{"uid":"cap_NSb9TvuFNMWaxXuS6PAyb","slug":"proxy-contract-detector-implementation-resolver-fb2c1bfa","name":"Proxy Contract Detector & Implementation Resolver","description":"Detect whether a contract is an upgradeable proxy and resolve its implementation address by reading EIP-1967/1822 storage slots on Ethereum or Base - on-chain state LLMs cannot access. proxy detect, proxy contract, implementation address, upgradeable proxy, eip1967, proxy resolver","url":"https://api.x402node.dev/chain/proxy-detect","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":{"chain":{"type":"string","description":"ethereum, base (default)"},"address":{"type":"string","description":"Contract address (required)"}}}},"additionalProperties":false}}},"responseSchema":null,"example":{"request":{"chain":"ethereum","address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"},"response":{"note":"Standard contract (no known proxy slots).","_hint":"x402 paid endpoints for AI agents — x402node.dev (utilities) · cn402.com (Chinese culture)","chain":"ethereum","source":"eth_getStorageAt","address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","isProxy":false,"proxyType":null,"isContract":true,"proxySlots":{},"implementation":null}},"exampleRequest":{"chain":"ethereum","address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"},"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/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_nvONToJDDMulW_ZIFfmuN","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":"Detects whether an Ethereum or Base contract is an upgradeable proxy and resolves its current implementation address by reading EIP-1967/EIP-1822 storage slots on-chain.","exampleAgentPrompt":"Can you check if the contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum is an upgradeable proxy, and if so, what's the current implementation address it points to?","exampleUseCases":null,"resultDescription":"Returns whether the contract is a proxy, the detected proxy standard (EIP-1967 or EIP-1822), the resolved implementation contract address, and the raw storage slot values read from the chain.","failureModes":["Contract address is not a valid Ethereum address — returns 400 or validation error","Contract is not deployed on the specified chain — returns empty or null implementation","Network is unavailable or RPC node is unresponsive — returns 500 or timeout","Contract exists but uses a non-standard or custom proxy pattern not covered by EIP-1967/1822 — returns proxy=false even though it may be a proxy","Invalid or unsupported chain specified — returns 400"],"whenToPreferThis":"Use this endpoint when you need to determine whether a smart contract is an upgradeable proxy and identify its underlying implementation address — particularly when you cannot read on-chain storage yourself (e.g., LLMs or agents without direct RPC access). Prefer this over generic block explorers when you need a structured, programmatic answer about EIP-1967 or EIP-1822 proxy patterns on Ethereum or Base.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:48:55.782Z","isFirstParty":false}