{"uid":"cap_WGkPBR5Q4ONClRXm4_Ilj","slug":"halowerk-kettenwerk-evm-transaction-simulator-3f730ac3","name":"HALOWERK kettenwerk – EVM Transaction Simulator","description":"HALOWERK kettenwerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.","url":"https://kette.netzhandwerker.de/tx/simulate","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"to":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$","description":"Target address."},"gas":{"type":"integer","maximum":30000000,"minimum":21000,"description":"Optional gas limit for the simulation."},"data":{"type":"string","default":"0x","pattern":"^0x[0-9a-fA-F]*$","description":"Call data."},"from":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$","description":"Sender address. No signature is needed and none is created."},"block":{"type":"string","default":"latest","description":"\"latest\" or a block number as decimal string."},"chain":{"enum":["ethereum","base","arbitrum","optimism","polygon","bsc"],"type":"string","description":"Chain to simulate on."},"value":{"type":"string","default":"0","description":"Value in wei, decimal or 0x."},"state_overrides":{"type":"object","description":"Optional state overrides per address, in the eth_simulateV1 format (balance, nonce, code, state, stateDiff)."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.012","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":"$0.012/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.012","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.012","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_eCt1lAim6h-xOZDCyMYXn","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.012","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Simulates an EVM transaction on a specified chain and block without broadcasting it, returning execution results and state changes.","exampleAgentPrompt":"Simulate a call to the Uniswap v3 router on Ethereum mainnet — sender 0xAbCd...1234, target 0xE592427A0AEce92De3Edee1F18E0157C05861564, calldata 0x414bf389..., value 0, using the latest block — and tell me if it would succeed or revert.","exampleUseCases":[{"title":"Pre-flight DeFi swap check","prompt":"Before I execute this swap on Arbitrum, simulate it for me: from 0xDead...Beef to 0x1234...5678, calldata 0xa9059cbb..., value 0, latest block — will it succeed and how much gas will it use?"},{"title":"Debug a reverting contract call","prompt":"My transaction keeps reverting on Base. Can you simulate it with sender 0xAABB...CCDD, target 0x4200...0006, calldata 0x095ea7b3..., value 0, and tell me the revert reason?"},{"title":"Historical block state replay","prompt":"Replay this Polygon transaction as it would have executed at block 45000000: from 0x1111...2222, to 0x3333...4444, calldata 0x12345678, value 1000000000000000 wei — show me what state changes it made."}],"resultDescription":"Returns the outcome of the simulated EVM transaction including success/failure status, gas consumed, return data, revert reason (if applicable), and any state changes — without broadcasting anything to the network.","failureModes":["Invalid Ethereum address format for 'from' or 'to' → validation error","Unsupported chain value → enum validation failure","Gas limit below 21000 or above 30000000 → rejected","Malformed calldata (not valid hex) → parse error","Block number not found on the target chain → simulation error","Node unavailable for the requested chain → 503 or timeout","Insufficient payment (x402 payment missing or wrong amount) → 402 Payment Required"],"whenToPreferThis":"Choose this endpoint when you need to simulate a raw EVM transaction across Ethereum, Base, Arbitrum, Optimism, Polygon, or BSC with optional state overrides — particularly useful for pre-flight validation, debugging reverts, or replaying historical transactions. Prefer this over general RPC providers when you want a simple HTTP POST API with per-call micropayment billing (x402/USDC) rather than managing your own node or RPC credentials.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:31:07.328Z","isFirstParty":false}