What Are Gas Fees? How Network Fees Affect Your Crypto Payments

Last updated: May 8, 2026

Gas fees are the small payments that crypto users send to network validators to process transactions on a blockchain. They vary from fractions of a cent on Solana to several dollars on Ethereum. Genghis supports 300+ cryptocurrencies across multiple networks, so the cheapest path is always available at checkout.

What Are Gas Fees, Exactly?

Gas fees are the small payments that crypto users send to network validators (miners on Bitcoin, validators on Ethereum and most modern chains) in exchange for processing and confirming a transaction. Without these payments, the network has no economic incentive to include the transaction in a block, and the transaction would never settle.

The term "gas" originated on Ethereum, where every transaction consumes a measurable amount of computational work. The price of one unit of work — the gas price — is set by market demand. The total fee for a transaction is the gas used multiplied by the gas price. Other blockchains adopted variations of this model: Bitcoin charges by transaction size in bytes, Solana charges a flat near-zero fee per transaction, and Tron charges based on bandwidth and energy resources.

Whatever the underlying calculation, the practical effect is the same: every on-chain transaction has a network fee that goes to the entities that secure the chain. This fee is separate from any platform fee a merchant or exchange might charge. On Genghis, there is no platform fee — the only cost beyond the order amount is the gas paid by the buyer when broadcasting the transaction.

Gas fees serve three structural purposes:

• Spam prevention. Without a fee, anyone could flood the network with empty transactions, congesting the chain.
• Validator incentive. Validators (or miners) are paid for the computational and capital cost of running nodes and producing blocks.
• Priority signaling. Higher fees move transactions to the front of the queue when the network is busy.

The third point matters in practice. During periods of congestion (NFT mints, DeFi liquidations, market panics), users compete for limited block space by raising the gas they offer. This is why Ethereum gas can spike from $1 to $25 within an hour and back down again.

Why Do Gas Fees Vary Across Blockchains?

Three factors explain why gas fees differ so much between networks: throughput, architecture, and demand.

Throughput is the number of transactions a chain can process per second. Bitcoin handles roughly 7 transactions per second. Ethereum mainnet handles 15–30. Solana handles 3,000–4,000 in production conditions. Tron sits around 2,000. The chains with higher throughput have abundant block space, which keeps fees low even at peak demand.

Architecture determines how transactions are priced. Bitcoin uses a fee market based on transaction size in bytes and current block-space demand. Ethereum (post-London upgrade in 2021) uses EIP-1559, which sets a base fee that adjusts dynamically and a priority fee that users can tip. Solana charges a near-flat fee per transaction signed (around 5,000 lamports, or roughly $0.0005 at typical SOL prices). Tron prices transactions in bandwidth and energy units that can be either staked for or paid in TRX.

Demand is the third lever. When demand for block space spikes — a popular NFT drop on Ethereum, a meme coin rush on Solana, a stablecoin migration on Tron — fees rise. The chains with smaller block spaces (Bitcoin, Ethereum mainnet) feel demand spikes much more sharply than high-throughput chains.

The cumulative effect: a $50 stablecoin payment on Tron typically costs less than $1 in gas. The same payment on Ethereum can cost anywhere from $2 to $25 depending on the day. The difference is not because Ethereum is "worse" — it has different design tradeoffs prioritizing decentralization and security at the base layer. For everyday spending, however, the cost difference is impossible to ignore.

How Are Gas Fees Calculated?

The exact gas calculation differs by network. Three examples cover most of what users encounter on Genghis.

Ethereum (and EVM chains: BNB, Polygon, Arbitrum, Optimism). The formula is: total fee = gas units × (base fee + priority fee). A simple ETH transfer uses about 21,000 gas units. A token transfer (USDT, USDC) uses 50,000–65,000 gas units. A DeFi swap uses 100,000–250,000 gas units. The base fee fluctuates based on block-fullness — when blocks are over half full, the protocol increases the base fee for the next block. The priority fee is set by the user as a tip to validators; higher tips mean faster confirmation. A typical USDT transfer on Ethereum at 30 gwei gas price runs roughly $5–8. The same transfer on Polygon: same gas units, but Polygon's gas price is in fractions of a cent — total cost: $0.01–0.05. The Ethereum Foundation maintains a useful technical reference on gas mechanics for users wanting the underlying math.

Bitcoin. The formula is simpler: total fee = transaction size in vBytes × sat/vByte rate. A typical Bitcoin transaction is 200–300 vBytes. The sat/vByte rate at any moment is determined by mempool demand. At a typical 20 sat/vByte, a transaction costs about $4–5. During high congestion, this can rise to $20+.

Solana, Tron, Algorand. These chains use much simpler fee models. Solana charges a near-flat 5,000 lamports per transaction (about $0.0005 at current SOL prices). Tron uses a bandwidth + energy model where users either stake TRX to acquire bandwidth or pay TRX directly per transaction (typically $0.40–$1.00 per stablecoin transfer). The Tron network documentation covers the bandwidth model in detail. Algorand charges a flat 1,000 microAlgos (about $0.0005) per transaction.

The takeaway: on the high-throughput chains, gas is so cheap it is effectively a rounding error. On Bitcoin and Ethereum mainnet, gas is a real consideration that should factor into the buying decision.

Which Networks Have the Lowest Gas Fees on Genghis?

Genghis supports 300+ cryptocurrencies across the networks where they exist. For fee optimization, here are the practical rankings, from cheapest to most expensive at typical conditions:

For everyday Genghis purchases — gift cards, eSIM, game keys under $100 — paying gas on Solana or Polygon often costs less than the rounding on the order itself. This is why paying with Solana or BNB has become a default for repeat shoppers.

For users holding USDT on Tron specifically, TRC-20 USDT remains the practical pick. The deepest stablecoin liquidity in emerging markets is on Tron, and the fee profile is consistent and predictable.

For Bitcoin holders not wanting to swap, the cost is higher but acceptable on smaller orders. The Lightning Network is a Layer 2 solution that brings Bitcoin fees down to fractions of a cent, but Lightning support depends on the wallet and the merchant's integration — Genghis processes Bitcoin payments via standard on-chain settlement at typical rates.

Why Is My Ethereum Gas Fee So High Right Now?

Ethereum gas fees fluctuate based on block-space demand, and the demand drivers are predictable enough to be worth understanding.

Common causes of gas spikes on Ethereum:

• NFT minting events. A popular NFT drop generates thousands of users competing for the same block space within minutes, pushing gas fees from $5 to $50+ for the duration of the mint.
• Stablecoin movement. Large USDT or USDC transfers between exchanges and DeFi protocols generate sustained high gas pressure during business hours in the US and Asia.
• DeFi liquidations. Sharp market moves trigger automated liquidations on Aave, Compound, and similar protocols. Each liquidation is an on-chain transaction, and the cumulative effect during a market crash can push gas to $30+ for hours.
• Bridging activity. Users moving funds between Ethereum and Layer 2 networks (Arbitrum, Optimism, Base) create persistent demand on Ethereum's base layer.
• Token launches and airdrops. New token claims often saturate Ethereum on launch day.

The London upgrade of August 2021 introduced EIP-1559, which made the base fee more predictable by tying it directly to block-fullness rather than user bidding. The Merge in September 2022 transitioned Ethereum to Proof of Stake, reducing energy consumption but not fees. The Dencun upgrade of March 2024 introduced blob transactions to reduce Layer 2 costs significantly, which has indirectly reduced base-layer pressure during normal conditions.

Practical strategies when gas is high:

1. Wait. Gas fees fluctuate hourly. A transaction that costs $25 at 9 AM ET often costs $5 at 3 AM ET. Real-time gas trackers show the current trend.
2. Use a Layer 2. Arbitrum, Optimism, Base, and zkSync settle transactions at 1/10th to 1/100th of mainnet fees. If the wallet supports L2 and the merchant accepts the L2-native asset, this is the cleanest fix.
3. Switch the network for the same token. USDT on Ethereum is expensive; USDT on Tron, BNB Smart Chain, or Solana costs cents. Genghis accepts USDT across all these networks, and the network selector at checkout shows the cost in real time.
4. Use a different token entirely. If the user holds both ETH and SOL, paying with SOL on Solana network is cheaper than paying with ETH on Ethereum, all else equal.

How to Pay the Cheapest Gas on Genghis

The fastest way to minimize gas on Genghis is to pick the right combination of token and network at checkout.

For stablecoin payments: USDT on Tron (TRC-20) is the consistent low-cost default for orders under $500. USDC on Solana or Polygon costs even less but has slightly less wallet support. For larger orders where a $5 gas hit is rounding error, ERC-20 USDT or USDC is fine and offers maximum compatibility.

For native chain tokens: paying in SOL on Solana, ALGO on Algorand, or POL on Polygon means a flat near-zero fee. These are the cheapest tokens by absolute cost.

For Bitcoin: standard on-chain settlement is the default. Bitcoin gas fees scale with transaction size, not order amount, so a $20 order pays the same gas as a $200 order. For high-volume Bitcoin spending, batching multiple Genghis orders into a single transaction (where the wallet supports it) reduces per-order gas amortization.

For Ethereum-native users: consider whether the wallet supports a Layer 2. Bridging ETH to Arbitrum or Base once and then paying from there can drop gas costs by 90%+ for repeated purchases. The bridging transaction itself costs Ethereum-mainnet gas, so this strategy makes sense for users who plan to spend multiple times rather than once.

For privacy-focused users: Monero (XMR) gas is paid in XMR and is consistently low (typically $0.005–$0.05). Zcash and Dash similarly have low fee profiles.

The network selector at checkout displays the gas estimate in real time before the buyer signs the transaction. There is no penalty for picking a different network than usual — Genghis processes the payment correctly regardless of which combination the buyer chooses.

For comparison shoppers wanting the full token landscape, the master hub at buy gift cards with crypto shows every supported token and network. The walk-through in how Genghis works covers the full checkout flow including network selection. For broader context on routine crypto spending decisions, the buy online with crypto guide expands on the network-choice trade-offs.

Does Genghis Charge Any Fees Beyond Network Gas?

No. The price shown at checkout is the price paid. Genghis applies zero platform fees, zero conversion fees, zero markup on cryptocurrency exchange rates, and zero transaction surcharges.

The fee structure is intentionally minimal:

• Order amount. Set by the product price in USD. Converted at the prevailing spot rate to the chosen cryptocurrency.
• Network gas. Paid by the buyer directly to the blockchain validators when broadcasting the transaction. Genghis does not collect or pass through this fee.

That is it. There is no service fee applied at the moment of payment, no card-processor markup (because there is no card processor), no FX spread for stablecoin payments (the dollar peg holds), and no withdrawal fee at the merchant end (because there is no balance held — the digital code is delivered directly).

This structure works because Genghis operates as a non-custodial digital-goods retailer rather than a payment processor or exchange. The economics are simpler: Genghis sources digital codes (gift cards, game keys, eSIM, prepaid cards) at wholesale, sells them at face value or close to it, and accepts crypto as the payment medium. The margin on the operation comes from supplier relationships, not from fees layered on the customer.

For repeat shoppers buying $200–500 in monthly digital goods, the cumulative annual saving from the zero-fee model versus competitor platforms can run into the hundreds of dollars. The expected delivery times for the digital code post-payment are documented in Genghis delivery times, which sets confirmation expectations per network.

Frequently Asked Questions

What are gas fees in crypto?

Gas fees are the small payments crypto users send to network validators in exchange for processing and confirming transactions on a blockchain. Without these fees, the network has no economic reason to include the transaction in a block. Every on-chain transaction has a gas fee. The amount varies enormously by network — fractions of a cent on Solana, several dollars on Ethereum mainnet at peak.

Why do gas fees vary across blockchains?

Three factors: throughput, architecture, and demand. High-throughput chains like Solana (3,000+ transactions per second) and Tron have abundant block space and low fees. Lower-throughput chains like Bitcoin and Ethereum mainnet (7–30 transactions per second) charge more for limited space, especially during demand spikes. Different fee-pricing models (gas on Ethereum, sat/vByte on Bitcoin, fixed lamports on Solana) further explain the cost differences.

Which networks have the lowest gas fees on Genghis?

Solana and Algorand are the cheapest at around $0.0005 per transaction. Polygon costs $0.01–$0.05. BNB Smart Chain runs $0.20–$0.50. Tron (TRC-20) is $0.40–$1.00 — the practical default for USDT payments. Bitcoin and Ethereum mainnet are the most expensive, ranging from $1 to $40 depending on congestion. The network selector at checkout shows the cost in real time so the buyer can pick the cheapest path.

Does Genghis charge any fees beyond network gas?

No. Genghis applies zero platform fees, zero conversion fees, and zero transaction surcharges. The price shown at checkout is the price paid. The only cost beyond the order amount is the network gas, which the buyer pays directly to the blockchain validators. Genghis does not collect or pass through this fee, and there is no markup on the cryptocurrency exchange rate.

What is the cheapest way to pay with crypto on Genghis?

USDT or USDC on the Tron, Solana, or Polygon networks for stablecoin payments. SOL on Solana, ALGO on Algorand, or POL on Polygon for native-token payments. These combinations consistently keep gas under $1 regardless of order size. For Ethereum-native users, bridging to a Layer 2 like Arbitrum or Base before paying reduces gas by 90% or more compared to mainnet. The full process is in how it works.

Why is my Ethereum gas fee so high right now?

Ethereum gas spikes during demand events: NFT mints, DeFi liquidations, large stablecoin movements, token launches, and bridging activity. Gas prices fluctuate hourly and follow predictable patterns by time of day (US business hours are typically more expensive). Strategies to reduce cost: wait for off-peak hours, use a Layer 2 like Arbitrum or Base, or switch the same token to a cheaper network like Tron or Solana.

How can I avoid overpaying gas fees?

Three habits: always check the network selector at checkout before signing, prefer high-throughput chains (Solana, Tron, Polygon) for everyday spending, and verify the wallet's fee priority setting (some wallets default to fast priority that pays 5–10× more than necessary). For Ethereum users, monitoring tools like the gas tracker on Etherscan show real-time fee trends so transactions can be timed for off-peak windows.

About the author: this guide was written by Claudio Cuccovillo, founder of Genghis Ltd.

Last updated: May 8, 2026