{"uid":"cap_KBZcn7zu-B9fNM6Xz50Ft","slug":"whale-hugen-tokyo-514cde34","name":"whale.hugen.tokyo Ethereum Address Label Lookup","description":"Look up any Ethereum address — returns entity labels, name tags, and categories from 412K+ labeled addresses. AI agent API for on-chain identity resolution","url":"https://whale.hugen.tokyo/whale/lookup","method":"GET","headers":{},"bodySchema":{"properties":{"input":{"required":["method"]}}},"responseSchema":null,"example":{"request":{"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"},"response":{"labels":[],"address":"0xd8da6bf26964af9d7eed9e03e53415d37aa96045","label_count":0,"entity_summary":"Unknown"}},"exampleRequest":{"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"},"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_A6KCZJhGjnVD5T4W_DLw5","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Resolves an Ethereum address to its entity label, name tag, and category from a database of 412K+ labeled on-chain identities","exampleAgentPrompt":"Can you look up who owns or controls the Ethereum address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 — I want to know its entity label, name tag, and what category it falls under?","exampleUseCases":null,"resultDescription":"Returns the entity label (e.g. 'Vitalik Buterin'), name tag, and category (e.g. 'individual', 'exchange', 'DeFi protocol') associated with the queried Ethereum address, sourced from a database of over 412,000 labeled addresses.","failureModes":["Address not found in the 412K labeled set — returns empty or null result","Invalid Ethereum address format — likely returns a 400 bad request","Payment failure via x402 protocol — returns 402 Payment Required","Rate limiting or quota exhaustion — returns 429 or equivalent","Network timeout — returns 5xx error"],"whenToPreferThis":"Use this endpoint when you need to resolve an Ethereum address to a human-readable identity, entity label, or category — especially useful for blockchain analytics, due diligence on wallet addresses, or enriching transaction data with identity context. Prefer this over generic blockchain explorers when you specifically need structured label/category data accessible programmatically by an AI agent.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:33:06.821Z","isFirstParty":false}