{"uid":"cap_fE6mou5qqO6iYTn2TEnxZ","slug":"delx-commerce-evm-next-base-fee-bound-d91f0dfa","name":"Delx Commerce — EVM Next Base Fee Bound","description":"Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.","url":"https://commerce.delx.ai/api/v1/x402/evm-next-base-fee-bound?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"current_base_fee_wei":{"type":"string","maxLength":8192,"description":"Current Base Fee Wei supplied to EVM Next Base Fee Bound; used only for this bounded calculation and processed in memory without retention."},"maximum_change_fraction":{"type":"number","description":"Maximum Change Fraction supplied to EVM Next Base Fee Bound; used only for this bounded calculation and processed in memory without retention."}}},"responseSchema":{"type":"json","example":{"result":{"lower_wei":"875000000","upper_wei":"1125000000"},"schema":"delx/util-evm-next-base-fee-bound/v1","status":"pass","evidence":{"retained":false,"input_sha256":"bd788e10cae66dfcf807641601d7bf74d3bd4f11c95ecfe6477c865c191f130f","external_calls":0},"operation":"evm_preflight:evm_next_base_fee_bound"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_qWIAjhxhTYYb21ZhG9jzV","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes the bounded lower and upper range (in wei) for the next EVM block's base fee given a current base fee and a maximum change fraction","exampleAgentPrompt":"Before I submit this transaction on Base, calculate the lower and upper bounds for the next block's base fee — the current base fee is 1000000000 wei and the maximum change fraction is 0.125.","exampleUseCases":[{"title":"Pre-flight gas estimation for smart contract call","prompt":"I'm about to send a smart contract transaction on Base and want to make sure I set the right max fee. The current base fee is 875000000 wei and the maximum change fraction is 0.125 — can you give me the lower and upper bound for what the next block's base fee might be?"},{"title":"DeFi agent transaction timing optimization","prompt":"My DeFi agent is deciding whether to execute a swap now or wait a block. The current base fee is 2000000000 wei with a max change fraction of 0.125. What's the bounded range for the next block's base fee so I can decide if it's worth waiting?"},{"title":"Gas price monitoring for batch transaction scheduling","prompt":"I'm scheduling a batch of EVM transactions and need to know the next base fee range to set appropriate gas limits. Current base fee is 500000000 wei and max change fraction is 0.125 — what are the lower and upper bounds?"}],"resultDescription":"Returns a JSON object containing the computed lower_wei and upper_wei bounds for the next EVM block's base fee, along with a status ('pass'), schema identifier, and evidence metadata confirming no data is retained and no external calls were made during computation.","failureModes":["Invalid or missing current_base_fee_wei string may result in a computation error","maximum_change_fraction outside expected range (e.g. negative or greater than 1/8 per EIP-1559) may yield unexpected bounds","Malformed JSON input may cause a 400-level error","Payment failure via x402 protocol may prevent the call from being processed"],"whenToPreferThis":"Choose this endpoint when you need a fast, verifiable, privacy-preserving calculation of the next EVM base fee range without setting up your own computation logic. It is ideal for AI agents doing EVM transaction preflight checks on the Base network, especially when you want cryptographic evidence of computation (input hash, no retention, no external calls). Prefer it over building your own EIP-1559 base fee math when you need a trustless, pay-per-use model with no API key signup.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T00:53:53.466Z","isFirstParty":false,"canonicalSlug":"delx-commerce-evm-next-base-fee-bound-d91f0dfa"}