{"uid":"cap_MtBV1SSjqElRW5FW4s__j","slug":"agent402-ethereum-address-eip-55-checksum-validator-dfc2dfb9","name":"Agent402 Ethereum Address EIP-55 Checksum 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/validate/eth-address","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"address":{"type":"string","description":"0x address"}}},"responseSchema":{"type":"json","example":{"valid":true,"checksummed":"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_Yq4YhlXYupM98gJb4jRsl","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 and normalizes an Ethereum address to its EIP-55 checksummed form, returning validity status and canonical casing.","exampleAgentPrompt":"Can you validate and checksum this Ethereum address for me — 0x9ef92b278a3867c429751390ec427736eb4babb2 — and tell me if it's properly formatted?","exampleUseCases":[{"title":"Pre-transaction address sanity check","prompt":"Before I send funds, can you verify that 0x9ef92b278a3867c429751390ec427736eb4babb2 is a valid Ethereum address and give me the properly checksummed version?"},{"title":"User-submitted wallet address cleanup","prompt":"A user just entered 0X9EF92B278A3867C429751390EC427736EB4BABB2 as their payout wallet — can you validate it and normalize it to the correct EIP-55 checksum format?"},{"title":"Smart contract interaction guard","prompt":"I'm about to call a smart contract and I want to make sure 0x9ef92b278a3867C429751390EC427736eB4bAbB2 is a real, correctly checksummed Ethereum address before I proceed."}],"resultDescription":"Returns a JSON object with a boolean 'valid' field indicating whether the input is a structurally valid Ethereum address, and a 'checksummed' string field containing the EIP-55 mixed-case canonical form of the address (e.g. {\"valid\": true, \"checksummed\": \"0x9EF92b278a3867C429751390EC427736eB4BABB2\"}). Does not check on-chain balance, ENS names, or contract existence.","failureModes":["Malformed address (not 40 hex chars after 0x) returns valid: false","Non-hex characters in address body cause validation failure","Missing 0x prefix may cause invalid result","Address with correct length but invalid hex digits returns valid: false","Network/payment errors return HTTP 402 or 5xx status"],"whenToPreferThis":"Use this endpoint when your agent needs a pure structural and checksum validation of an Ethereum address — with no on-chain lookup, no balance check, and no ENS resolution. It is ideal for input sanitization pipelines, pre-transaction guards, and anywhere you need the canonical EIP-55 mixed-case form of an address cheaply and deterministically at $0.001 per call. Prefer it over on-chain RPC calls when you only need format correctness, not account state.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:50:22.080Z","isFirstParty":false}