{"uid":"cap_YVOxqp546NrTcwLJ0owIs","slug":"onesource-ethereum-contract-proxy-lookup-b5a47e91","name":"OneSource Ethereum Contract Proxy Lookup","description":"Two data families for AI agents: live Ethereum mainnet, Sepolia testnet, and Robinhood Chain RPC reads, plus Deepstate on-chain market data (order books, trades, candles, and analytics). Pay per call or use batch/session mode: USDC on Base via x402, or pathUSD/USDC.e on Tempo via MPP. No API key required to start; a flat-rate monthly subscription is also available.","url":"https://api.onesource.io/api/chain/proxy/%7Baddress%7D","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"pathParams":{"type":"object","required":["address"],"properties":{"address":{"type":"string","pattern":"^0x[a-fA-F0-9]{40}$"}}},"queryParams":{"type":"object","properties":{"network":{"enum":["ethereum","sepolia","robinhood"],"type":"string","default":"ethereum"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","required":["data","meta"],"properties":{"data":{"type":"object","properties":{"admin":{"type":"string"},"address":{"type":"string"},"is_proxy":{"type":"boolean"},"proxy_type":{"type":"string"},"is_contract":{"type":"boolean"},"implementation":{"type":"string"}},"description":"Endpoint-specific response payload"},"meta":{"type":"object","required":["endpoint","request_id"],"properties":{"endpoint":{"type":"string"},"cost_usdc":{"type":"string"},"request_id":{"type":"string"},"payment_chain":{"type":"string"},"payment_token":{"type":"string"}}},"error":{"type":["object","null"],"properties":{"code":{"type":"integer"},"message":{"type":"string"}}}}}}}}},"responseSchema":{"type":"json","example":{"data":{"admin":"0xd8da6bf26964af9d7eed9e03e53415d37aa96045","address":"0xdac17f958d2ee523a2206206994597c13d831ec7","is_proxy":true,"proxy_type":"eip1967","is_contract":true,"implementation":"0x6b175474e89094c44da98b954eedeac495271d0f"},"meta":{"endpoint":"/api/chain/proxy/{address}","cost_usdc":"0.001","request_id":"00000000abcdef01","payment_chain":"base","payment_token":"USDC"}}},"example":{"request":{"address":"0xdac17f958d2ee523a2206206994597c13d831ec7"},"response":{"data":{"address":"0xdac17f958d2ee523a2206206994597c13d831ec7","is_proxy":true,"proxy_type":"slot0","is_contract":true,"implementation":"0xc6cde7c39eb2f0f0095f41570af89efc2c1ea828"},"meta":{"endpoint":"/api/chain/proxy/0xdac17f958d2ee523a2206206994597c13d831ec7","request_id":"81fb01af9d6e67db"}}},"exampleRequest":{"address":"0xdac17f958d2ee523a2206206994597c13d831ec7"},"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_ykLfgJexYfQZv2o-cVS-m","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":"Looks up Ethereum contract metadata (proxy status, implementation address) for a given contract address on mainnet or Sepolia testnet","exampleAgentPrompt":"Can you check if the Ethereum contract at 0xdac17f958d2ee523a2206206994597c13d831ec7 is a proxy contract, and if so, what implementation address it points to — use Ethereum mainnet?","exampleUseCases":null,"resultDescription":"Returns JSON with the queried address, whether it is a proxy contract (is_proxy boolean), the proxy pattern used (if any), and the implementation contract address it delegates to (if applicable).","failureModes":["Invalid address format (not a valid 0x-prefixed 40-hex-char address) returns an error","Address is an EOA (externally owned account) rather than a contract — may return is_proxy false with nulls","Payment not provided or insufficient USDC — returns 402 Payment Required","Network value not in allowed enum (ethereum, sepolia) causes validation error","Contract exists but proxy detection is inconclusive — pattern and implementation may be null"],"whenToPreferThis":"Use this endpoint when you need to determine if a specific Ethereum contract is a proxy and find its underlying implementation — particularly useful before calling or auditing a contract. Prefer this over generic Etherscan lookups when you want programmatic, pay-per-call access without API keys, or when building autonomous AI agent workflows that need live on-chain contract introspection on mainnet or Sepolia.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:30:02.816Z","isFirstParty":false}