{"uid":"cap_-JrfQ1CFCnaVfGqqzN--g","slug":"agent402-uk-ethereum-address-validator-1ac39fe7","name":"Agent402 UK Ethereum Address Validator","description":"Don't burn tokens on deterministic work. Go/no-go jobs first: payout preflight, text firewall (PII/secrets), budget check — then rails, calendars, finmath. x402 USDC on Base. UK + global. agent402.co.uk — not agent402.tools. $0.001–$0.002 USDC on Base. No API keys.","url":"https://agent402.co.uk/v1/utils/eth-address","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"address":{"type":"string","description":"0x address"}}},"responseSchema":{"type":"json","example":{"valid":true,"normalized":"0x9ef92b278a3867c429751390ec427736eb4babb2"}},"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_aQaVJnaSDoFceJtkN6t7o","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":"Validates that a string is a correctly formatted Ethereum address (0x + 40 hex chars) and returns its lowercase-normalized form","exampleAgentPrompt":"Before we proceed with the on-chain transfer, can you check whether '0x9eF92B278a3867C429751390Ec427736Eb4baBB2' is a valid Ethereum address and give me its normalized lowercase form?","exampleUseCases":[{"title":"Pre-transfer wallet address gate","prompt":"The user just pasted their ETH wallet address '0x9eF92B278a3867C429751390Ec427736Eb4baBB2' into the withdrawal form — can you verify it's a properly formatted Ethereum address before I submit the transfer?"},{"title":"DeFi agent input sanitization","prompt":"I'm about to call a smart contract with this address: '0xAbCdEf1234567890abcdef1234567890ABCDEF12' — validate it's a legitimate Ethereum address format and normalize it to lowercase so I can pass it safely."},{"title":"User onboarding wallet validation","prompt":"A new user signed up and entered '0xGHIJKL1234567890abcdef1234567890abcdef12' as their wallet address — is that a valid Ethereum address or should I ask them to re-enter it?"}],"resultDescription":"Returns a JSON object with a 'valid' boolean indicating whether the input conforms to the Ethereum address format (0x followed by exactly 40 hexadecimal characters), and a 'normalized' field containing the lowercase version of the address if valid.","failureModes":["Address missing '0x' prefix — valid returns false","Address has wrong length (not 40 hex chars after 0x) — valid returns false","Address contains non-hex characters — valid returns false","Malformed or missing 'address' field in request body — likely 400 error","Empty string input — valid returns false"],"whenToPreferThis":"Use this endpoint as a lightweight format gate immediately before any on-chain Ethereum operation, user input acceptance, or address storage step. Prefer it over rolling your own regex validation to ensure consistent hex-format and length rules. It also normalizes casing, reducing downstream checksum errors. Not a substitute for on-chain account existence checks or EIP-55 checksum validation — use it purely for structural format gating.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:31:20.194Z","isFirstParty":false}