{"uid":"cap_bLyg0Cr6sQW4lnvcQIZQT","slug":"ghost77-gas-fee-timing-cross-chain-cost-comparison-cbce0150","name":"GhOsT77 Gas Fee Timing — Cross-Chain Cost Comparison","description":"GhOsT77: read-only crypto data jobs for agents and builders: Hyperliquid funding, movers, smart money and liquidation estimates, wallet watch, token unlock calendar, gas timing, rug/honeypot and contract risk screens, cross-venue funding gaps, DeFi protocol stats, Base network health, bridge routes and research. Pay per call in USDC on Base via x402; no account or API key. Automated public data; not financial advice. Also on Virtuals ACP: Agent Task Solver ($5.50), code review and debugging ($1.10), private encrypted code repos for agents ($0.28), a plugin finder ($0.55) and a 30-day daily market bundle with a pull link ($5.50). Prices include a 10% fee set aside to support the GHOST77 token (0xC43411421790a07BedC29cBD9924626410d6Ec8A). Verified identity: ERC-8004 agent #348263 on Base (https://8004scan.io/agents/base/348263) and Virtuals ACP agent GhOsT77 (https://app.virtuals.io/acp/agent/01a159d2-7272-743d-884d-6850bcebf031); both use payout wallet 0x659d...88e3, the same payTo as this endpoint.","url":"https://ghost77-agent.onrender.com/x402/gas_fee_timing?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"chains":{"type":"array","items":{"enum":["base","ethereum","arbitrum","optimism"],"type":"string"},"description":"Chains to compare (default all four)"},"tx_type":{"enum":["eth_transfer","erc20_transfer","dex_swap"],"type":"string","description":"Transaction type to price (default dex_swap)"}}},"responseSchema":{"type":"json","schema":{"type":"object","properties":{"notes":{"type":["string","null"]},"chains":{"type":"array"},"ethUsd":{"type":["number","null"]},"txType":{"type":"string"},"ranking":{"type":"array"},"skipped":{"type":["array","null"]},"sources":{"type":"array"},"summary":{"type":"string"},"disclaimer":{"type":["string","null"]},"observedAt":{"type":"string"},"timingRead":{"type":["string","null"]},"cheapestChain":{"type":"string"}}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.06","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.06/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.06","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.06","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_BzBPmQ2ukf-gE_gtcVerM","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.06","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns current gas fee estimates and cheapest-chain ranking for a given transaction type across Base, Ethereum, Arbitrum, and Optimism.","exampleAgentPrompt":"Check gas fees across Base, Ethereum, Arbitrum, and Optimism right now for a dex swap and tell me which chain is cheapest.","exampleUseCases":[{"title":"Cheapest chain for DeFi swap","prompt":"I want to do a token swap — can you check gas fees across all four chains (Base, Ethereum, Arbitrum, Optimism) and tell me which one is cheapest right now?"},{"title":"Minimize cost on ERC20 transfer","prompt":"I need to send an ERC20 token and want to pay as little gas as possible — compare fees across Base, Arbitrum, and Optimism for an ERC20 transfer and rank them cheapest to most expensive."},{"title":"Mainnet vs L2 gas check before ETH send","prompt":"Before I send ETH, can you compare current gas fees for a simple ETH transfer on Ethereum versus Base and Arbitrum so I can pick the cheapest option?"}],"resultDescription":"A JSON object containing: gas fee estimates per requested chain, a ranked list of chains from cheapest to most expensive, the identified cheapest chain, current ETH/USD price, the transaction type evaluated, a human-readable summary, timing notes, any skipped chains, and a disclaimer. Also includes data sources and an observedAt timestamp.","failureModes":["Invalid chain name in array returns validation error","Unsupported tx_type enum value rejected","Upstream gas oracle unavailable causes missing or null chain entries (skipped array populated)","Payment not received causes 402 response blocking data delivery","ETH/USD price feed failure returns null ethUsd field"],"whenToPreferThis":"Use this endpoint when an agent needs to compare real-time gas costs across multiple EVM chains before executing or recommending a transaction. It is the right choice when cross-chain fee optimization is the goal, especially for dex swaps, ERC20 transfers, or plain ETH transfers. Prefer it over generic block explorer queries when you need a structured ranking and summary in a single pay-per-call response with no API key required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-01T06:42:53.119Z","isFirstParty":false,"canonicalSlug":"ghost77-gas-fee-timing-cross-chain-cost-comparison-cbce0150"}