{"uid":"cap_H6ny5UPsZqzirWYrfgWH4","slug":"evm-gas-fees-5d9a8204","name":"EVM Gas Fees","description":"Current EIP-1559 gas fees for Ethereum, Base, Arbitrum, Optimism or Polygon: next base fee, slow/standard/fast priority and max fee in gwei, block utilisation and the cost of a plain transfer (L2 L1-data fees excluded). Use right before sending a transaction or to compare chains.","url":"https://bess-x402.onrender.com/v1/chain/gas?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["chain"],"properties":{"chain":{"enum":["arbitrum","base","ethereum","optimism","polygon"],"type":"string","description":"EVM chain"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_mJ9XAxvXg-Zs5iF4dcOyA","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns current EIP-1559 gas fees (base fee, priority tiers, max fee in gwei, block utilisation) for Ethereum, Base, Arbitrum, Optimism, or Polygon.","exampleAgentPrompt":"What are the current EIP-1559 gas fees on Ethereum — give me the slow, standard, and fast priority fees and next base fee in gwei so I know what to set before sending my transaction.","exampleUseCases":[{"title":"Pre-transaction gas check on Ethereum","prompt":"I'm about to send a transaction on Ethereum — what are the current base fee and fast priority fee in gwei right now so I can set the right max fee?"},{"title":"Cheapest chain for low-cost transfer","prompt":"I need to move some funds and want to pick the cheapest chain — can you check gas fees on Base, Arbitrum, Optimism, and Polygon right now and tell me which one has the lowest cost for a plain transfer?"},{"title":"Monitor Polygon gas before a batch mint","prompt":"Before I kick off a batch NFT mint on Polygon, can you check the current block utilisation and standard gas fee so I know whether to proceed now or wait for congestion to drop?"}],"resultDescription":"Returns the current EIP-1559 gas parameters for the requested chain: next base fee, slow/standard/fast priority fees, and max fee all in gwei, current block utilisation percentage, and the estimated cost of a plain native-token transfer (note: L2 L1-data fees are excluded).","failureModes":["Invalid or unsupported chain name returns a validation error","RPC or upstream node unavailability may return a 503 or timeout","Chain enum must exactly match one of: ethereum, base, arbitrum, optimism, polygon — typos cause 400 errors","Payment failure (insufficient USDC) results in 402 Payment Required"],"whenToPreferThis":"Use this endpoint immediately before submitting an EVM transaction when you need accurate, live EIP-1559 gas parameters rather than stale estimates. Ideal for comparing gas costs across the five supported chains (Ethereum, Base, Arbitrum, Optimism, Polygon) in a single call per chain. Not suitable if you need L2 L1-data fee breakdowns or historical gas data.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T07:06:53.288Z","isFirstParty":false,"canonicalSlug":"evm-gas-fees-5d9a8204"}