{"uid":"cap_G2TAFPb26PmXgfV45-Hfl","slug":"x402engine-ens-reverse-lookup-f48d4fb1","name":"x402engine ENS Reverse Lookup","description":"Reverse-resolve an Ethereum address to its ENS name","url":"https://x402engine.app/api/ens/reverse","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["address"],"properties":{"address":{"type":"string","example":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","description":"Ethereum address (0x...)"}},"additionalProperties":false}},"additionalProperties":false}}},"responseSchema":null,"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_zz8N7RJvMO7OBqyMvCrX1","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":"Resolves an Ethereum address to its ENS (Ethereum Name Service) human-readable name via a pay-per-call micropayment API.","exampleAgentPrompt":"What's the ENS name registered to the Ethereum address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045?","exampleUseCases":[{"title":"Identify a wallet's ENS handle","prompt":"I just got a transfer from 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 — do they have an ENS name registered to that address?"},{"title":"Enrich on-chain transaction data","prompt":"For this list of Ethereum sender addresses from our transaction log, can you look up their ENS names so I can display human-readable identities in the UI instead of raw hex addresses?"},{"title":"Verify a public figure's wallet identity","prompt":"I've seen vitalik.eth mentioned online — can you confirm whether the address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 actually resolves to vitalik.eth on ENS?"}],"resultDescription":"Returns the ENS human-readable name (e.g. 'vitalik.eth') associated with the provided Ethereum address, or an indication that no reverse record exists for that address.","failureModes":["Address has no ENS reverse record set — returns null or empty name","Invalid or malformed Ethereum address — returns 400 or validation error","Payment failure via x402 micropayment protocol — returns 402","ENS resolver or upstream node unavailable — returns 500 or timeout"],"whenToPreferThis":"Use this endpoint when you need to resolve a raw Ethereum 0x address to its ENS name, especially in agent workflows that require human-readable Web3 identities or on-chain identity enrichment. Prefer this over building your own ENS resolution when you need a pay-per-call, no-subscription model accessible via HTTP.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T12:40:57.658Z","isFirstParty":false}