{"uid":"cap_o8_y-PGstWwAvWysW0beY","slug":"vextorium-evm-utils-6a564993","name":"Vextorium EVM Utils","description":"EVM developer utilities: keccak256 hash, function selector from a signature, EIP-55 checksum address and wei/gwei/ether conversion.","url":"https://api.vextorium.com/v1/evm-utils?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"a":{"enum":["wei","gwei","ether"],"type":"string","description":"Target unit for convertir"},"from":{"enum":["wei","gwei","ether"],"type":"string","description":"Source unit for convertir"},"trade":{"enum":["keccak256","selector","checksum","convert"],"type":"string","description":"Operation"},"value":{"type":"string","description":"Input value (text, hex, signature, address or number)"}}},"responseSchema":{"type":"json","example":{"input":"transfer(address,uint256)","trade":"selector","result":"0xa9059cbb"}},"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_mMDSxsugu1sx0feF2BK-4","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Performs EVM/Solidity utility operations: keccak256 hashing, function selector computation, EIP-55 checksum address formatting, and Ether unit conversion (wei/gwei/ether).","exampleAgentPrompt":"Compute the 4-byte function selector for the Solidity signature 'transfer(address,uint256)' using the EVM utils.","exampleUseCases":[{"title":"Function selector for smart contract call","prompt":"What's the 4-byte function selector for the Solidity function signature 'approve(address,uint256)'? I need it to build a raw EVM transaction."},{"title":"Convert wei amount to ether","prompt":"Convert 1500000000000000000 wei to ether so I can display it in a human-readable format."},{"title":"Checksum an Ethereum address","prompt":"Can you apply EIP-55 checksum formatting to the Ethereum address '0xd8da6bf26964af9d7eed9e03e53415d37aa96045' so it's properly capitalised?"}],"resultDescription":"Returns a JSON object with three fields: 'input' (the original value you submitted), 'trade' (the operation performed, e.g. 'selector', 'keccak256', 'checksum', or 'convert'), and 'result' (the computed output — a hex string, checksummed address, or numeric value depending on the operation).","failureModes":["Invalid or malformed input value for the chosen operation (e.g. non-hex string for checksum)","Missing required 'from'/'a' unit fields when using the 'convert' operation","Unsupported 'trade' enum value causing validation error","Network or upstream service timeout returning a 5xx error","Malformed JSON body causing a 400 Bad Request"],"whenToPreferThis":"Choose this endpoint when you need quick, serverless EVM/Solidity utility computations without running a local Ethereum node — specifically for hashing arbitrary data with keccak256, deriving Solidity function selectors from ABI signatures, normalising Ethereum addresses to EIP-55 checksum format, or converting between wei, gwei, and ether units. It is pay-per-call via USDC (x402) so there is no subscription overhead, making it ideal for on-demand agent workflows.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-15T12:37:42.509Z","isFirstParty":false,"canonicalSlug":"vextorium-evm-utils-6a564993"}