{"uid":"cap_s8QrdGSRKjL7xRwg8JBds","slug":"api-justaname-id-841a464a","name":"JustAName ENS Reverse Resolver","description":"Resolves an address into its ENS reverse record on a given chain, with batch support up to 50 addresses and per-address chain scoping via interop addresses.","url":"https://api.justaname.id/ens/v2/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":{"body":{},"type":{"const":"http"},"method":{"enum":["GET","HEAD","DELETE","POST","PUT","PATCH"],"type":"string"},"bodyType":{"type":"string"},"queryParams":{"type":"object"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"enum":["json","text"]},"format":{"type":"string"},"example":{}},"additionalProperties":false}},"additionalProperties":false},"responseSchema":{"type":"json","example":{"name":"vitalik.eth","address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","viaUniversalResolver":true}},"example":{"request":{"input":{"type":"http","method":"GET","queryParams":{"address":["0x1234567890123456789012345678901234567890"],"coinType":"60"}}},"response":{"result":{"data":{"name":null,"address":"0x1234567890123456789012345678901234567890","coinType":60,"viaUniversalResolver":true},"error":null},"statusCode":200}},"exampleRequest":{"address":["0x1234567890123456789012345678901234567890"],"coinType":"60"},"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_m2XjiP9IbXEZpfTKmFfcP","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Resolves one or more Ethereum addresses into their ENS reverse records (human-readable names), with batch support up to 50 addresses and per-address chain scoping.","exampleAgentPrompt":"What ENS name is registered for the Ethereum address 0x1234567890abcdef1234567890abcdef12345678 on mainnet (chain ID 1)?","exampleUseCases":null,"resultDescription":"Returns the ENS reverse record (human-readable name like 'vitalik.eth') for the provided Ethereum address(es), with per-address chain scoping when using interop addresses. Supports batch resolution of up to 50 addresses in a single call.","failureModes":["Address has no ENS reverse record set — returns empty or null name","Invalid Ethereum address format — returns 400 error","Batch exceeds 50 addresses — returns error or truncated results","Unsupported chain ID — returns error or no result","Network or provider downtime — returns 5xx error","Rate limit exceeded — returns 429 error"],"whenToPreferThis":"Use this endpoint when you need to display or identify wallet addresses by their human-readable ENS names, especially when handling up to 50 addresses at once or when you need per-address chain scoping via interop addresses. Prefer this over generic ENS resolvers when you need reliable batch reverse resolution with chain-level granularity.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:33:40.099Z","isFirstParty":false}