What Is Gas Fee in Cryptocurrency? And Why Is It Sometimes Insanely Expensive?
Gas fees are the "service fees" you pay to network validators whenever you perform any operation on a blockchain — essentially a transaction cost. The core reasons why they can become insanely expensive are just two:limited blockchain processing capacityandtoo many people using it at the same time, leading to a bidding war. However,the "insanely expensive" situation has fundamentally changed by 2026, especially for Ethereum, where fees have dropped significantly.
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First, Understand What Gas Fee Really Is
Think of a blockchain as a highway, validators as toll booths, and gas fees as the toll. Every transaction (sending tokens, swapping coins, buying an NFT) consumes computational resources on the chain, just like a car burns fuel — that's where the term "gas" comes from.
Gas fees are not fixed; they are determined by two factors:
Base fee: The network automatically sets a floor price, adjusting in real-time based on congestion. It rises when traffic is heavy and drops when it's light.
Tip (priority fee): An extra amount you voluntarily pay to validators as an "express fee." The more you tip, the faster your transaction gets included.
When you initiate a transaction in your wallet, it usually offers three options: Slow (cheap), Standard (normal), and Fast (expensive). Which one you choose depends on how urgent your transaction is.
Why Was It "Insanely Expensive" Before?
Before 2024, a simple transfer on the Ethereum mainnet could easily cost tens of dollars. The reasons were straightforward:
Narrow road, heavy traffic: Ethereum could only process about 15-30 transactions per second. When a hot NFT sale or a meme coin frenzy hit, transaction volume exploded instantly, block space became scarce, and gas fees naturally skyrocketed.
Bidding war: Everyone wanted their transaction to go through quickly, so they kept outbidding each other, triggering a "gas war" that pushed fees to irrational levels.
ETH price appreciation: Gas fees are paid in ETH. When the price of ETH rose, the same amount of gas became more expensive in dollar terms.
The 2026 Reality: Gas Fees Are No Longer a Major Problem
This situation has completely changed by 2026.
Ethereum underwent several key upgrades between 2024 and 2025 (Dencun, Pectra, Fusaka), with the core idea being to divert most high-frequency transactions from the congested main road (Layer 1) to elevated expressways (Layer 2).
Actual fee levels in July 2026:
| Operation | Ethereum Mainnet Fee | Layer 2 Fee |
|---|---|---|
| Regular ETH transfer | Approximately$0.01 - $0.03 | Approximately$0.001 |
| ERC-20 token transfer | Approximately$0.05 - $0.08 | Approximately$0.005 |
| DEX swap (e.g., Uniswap) | Approximately$0.20 - $0.30 | Approximately$0.01 |
| NFT minting | Approximately$1.4 - $5 | Approximately$0.02 |
The above data is based on typical conditions from April to May 2026, with Ethereum gas around 0.15-0.5 Gwei and ETH price around $2,350. Actual fees may vary; always check real-time data on your wallet or block explorer.
As you can see, even on the mainnet, a transfer costs just a few cents, and on Layer 2, fees are negligible. The Ethereum Foundation blog has also confirmed this shift: "The mainnet is cheap again."
When Can Gas Fees Still Become High?
Although overall fees are low, gas can still spike temporarily in the following scenarios:
During extreme market volatility: When prices surge or crash, on-chain transaction volume can suddenly increase.
During popular project launches: A highly anticipated NFT or new token launch can still trigger short-lived "gas wars."
When the Bitcoin network is congested: Bitcoin's gas fees (also called miner fees) work similarly and can rise during congestion. If you need to send BTC, it's also advisable to avoid peak hours.
Practical Tips: How to Avoid High Gas Fees
Even though fees are already low, if you want to save even more, here's what you can do:
Use Layer 2: If your wallet supports it, try to operate on Layer 2 networks like Arbitrum, Optimism, or Base. Fees can be over 90% cheaper than on the Ethereum mainnet.
Avoid peak hours: The busiest times are usually from 8 PM to 2 AM Beijing time (UTC 12:00-18:00) from Tuesday to Thursday. Operating on weekends or in the early morning Beijing time may result in lower fees.
Check real-time gas prices: Before sending a transaction, your wallet usually displays the current gas price. If you see Gwei spike suddenly, wait a few minutes and try again.
Batch operations: If you need to make multiple transfers, try to combine them into one transaction to save on the fixed costs of multiple transactions.
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Verification: How to Know If Your Gas Fee Is Reasonable
Check a block explorer: On Etherscan (for Ethereum) or BscScan (for BSC), enter your transaction hash (TxID) to see the actual gas used and the gas price paid.
Compare with wallet suggestions: The "Standard" rate recommended by your wallet is usually the current normal level. If you choose "Fast," the fee will be higher, but the transaction will be confirmed faster.
Monitor real-time Gwei: When the network is idle, Ethereum's gas price can be below 1 Gwei. If you see it exceed 10 Gwei, it means the network is busy, and you may want to wait if your transaction is not urgent.
