{"uid":"cap_XzaXQjAKUdkvyn0M7mtHD","slug":"public-evm-fee-observation-comparison-ddc83f4a","name":"Public EVM Fee Observation Comparison","description":"Public EVM Fee Observation Comparison: Compare timestamped fee observations for up to three supported chains using free public RPC: Base, Arbitrum and Optimism. Includes partial-source failures. Excludes L1 data fees; this is not a total-cost quote or inclusion guarantee. 0.01 USDC includes one bounded crypto-data report.","url":"https://market.datapackvibe.com/x402/assistant-local-gas-comparison?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"chains":{"type":"array","items":{"enum":["base","arbitrum","optimism"],"type":"string"},"default":["base","optimism"],"maxItems":3,"minItems":1,"uniqueItems":true}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Ocssuh3fyfQOACrZ1R50k","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches and compares timestamped gas fee observations across up to three EVM chains (Base, Arbitrum, Optimism) using free public RPC endpoints.","exampleAgentPrompt":"Can you compare the current gas fees on Base, Arbitrum, and Optimism right now and tell me which chain is cheapest?","exampleUseCases":[{"title":"Pre-transaction chain selection","prompt":"Before I bridge tokens, can you check live gas fee observations on Base and Arbitrum and tell me which one is cheaper to transact on right now?"},{"title":"DeFi bot chain routing","prompt":"I need to pick the cheapest L2 to execute a swap — compare current gas fee observations on Base, Arbitrum, and Optimism for me."},{"title":"Developer cost monitoring snapshot","prompt":"Pull a timestamped gas fee snapshot across Base and Optimism so I can log which chain had lower fees at this moment."}],"resultDescription":"Returns timestamped gas fee observations for each requested chain (Base, Arbitrum, Optimism), sourced from free public RPCs. Includes per-chain fee data and flags any partial-source failures. Does not include L1 data fees and is not a total cost quote or transaction inclusion guarantee.","failureModes":["Partial source failure: one or more chains may return incomplete or missing data if the public RPC is unresponsive","Invalid chain enum: supplying a chain name other than base, arbitrum, or optimism will be rejected","Exceeding maxItems: requesting more than 3 chains is invalid","Stale data: public RPC nodes may return slightly lagged fee data","Payment failure: x402 payment of 0.01 USDC must succeed before data is returned"],"whenToPreferThis":"Choose this endpoint when you need a quick, low-cost snapshot comparison of gas fees across Base, Arbitrum, and/or Optimism using public RPC data. Ideal for agents routing transactions to the cheapest chain or logging fee benchmarks. Not suitable when you need total transaction cost including L1 data fees, guaranteed inclusion estimates, or chains beyond these three L2s.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-19T00:56:04.592Z","isFirstParty":false,"canonicalSlug":"public-evm-fee-observation-comparison-ddc83f4a"}