{"uid":"cap_hec0yKZXD1zygyAmpDmSG","slug":"ens-resolver-2163cf79","name":"ENS Resolver","description":"Look up an ENS name or an Ethereum address and get back the matching one, automatically figuring out which direction you need.","url":"https://ens-resolver.underscoredone.com/resolve","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"query":{"type":"string","description":"An ENS name like vitalik.eth, or an Ethereum address starting with 0x. The service automatically figures out which one you gave it."}}},"responseSchema":{"type":"json","example":{"api_version":"1.0.0"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/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_XiMnXduaU0U-1VJopDicI","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 ENS name to its Ethereum address, or reverse-resolves an Ethereum address to its ENS name.","exampleAgentPrompt":"What Ethereum address does vitalik.eth resolve to? Also, can you do the reverse and look up the ENS name for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045?","exampleUseCases":null,"resultDescription":"Returns the resolved counterpart: if given an ENS name like vitalik.eth, returns the corresponding Ethereum address; if given a 0x Ethereum address, returns the matching ENS name. Response is a JSON object with API version metadata.","failureModes":["ENS name does not exist or has no resolver set — returns error or null address","Ethereum address has no reverse ENS record registered — returns empty or null name","Malformed input (invalid ENS name or non-0x address) — returns validation error","ENS resolution temporarily unavailable due to Ethereum node issues — returns 5xx error","Payment not processed correctly via x402 protocol — returns 402 Payment Required"],"whenToPreferThis":"Use this endpoint when an AI agent needs to resolve ENS names to Ethereum addresses or perform reverse resolution in a lightweight, pay-per-call manner without managing RPC infrastructure. Ideal for agents that occasionally need ENS lookups without a persistent Ethereum node connection.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:37:41.522Z","isFirstParty":false}