{"uid":"cap_i4RRrtS6fAHApRIKD48js","slug":"proxy-implementation-slot-reader-2eddcdcc","name":"Proxy Implementation Slot Reader","description":"Use when you need to know if a contract on Base, Ethereum, Arbitrum, Optimism or Polygon is an upgradeable proxy: reads the EIP-1967, ZeppelinOS and EIP-1822 (UUPS) implementation and admin slots, names the standard, and tells whether the address has code.","url":"https://biosfera.46-62-215-147.sslip.io/o/proxy-implementation?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["chain","address"],"properties":{"chain":{"enum":["base","ethereum","arbitrum","optimism","polygon"],"type":"string"},"address":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$"}},"additionalProperties":false}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.0015","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":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.0015/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0015","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0015","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_8QoCpUSXRa1K8kkERkHBq","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0015","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Reads EIP-1967, ZeppelinOS, and EIP-1822 (UUPS) proxy implementation and admin storage slots on Base, Ethereum, Arbitrum, Optimism, or Polygon to identify upgrade patterns and implementation addresses.","exampleAgentPrompt":"Can you check if the contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum is an upgradeable proxy, and if so, what implementation address and proxy standard (EIP-1967, UUPS, etc.) is it using?","exampleUseCases":[{"title":"Audit upgradeable DeFi protocol contract","prompt":"I'm auditing a DeFi protocol and need to know if the contract at 0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9 on Ethereum is an upgradeable proxy — tell me the implementation address, the admin, and which proxy standard it uses."},{"title":"Verify Arbitrum bridge proxy pattern","prompt":"Check whether the contract 0x8315177aB297bA92A06054cE80a67Ed4DBd7ed3a on Arbitrum is a proxy contract and, if so, what's the underlying implementation address and standard being used?"},{"title":"Monitor Base contract for proxy upgrades","prompt":"I want to know the current implementation address and proxy type for the contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base — is it upgradeable and what standard does it follow?"}],"resultDescription":"Returns the proxy standard name (e.g. EIP-1967, ZeppelinOS, UUPS), the implementation contract address stored in the relevant slot, the admin address if available, and a boolean indicating whether the address actually has deployed bytecode.","failureModes":["Address is not a proxy contract — slots return zero address or empty","Invalid address format (must match 0x + 40 hex chars)","Unsupported chain value returns validation error","Network RPC timeout or chain temporarily unavailable","Contract has code but uses a non-standard or unknown proxy pattern not covered by EIP-1967/ZeppelinOS/UUPS"],"whenToPreferThis":"Choose this endpoint when you need to inspect the proxy architecture of a specific smart contract across major EVM chains — particularly when auditing upgradeable contracts, tracing logic contract addresses, or determining whether a contract can be upgraded and by whom. It is preferable to manual RPC slot reads because it abstracts the raw storage slot decoding and proxy standard identification in a single call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-03T08:27:09.312Z","isFirstParty":false,"canonicalSlug":"proxy-implementation-slot-reader-2eddcdcc"}