{"uid":"cap_I_rT6UJ8QIbgpKsrUTuKV","slug":"vextorium-evm-developer-utilities-3cefa403","name":"Vextorium EVM Developer Utilities","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/evm-utilidades-pago?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"required":["operacion","valor"],"properties":{"a":{"enum":["wei","gwei","ether"],"type":"string","description":"Target unit for convertir"},"de":{"enum":["wei","gwei","ether"],"type":"string","description":"Source unit for convertir"},"valor":{"type":"string","description":"Input value (text, hex, signature, address or number)"},"operacion":{"enum":["keccak256","selector","checksum","convertir"],"type":"string","description":"Operation"}}},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"entrada":{"type":["string","null"]},"operacion":{"type":["string","null"]},"resultado":{"type":["string","null"]}}}}}}},"responseSchema":{"type":"json","example":{"entrada":"transfer(address,uint256)","operacion":"selector","resultado":"0xa9059cbb"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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_uiVB0KAvx2wQ5mfLzCzv-","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Performs EVM developer operations: keccak256 hashing, function selector derivation from ABI signature, EIP-55 checksum address formatting, and wei/gwei/ether unit conversion.","exampleAgentPrompt":"Can you get the 4-byte function selector for the Solidity signature transfer(address,uint256) using the EVM utilities?","exampleUseCases":[{"title":"Derive Solidity function selector","prompt":"What's the 4-byte selector for the function signature balanceOf(address)? I need it for a low-level call in my smart contract."},{"title":"Convert ether to wei for transaction","prompt":"Convert 0.05 ether to wei — I need the exact number to pass as a transaction value."},{"title":"Checksum an Ethereum address","prompt":"Can you apply EIP-55 checksum formatting to this Ethereum address: 0xab5801a7d398351b8be11c439e05c5b3259aec9b?"}],"resultDescription":"Returns a JSON object with fields: operacion (the operation performed), entrada (the input value), and resultado (the computed output — a hex hash, 4-byte selector hex string, checksummed address, or converted numeric string depending on the operation).","failureModes":["Missing required fields (operacion or valor) returns an error response","Invalid or malformed Ethereum address returns an error on checksum operation","Unrecognized operation enum value returns a validation error","Non-numeric input to convertir returns a parsing error","Missing 'de' or 'a' unit fields when calling convertir returns an incomplete request error"],"whenToPreferThis":"Choose this endpoint when you need fast, stateless EVM developer computations — hashing, selector derivation, address checksumming, or unit conversion — without spinning up a local Web3 library. Ideal for agents building or validating smart contract interactions, encoding ABI calls, or normalizing Ethereum addresses on the fly.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T18:59:55.256Z","isFirstParty":false,"canonicalSlug":"vextorium-evm-developer-utilities-3cefa403"}