one transaction if the app allows it;
• avoid urgent operations with an increased priority fee unless there is a real need;
• check gas trackers before sending — it takes a minute and saves nerves;
• use wallets and services that show the fee in advance, before confirming the transaction. Many modern apps, including Trustee Wallet, immediately display the estimated cost of the operation, so you see the full picture before clicking “confirm” — this is especially convenient when working with several networks at the same time and wanting to compare costs;
• explore gasless transactions and sponsored transaction options if the specific app supports them.

Can gas fees and network fees be avoided completely?

The honest answer is that in the vast majority of blockchains, you cannot fully avoid a network fee. Sometimes it is simply “hidden” inside a service or covered by the app itself, and the user does not see it directly, but that does not mean it does not exist.

Gasless transactions do exist — they are implemented through meta-transactions, account abstraction, relayers or protocols such as Gas Station Network / OpenGSN. But the law of conservation of money applies here: someone still pays the real cost of computation, just not the end user directly, but the app developer or the protocol.

Which blockchain has the lowest network fees?

To quickly run through the candidates: Solana, Polygon and BNB Chain traditionally stay in the lower price segment. Tron deserves a separate mention — if TRX is staked for “Energy”, fees there can be almost zero, but the staking mechanics change periodically, so it is better to check the current network documentation. Stellar and TON are also known for low fees, and Layer 2 networks are worth keeping an eye on separately — their prices often compete with the cheapest L1s.

Fees and smart contracts

Why is interacting with a smart contract almost always more expensive than a simple transfer? Because it is, in essence, a completely different amount of work for the network.

Examples of operations that traditionally “eat” more gas:

• swapping tokens through a DEX;
• adding liquidity to a pool;
• minting an NFT;
• transferring assets through a blockchain bridge;
• staking;
• claiming staking or farming rewards.

The logic is simple: the operation requires more computation, the contract often calls other contracts inside itself (for example, a DEX refers to a liquidity pool, and that pool refers to a price oracle), and the more complex this chain logic is, the more gas it consumes.

Common beginner mistakes when working with gas fees

Over the years of working with crypto, a whole list of rakes has accumulated — and almost every beginner steps on them:

• not leaving the network’s native token specifically to pay the fee: for example, wanting to send USDT on the Ethereum network while having no ETH in the wallet at all;
• confusing the gas fee with the amount of the transfer itself;
• sending a transaction during peak network congestion, even though they could have waited a few hours;
• not checking which exact network the transfer is happening on;
• using an expensive blockchain for a small amount — in that case, the fee can “eat” half of the transfer;
• not accounting for fees in advance when planning DeFi operations;
• trying to send an ERC-20 token while having zero ETH in the balance to pay for gas.

Is a gas fee the same as an exchange fee?

No, and confusion here happens all the time. Let’s break down the difference:

• gas fee — the blockchain’s own fee for processing a transaction;
• exchange fee — the fee charged by an exchange or service for carrying out an operation;
• withdrawal fee — a separate fee for withdrawing funds from a platform;
• spread — the difference between the buying and selling price of an asset;
• service fee — the fee charged by a specific app or service for convenience.

Final thoughts

Remember that beginner from the start of our article who stared wide-eyed at the red window offering to “give up a kidney” for a transaction? We hope that after reading this article, such questions will not trouble you or your friends.

Yes, sometimes the amounts on the bill really bite — especially if you decide to conquer Ethereum during another wave of crazy hype. But now that you have solved this “gas case”, learned what the fee consists of and what rules it follows as it changes, this invisible extortionist will no longer be able to catch you off guard.

Final guidelines and tips for a confident start:

1. Do not panic when you see high numbers. If the network demands too much, it is not a sentence; it is just a reason to click “Cancel” and wait for a calmer time, such as the weekend or deep at night.
2. Choose the right network for the task. To send $20 to a neighbor, you do not have to use “expensive” Ethereum L1. Move to Layer 2 (Arbitrum, Base, Optimism) or fast L1s such as Solana or Polygon, where fees are measured in fractions of a cent.
3. Always keep some “native coin” in reserve. Remember the main rule of the Web3 jungle: to send tokens (USDT, USDC or any others), your wallet must contain a small amount of the native fuel of that network (ETH, POL, SOL or TRX) to pay for gas.
4. Do not manually save on limits. A Gas Limit that is too low will not save you money; it will only burn it for nothing because of an Out of Gas error.

Now you stop being just an observer and start managing your expenses yourself. Press the “Send” button confidently, choose the right moment — and may your gas always be cheap and your transactions instant!

FAQ

What is a gas fee in cryptocurrency?

It is the fee for processing a transaction or executing a smart contract on the blockchain.

What is gas in cryptocurrency?

Gas is a unit of measurement for the computational work required to execute an operation on the network.

How do gas fees work?

Through validators or miners: they include the transaction in a block, and the fee size depends on the gas used and the current gas price on the network.

Why are gas fees so high?

The network is congested, users compete for limited space in a block, and smart contract operations require more computing resources.

How much do gas fees cost in cryptocurrency?

It depends on the specific network, its load, the type of operation and the selected transaction speed — there is simply no fixed price.

Can crypto fees be avoided?

Completely — usually not, but they can realistically be reduced or replaced with gasless / sponsored solutions if the app supports them.

What is Gwei?

A unit of measurement for the price of gas on the Ethereum network.

Which cryptocurrency has the lowest fees?

It depends on the network and type of operation, but Solana, Polygon, Tron and Layer 2 networks are traditionally known for low fees.

Are gas fees refunded?

For the most part, no, not fully. If a transaction fails, the network still charges gas for the computations already performed, but unused remaining gas is usually returned to the user.

Why do you need ETH specifically to send tokens?

In Ethereum and other EVM-compatible networks, gas is always paid in the network’s native token, even if you are sending a completely different token, such as an ERC-20.