{"uid":"cap_cxnpOlopHHyyp9YcyJLbW","slug":"foundry-base-address-info-ae65143b","name":"Foundry Base Address Info","description":"Base address lookup from the chain: wallet (EOA) or contract, bytecode size, ETH balance, USDC balance and number of transactions sent. Useful before sending funds or paying an address. Input: 0x address. Deterministic, no LLM.","url":"https://minty-sprout.onrender.com/v1/base-address-info?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"input":{"type":"string","maxLength":8000,"description":"Base wallet or contract address, 0x + 40 hex characters"}}},"responseSchema":{"type":"json","example":{"kind":"wallet (EOA)","address":"0x11DCED0487cA3E7d9032029DCb302253ccF4e0DE","network":"eip155:8453","code_size":0,"eth_balance":0,"usdc_balance":0.053,"transactions_sent":0}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_kG9VOA7v-UvOaYhwuVReZ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Looks up on-chain facts for a Base network address: wallet vs contract classification, bytecode size, ETH balance, USDC balance, and transaction count.","exampleAgentPrompt":"Before I send 50 USDC, can you check if 0x11DCED0487cA3E7d9032029DCb302253ccF4e0DE is a wallet or a contract on Base, and tell me its current ETH and USDC balances and how many transactions it's sent?","exampleUseCases":[{"title":"Pre-payment address due diligence","prompt":"I'm about to pay 0xAbCd1234...EfGh5678 on Base — can you check whether it's a real wallet or a contract, and what its ETH and USDC balances and transaction history look like before I send anything?"},{"title":"Detecting a smart contract vs EOA","prompt":"Is 0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD on Base a smart contract or a regular wallet? I need to know the bytecode size and how many transactions it's sent."},{"title":"Auditing a suspicious recipient address","prompt":"Someone just sent me a payment request from 0xDEAD000000000000000000000000000000000000 on Base — can you pull its on-chain info so I can see if it looks legit? I want to see the balances and whether it's ever sent any transactions."}],"resultDescription":"Returns a JSON object with: address kind ('wallet (EOA)' or 'contract'), the queried address, network identifier ('eip155:8453' for Base), code_size (bytes of bytecode, 0 for EOAs), eth_balance (in ETH), usdc_balance (in USDC), and transactions_sent (nonce / outbound tx count).","failureModes":["Invalid or malformed 0x address returns an error","Address not found or zero activity returns zeros for all balances and transaction count","Network or RPC node unavailable causes a timeout or 5xx error","Address input exceeds 42 characters or contains non-hex characters causes validation failure","Payment failure (x402) if USDC not provided blocks the request"],"whenToPreferThis":"Use this endpoint when you need a quick, deterministic, no-LLM on-chain snapshot of any Base network address before sending funds or interacting with it. It is the right choice when you need to distinguish wallets from contracts, check balances, or assess activity level on Base (eip155:8453) specifically. Prefer alternatives if you need Ethereum mainnet or other chains, or need deeper contract analysis beyond bytecode size.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-01T06:57:41.078Z","isFirstParty":false,"canonicalSlug":"foundry-base-address-info-ae65143b"}