{"uid":"cap_K0EyDbJxNfKpieYHm_aHv","slug":"plainchain-address-lookup-d897d0c4","name":"Plainchain Address Lookup","description":"Gas, balances, token data, address type, approvals, transaction decoding, x402 receipt verification and verifiable randomness on Base, Arbitrum, Ethereum and Optimism. No API key: pay $0.001-$0.01 per call in USDC on Base via x402.","url":"https://plainchain.appin60.com/v1/address?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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":["address"],"properties":{"chain":{"type":"string","description":"base (default), arbitrum, ethereum or optimism; chain ids 8453, 42161, 1, 10 also work"},"address":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$","description":"any address"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"type":"contract","chain":"Base","erc20":{"symbol":"USDC","decimals":6},"proxy":{"admin":"0x3abd...","standard":"EIP-1967","implementation":"0x2ce6..."},"address":"0x8335...","summary":"ERC-20 token USDC; upgradeable proxy (EIP-1967) -> 0x2ce6..."}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001942","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":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001942/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001942","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001942","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_asTeK9GLYQsPpl_wLjrAP","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001942","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns address type classification, ERC-20 token metadata, proxy details, and a human-readable summary for any EVM address on Base, Arbitrum, Ethereum, or Optimism","exampleAgentPrompt":"Can you tell me what's deployed at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base — is it a contract, what token is it, and is it a proxy?","exampleUseCases":[{"title":"Identify unknown contract before interaction","prompt":"Before I approve this contract to spend my tokens, can you tell me what 0x2626664c2603336E57B271c5C0b26F421741e481 is on Arbitrum — is it a contract, is it a proxy, what does it do?"},{"title":"Fetch token decimals for DeFi calculation","prompt":"I need to know the symbol and decimals for the token contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum so I can format the amounts correctly."},{"title":"Audit proxy implementation address","prompt":"What is the current implementation contract behind the upgradeable proxy at 0x4200000000000000000000000000000000000006 on Optimism, and which proxy standard does it use?"}],"resultDescription":"A JSON object containing the address string, chain name, address type (e.g. 'contract' or 'EOA'), ERC-20 metadata (symbol and decimals if applicable), proxy details (standard like EIP-1967, admin address, implementation address if applicable), and a plain-English summary sentence describing what the address is.","failureModes":["Invalid address format (not matching ^0x[0-9a-fA-F]{40}$) returns an error","Unsupported chain identifier returns an error","Address is valid but has no on-chain data (e.g. undeployed contract) — type returned as EOA or empty","Network congestion or RPC failures may cause transient errors","Payment failure via x402 if insufficient USDC balance on Base"],"whenToPreferThis":"Choose this endpoint when you need a quick, structured classification of any EVM address — whether it's an EOA, a token contract, or an upgradeable proxy — across Base, Arbitrum, Ethereum, and Optimism, without needing an API key. It is ideal for agents that need to enrich address metadata on the fly and can pay micro-fees in USDC via x402. Prefer alternatives if you need deep historical data, transaction history, or non-EVM chains.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-14T12:42:58.315Z","isFirstParty":false,"canonicalSlug":"plainchain-address-lookup-d897d0c4"}