{"uid":"cap_XQLRM5HvBr_xjuIVP3R6s","slug":"skills-onesource-io-95ea7e2b","name":"skills.onesource.io Ethereum Proxy Pattern Detector","description":"Detect proxy patterns (EIP-1967, UUPS, Transparent) via eth_getStorageAt","url":"https://skills.onesource.io/api/chain/proxy/0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48?utm_source=zero.xyz","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":{"type":"string","const":"GET"}},"additionalProperties":false}}},"responseSchema":{"type":"object","required":["data","meta"],"properties":{"data":{"type":"object","required":["address","is_proxy","proxy_type","implementation","is_contract"],"properties":{"address":{"type":"string"},"is_proxy":{"type":"boolean"},"proxy_type":{"type":"string"},"is_contract":{"type":"boolean"},"implementation":{"type":"string"}}},"meta":{"type":"object","required":["endpoint","request_id"],"properties":{"endpoint":{"type":"string"},"request_id":{"type":"string"}}}}},"example":{"request":{"input":{"type":"http","method":"GET"}},"response":{"data":{"address":"0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48","is_proxy":true,"proxy_type":"slot0","is_contract":true,"implementation":"0xfcb19e6a322b27c06842a71e8c725399f049ae3a"},"meta":{"endpoint":"/api/chain/proxy/0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48","request_id":"e7b4fdd7fd7827aa"}}},"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005000","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":"$0.005000/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_SVzAi7ps9bivZ6CuVl_29","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Detects whether an Ethereum address is a proxy contract and identifies its pattern (EIP-1967, UUPS, Transparent/slot0) along with the implementation address","exampleAgentPrompt":"Is 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 a proxy contract on Ethereum mainnet, and if so what proxy pattern does it use and what's the implementation address behind it?","exampleUseCases":null,"resultDescription":"Returns an object with: the queried address, a boolean is_proxy indicating if it's a proxy, the proxy_type (e.g. 'slot0', 'EIP-1967', 'UUPS', 'Transparent', or 'none'), a boolean is_contract confirming the address is a contract, and the implementation address if applicable. Also includes metadata with endpoint and request_id.","failureModes":["Invalid address format (not a valid 0x hex address) — returns validation error","Address is an EOA (externally owned account), not a contract — is_contract: false, is_proxy: false","Unsupported network specified — enum validation error","RPC timeout or node unavailability — upstream error","Non-proxy contract — returns is_proxy: false with no implementation address"],"whenToPreferThis":"Use this endpoint when you need to determine if a smart contract is upgradeable and identify its proxy architecture pattern via low-level storage slot inspection (eth_getStorageAt). Prefer this over generic contract info endpoints when the specific proxy type and implementation address are needed for security auditing, contract interaction routing, or DeFi due diligence.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T18:37:16.170Z","isFirstParty":false,"canonicalSlug":"skills-onesource-io-95ea7e2b"}