Gas optimizer
Find the cheapest gas right now: Base gas, Ethereum gas, Base fee estimate, and ETH price for USD conversion.
$0.10
per call · one payment for the whole workflow
POST /api/skill/gas-optimizer
3 tools run server-side in one request. You pay once, settle once, and get a single response - no orchestration, no per-step payments, and a partial-success envelope if any step fails. USDC over x402 on any supported chain.
When to use this pack
Timing a transaction - compare gas across chains and decide whether to act now or wait.
Tools in this pack
All 3 run inside the single $0.10 call above. Each is also callable on its own if you only need one part.
- Gas snapshot (slow / standard / fast) POST /api/gas-snapshot Live gas price snapshot for a chain - slow / standard / fast tiers in gwei, plus the latest base fee. Sampled from eth_feeHistory (last 4 blocks, 25th/50th/90th percentile priority fees). Use to estimate before broadcasting a transaction from another tool.
- Gas price GET /api/gas-estimate Current gas price (gwei and wei) on Base, Polygon, Arbitrum, Optimism, Ethereum, Monad, Celo, Avalanche, Sei, or Robinhood Chain - for an agent budgeting a transaction. Read-only. ?network=base
- Crypto price GET /api/crypto-price Live crypto prices for one or many coins in any vs_currency (usd, eur, btc, eth, etc). Returns last price, 24h change %, 24h volume, and market cap per coin. The simplest crypto price read - for ranked market-cap tables use crypto-market, for candles use crypto-history, and when you need an oracle-grade price with a confidence interval use price-pyth. Accepts ticker symbols (BTC, ETH, SOL) for the top ~50 by market cap, or canonical CoinGecko ids (e.g. "render-token") for any of the ~15k tracked coins. Batched: up to 25 coins per call. Backed by CoinGecko's public API - keyless.
Workflow
- Get Base gas tiers (slow/standard/fast).
- Get Ethereum gas tiers for comparison.
- Get a Base fee estimate for a standard transfer.
- Get ETH price to express costs in USD.
Call it directly
Any x402 client pays the 402 and gets the whole workflow back in one response:
npx agent402-client call gas-optimizer {}
Run it in Claude
claude mcp add agent402 -s user -- npx -y agent402-mcp@latest
Then paste this prompt into Claude:
Find the cheapest gas right now using Agent402's gas-optimizer skill pack. Get (1) Base gas tiers, (2) Ethereum gas tiers, (3) Base fee estimate, (4) ETH price. Tell me the cost in USD and whether to act now or wait.