{"uid":"cap_1aclphhbsvt5dllyYiajS","slug":"evm-base-fee-growth-ceiling-calculator-7fcd6c3d","name":"EVM Base Fee Growth Ceiling Calculator","description":"EVM Base Fee Growth Ceiling: EVM Base Fee Growth Ceiling compounds a caller growth fraction across future blocks from bounded caller-supplied values without an external provider. Call EVM Base Fee Growth Ceiling before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Base Fee Growth Ceiling as versioned deterministic JSON.…","url":"https://api.delx.ai/api/v1/x402/evm-base-fee-growth-ceiling","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"blocks":{"type":"integer","description":"Blocks supplied to EVM Base Fee Growth Ceiling; used only for this bounded calculation and processed in memory without retention."},"growth_fraction":{"type":"number","description":"Growth Fraction supplied to EVM Base Fee Growth Ceiling; used only for this bounded calculation and processed in memory without retention."},"current_base_fee_wei":{"type":"string","maxLength":8192,"description":"Current Base Fee Wei supplied to EVM Base Fee Growth Ceiling; used only for this bounded calculation and processed in memory without retention."}}},"responseSchema":{"type":"json","example":{"result":{"blocks":3,"fee_ceiling_wei":"1423828125"},"schema":"delx/util-evm-base-fee-growth-ceiling/v1","status":"pass","evidence":{"retained":false,"input_sha256":"e6331adf36b1a6016a316e2580f099fd04ebb97045f034d65e705d7114cceb67","external_calls":0},"operation":"evm_preflight:evm_base_fee_growth_ceiling"}},"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_54uMi0lYKiTUldcwv2DMf","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 maximum base fee in wei that an EVM network could reach after a given number of blocks, given a fractional growth rate and starting base fee.","exampleAgentPrompt":"Calculate the EVM base fee growth ceiling starting from a current base fee of 1000000000 wei, with a growth fraction of 0.125, over 3 blocks — I need to know the worst-case fee ceiling before I submit my transaction batch.","exampleUseCases":[{"title":"Pre-flight gas budget for batch transactions","prompt":"Before I submit 20 transactions on-chain, calculate the base fee ceiling starting at 800000000 wei with a 12.5% growth fraction over 5 blocks so I know the worst-case gas cost I'm committing to."},{"title":"DeFi bot fee guardrail check","prompt":"My DeFi agent is about to execute an arbitrage — can you compute the max base fee ceiling it could hit if it waits 6 blocks, starting from 1500000000 wei current base fee with a growth fraction of 0.125?"},{"title":"Smart contract deployment cost modeling","prompt":"I'm planning a smart contract deployment and want to model the worst-case base fee over the next 10 blocks. Current base fee is 2000000000 wei and the EVM growth fraction is 0.125 — what's the fee ceiling?"}],"resultDescription":"Returns a JSON object containing the computed fee_ceiling_wei (the maximum base fee in wei after the specified number of blocks), the number of blocks used in the calculation, the operation name, status (pass/fail), and an evidence block confirming no data was retained and no external calls were made.","failureModes":["Missing or invalid blocks integer — returns validation error","Invalid growth_fraction (e.g. negative or >1 without clear context) — may return error or unexpected result","current_base_fee_wei exceeds maxLength of 8192 characters — rejected at schema level","Malformed JSON body — HTTP 400 or schema validation failure","Payment not attached (x402 protocol) — returns HTTP 402 Payment Required"],"whenToPreferThis":"Use this endpoint when you need a deterministic, in-memory computation of the EVM base fee ceiling with no external calls or data retention — ideal for agent preflighting before submitting EVM transactions, budgeting gas costs in DeFi bots, or modeling worst-case fee scenarios for smart contract workflows. Prefer this over off-chain estimates when you need a provable, auditable result with an input hash in the evidence block.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:57:44.091Z","isFirstParty":false}