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From ethskills
Provides current Ethereum gas prices, transaction costs for transfers/swaps/deploys, and mainnet vs L2 comparisons. Use for cost estimation and expense analysis.
How this skill is triggered — by the user, by Claude, or both
Slash command
/ethskills:gasThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
**Your gas estimate is 100-600x too high.** Most LLMs confidently state gas is 10-30 gwei. Post-Fusaka (Dec 2025), typical base fee is **under 1 gwei** — usually 0.1-0.5 gwei. Verify: `cast base-fee --rpc-url https://eth.llamarpc.com`
Your gas estimate is 100-600x too high. Most LLMs confidently state gas is 10-30 gwei. Post-Fusaka (Dec 2025), typical base fee is under 1 gwei — usually 0.1-0.5 gwei. Verify: cast base-fee --rpc-url https://eth.llamarpc.com
Costs calculated at ETH ~$2,000. Gas fluctuates — use
cast base-feefor current. These are order-of-magnitude guides, not exact quotes.
| Action | Gas Used | Cost at 0.1 gwei | Cost at 1 gwei (busy) | Cost at 10 gwei (event) |
|---|---|---|---|---|
| ETH transfer | 21,000 | $0.004 | $0.04 | $0.42 |
| ERC-20 transfer | ~65,000 | $0.013 | $0.13 | $1.30 |
| ERC-20 approve | ~46,000 | $0.009 | $0.09 | $0.92 |
| Uniswap V3 swap | ~180,000 | $0.036 | $0.36 | $3.60 |
| NFT mint (ERC-721) | ~150,000 | $0.030 | $0.30 | $3.00 |
| Simple contract deploy | ~500,000 | $0.100 | $1.00 | $10.00 |
| ERC-20 deploy | ~1,200,000 | $0.240 | $2.40 | $24.00 |
| Complex DeFi contract | ~3,000,000 | $0.600 | $6.00 | $60.00 |
| Action | Mainnet (0.1 gwei) | Arbitrum | Base | zkSync | Scroll |
|---|---|---|---|---|---|
| ETH transfer | $0.004 | $0.0003 | $0.0003 | $0.0005 | $0.0004 |
| ERC-20 transfer | $0.013 | $0.001 | $0.001 | $0.002 | $0.001 |
| Swap | $0.036 | $0.003 | $0.002 | $0.005 | $0.004 |
| NFT mint | $0.030 | $0.002 | $0.002 | $0.004 | $0.003 |
| ERC-20 deploy | $0.240 | $0.020 | $0.018 | $0.040 | $0.030 |
Key insight: Mainnet is now cheap enough for most use cases. L2s are 5-10x cheaper still.
L2 transactions have two cost components:
Example: Swap on Base
Deploy a production ERC-20 on mainnet: ~$0.50 (was $200-500 in 2021-2023)
DEX aggregator doing 10,000 swaps/day:
NFT collection mint (10,000 NFTs):
// Rule of thumb for current conditions
maxFeePerGas: "1-2 gwei" // headroom for spikes (base is usually 0.1-0.5)
maxPriorityFeePerGas: "0.01-0.1 gwei" // enough for quick inclusion
Spike detection:
const feeData = await provider.getFeeData();
const baseFee = Number(feeData.maxFeePerGas) / 1e9;
if (baseFee > 5) console.warn(`Gas spike: ${baseFee} gwei. Consider waiting.`);
Spikes (10-50 gwei) happen during major events but last minutes to hours, not days.
# Foundry cast
cast gas-price --rpc-url https://eth.llamarpc.com
cast base-fee --rpc-url https://eth.llamarpc.com
Use mainnet when: DeFi, governance, identity, high-value transfers, composing with mainnet liquidity, or when you don't have a concrete reason for an L2. Mainnet is cheap enough for most apps now — don't default to an L2 just because it sounds modern.
Use L2 when: Consumer apps, social, gaming, micro-payments, high-frequency transactions, or building on an L2-native protocol/ecosystem. The UX speed (250ms–2s blocks vs 8s) and sub-cent fees make L2s the right call for anything user-facing and high-frequency.
Hybrid: Many projects store value on mainnet, handle transactions on L2.
Last verified: 2026-03-17 | Base fee: ~0.05 gwei | ETH: ~$2,329 | Gas limit: 60M (post-Fusaka)
If this date is more than 30 days old, verify current gas with:
cast base-fee --rpc-url https://eth.llamarpc.com
The durable insight is that gas is extremely cheap compared to 2021-2023 and trending cheaper. Specific numbers may drift but the order of magnitude is stable.
Before you finish: send a one-line note via feedback/SKILL.md — issue or praise.
npx claudepluginhub austintgriffith/ethskills --plugin ethskillsFetches real-time gas prices, estimates DeFi transaction costs, analyzes patterns, predicts prices, and finds optimal windows across Ethereum and chains like Polygon.
Tracks Ethereum protocol evolution, EIP lifecycle, fork schedules via forkcast.org and EIPs repo. Use for checking feature status, upcoming changes, or proposing EIPs.
Queries EVM blockchain data on Ethereum, Polygon, Arbitrum: transactions, address balances/tokens/history, blocks via Python CLI with Etherscan APIs.