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Understanding what are gas fees and why network costs spike
The finding
Gas fees represent the market price for block space, where a simple transfer consumes 21,000 gas units and complex smart contracts consume over 100,000 units.
Base fees adjust automatically by up to 12.5% per block based on target capacity.
Priority fees act as an auction bid to secure execution priority from block builders.
Traders moving collateral between venues often ask what are gas fees when transfer costs jump unexpectedly during liquidations. Understanding what are gas fees requires breaking down a transaction into units of computational effort multiplied by the price per unit at execution time.
Network fees do not depend on the dollar value of the transfer. Sending one million dollars worth of Bitcoin or Ethereum consumes the exact same computational resources as sending ten dollars. The fee changes based on network utilization and contract complexity.
Base fee against priority fee mechanics
Modern blockchain fee markets split execution costs into two distinct components: the base fee and the priority fee. The base fee is the minimum price required for inclusion in a block. The network calculates this value automatically based on the fullness of the preceding block.
When a block exceeds its target gas capacity, the base fee increases for the next block by up to 12.5%. If blocks remain fully saturated, fee growth compounds rapidly across consecutive blocks.
Worth knowing
Base fees are destroyed by the network upon execution, while priority fees are paid directly to block validators to incentivize order flow selection.
Consider an Ethereum transfer consuming 21,000 gas units when the base fee starts at 20 gwei and the priority fee is set to 2 gwei. The total price is 22 gwei per unit, yielding a execution fee of 462,000 gwei, or 0.000462 ETH.
If ten consecutive blocks land at 100% capacity, the base fee escalates from 20.00 gwei to 57.72 gwei. The identical 21,000 gas transfer now costs 1,254,120 gwei, or 0.001254 ETH, purely due to network saturation over a two-minute window.
`` Block 1 Base Fee: 20.00 gwei Block 2 Base Fee: 22.50 gwei (+12.5%) Block 3 Base Fee: 25.31 gwei (+12.5%) Block 4 Base Fee: 28.47 gwei (+12.5%) Block 5 Base Fee: 32.03 gwei (+12.5%) ... Block 10 Base Fee: 57.72 gwei (+12.5%) ``
How chain architecture determines what are gas fees
Different blockchain architectures assign different gas values to equivalent operations. Simple account-to-account transfers require minimal state updates. Interacting with perpetual futures smart contracts, vault deposits, or multi-sig wallets requires reading and writing multiple memory slots, driving up total gas units.
When moving funds between centralized derivative venues, network gas fees dictate withdrawal costs, while venue fee schedules dictate execution costs once landed.
| Exchange | Futures Maker Fee | Futures Taker Fee | Live ETH Funding Rate (8h) | Live BTC Funding Rate (8h) | 24h Futures Volume |
|---|---|---|---|---|---|
| Bitget | 0.0200% | 0.0300% | +0.0051% | +0.0069% | $4,967,477,803 |
| MEXC | 0.0000% | 0.0200% | +0.0082% | +0.0047% | $4,795,611,060 |
| OKX | 0.0200% | 0.0500% | +0.0091% | +0.0100% | $4,795,611,060 |
| Bybit | 0.0200% | 0.0550% | +0.0100% | +0.0100% | $4,967,477,803 |
Holding a long position on ETH yields an 8-hour funding spread of 0.0049 percentage points between Bitget (+0.0051%) and Bybit (+0.0100%). Moving margin collateral on-chain to rebalance across these venues costs gas fees that must be weighed against this funding variance.
Why stuck transactions are underpriced, not lost
A transaction remains unconfirmed in the mempool when its max priority fee falls below the current market clearing rate. Validators order incoming transactions by priority fee per gas unit to maximize block rewards.
Transactions use sequential account nonces. If nonce 12 carries a priority fee of 1 gwei while market conditions shift to require 15 gwei, nonce 12 stalls in the mempool. All subsequent transactions from that account (nonce 13, 14, 15) remain blocked behind it regardless of their fee settings.
Where this goes wrong
Leaving a low-fee transaction pending during rapid liquidations can lock your wallet nonces, preventing critical collateral top-ups until overridden.
To clear a stuck transaction, re-broadcast a replacement transaction using the exact same nonce, increasing the priority fee by at least 10% to 20% over current market requirements. Wallet software will overwrite the stalled entry in node memory pools.
Reading a fee estimator instead of accepting defaults
Default wallet software uses trailing averages to suggest network fees. During sudden volatility spikes, trailing averages lag behind real-time block space demand, leading to underpriced transactions that stall precisely when execution speed matters most.
| Market Condition | Base Fee Trend | Recommended Priority Fee Strategy | Risk of Stuck Transaction |
|---|---|---|---|
| Stable Market | Flat or decaying | Standard default priority fee (1-2 gwei) | Low |
| Moderate Volatility | Stepwise increases | High bucket estimator setting (+20% buffer) | Medium |
| Liquidation Cascade | Exponential compounding | Aggressive priority fee bidding above current block top percentile | High |
What to do instead
Check current pending block base fees and top-percentile priority bids on an active gas tracker before broadcasting time-sensitive margin deposits.
Setting a high max fee cap protects against unexpected base fee spikes without overpaying. The network refunds the unspent portion of the maximum base fee allowance, charging only the actual base fee burnt by the block builder plus the priority tip.
What determines the total gas fee of a transaction?
Total gas fee is calculated by multiplying the units of gas consumed by the sum of the network base fee and validator priority fee. Simple balance transfers consume fewer gas units than complex smart contract interactions.
Why do gas fees increase rapidly during market sell-offs?
High trading activity creates intense competition for block space as traders move collateral and execute arbitrage transfers simultaneously. Block saturation triggers compounding 12.5% base fee increases per block while users submit higher priority fees to skip the queue.
Will a stuck crypto transaction eventually cancel itself?
Transactions do not automatically expire on-chain, but nodes drop underpriced transactions from their local mempools if unconfirmed after several days. You can cancel it manually by broadcasting a zero-value transaction using the same nonce with a higher priority fee.
Is the unspent portion of a gas fee refunded?
Yes, setting a high maximum fee cap does not mean you will spend that full amount. The network only deducts the mandatory base fee plus your priority tip, returning any unused maximum fee allowance back to your account balance.