{"uid":"cap_J6N-guvLiPW3_i5rdR6lu","slug":"markt-halowerk-com-ethereum-gas-price-estimator-f58b2e57","name":"markt.halowerk.com Ethereum Gas Price Estimator","description":"Reads eth_feeHistory over the last ten blocks with reward percentiles 25, 50 and 75, and falls back to eth_gasPrice when a node does not serve fee history. base_fee_gwei is the base fee of the next block, not of the last one, because that is the fee a transaction sent now will actually pay. recommended_gwei is a bid, not an observation: priority at the median plus a base fee doubled to survive several full blocks, and the rule is stated in recommended_rule. cost_usd converts that into dollars fo","url":"https://markt.halowerk.com/gas","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"chain":{"enum":["ethereum","base"],"type":"string","default":"ethereum","description":"Chain to measure. ethereum or base."},"action":{"enum":["transfer","erc20","swap"],"type":"string","default":"transfer","description":"Which transaction the cost estimate is for: transfer, erc20 or swap."}}},"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_hyfwgvSjpetHV4G2KZ07n","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 Ethereum gas fee estimates including base fee, recommended bid in gwei, and USD cost, using eth_feeHistory over the last 10 blocks with 25/50/75 percentile rewards.","exampleAgentPrompt":"What's the recommended gas fee in gwei for sending an Ethereum transaction right now, and what would that cost me in USD?","exampleUseCases":[{"title":"Pre-trade gas cost check","prompt":"Before I submit this ETH swap, tell me the current recommended gas bid in gwei and how much it'll cost in dollars so I can decide if it's worth it right now."},{"title":"Automated DeFi bot gate","prompt":"Check the current Ethereum base fee and recommended gas price — if the cost in USD is under $2, go ahead and trigger my liquidity rebalance transaction."},{"title":"Gas fee monitoring alert","prompt":"What's the Ethereum base fee for the next block right now, and what's the recommended gwei bid I should use to make sure my transaction goes through within a few blocks?"}],"resultDescription":"Returns base_fee_gwei (the base fee of the next block, not the last), recommended_gwei (a computed bid based on median priority fee plus doubled base fee for block survival), recommended_rule (the formula used), and cost_usd (the recommended bid converted to US dollars). Falls back to eth_gasPrice if the node does not support fee history.","failureModes":["Node does not support eth_feeHistory — falls back to eth_gasPrice automatically","RPC node unreachable or rate-limited — returns error","Stale block data if node is behind — may produce outdated estimates","USD conversion may lag if price feed is delayed"],"whenToPreferThis":"Choose this endpoint when you need a ready-to-use recommended gas bid for Ethereum transactions, including USD cost conversion, rather than raw node data. It abstracts away EIP-1559 complexity (base fee + priority fee logic) and handles node fallback automatically. Prefer over raw RPC calls when you need a single actionable number rather than raw fee history arrays.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:53:40.989Z","isFirstParty":false}