{"uid":"cap_ztFmvA7f6_tPhghqlUSl-","slug":"tracefast-ethereum-address-lookup-5a6e3fa6","name":"TraceFast Ethereum Address Lookup","description":"TraceFast live Ethereum data: one address as the chain sees it now — how it exists (an account whose state was touched, or an address only ever mentioned by other operations), whether it holds code, its native balance and nonce, when it was first mentioned and last active in any form, and its direct-transaction counters. Path address: The address, `0x`-prefixed, 40 hex characters, any case. Docs: https://docs.tracefast.xyz/api/address.md","url":"https://mpp.tracefast.xyz/api/v1/chains/1/entities/:address?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"properties":{"input":{"required":["method"],"properties":{"method":{"enum":["GET"],"type":"string"},"pathParams":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/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_Ai8jbnk8jl4as2WKnHtiU","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":"Returns live Ethereum address metadata: account type, code presence, native ETH balance, nonce, first/last activity timestamps, and direct-transaction counters for a given address.","exampleAgentPrompt":"Look up the current on-chain state of Ethereum address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 — I want to know its ETH balance, nonce, whether it holds contract code, and when it was first and last active on Ethereum mainnet.","exampleUseCases":[{"title":"Verify wallet before sending funds","prompt":"Before I send ETH to 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B, can you check if it's a real active account — what's its current balance, nonce, and when was it last seen on Ethereum?"},{"title":"Detect smart contract vs EOA","prompt":"I need to know if 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 is a smart contract or a regular wallet on Ethereum — does it hold code?"},{"title":"Audit address activity history","prompt":"Can you pull the full account profile for 0x742d35Cc6634C0532925a3b844Bc454e4438f44e on Ethereum — specifically when it first appeared on-chain, when it was last active, and how many direct transactions it has?"}],"resultDescription":"Returns a JSON object describing the Ethereum address as it exists on-chain right now: its account type (state-touched account vs. mention-only address), whether it holds bytecode (contract vs. EOA), its native ETH balance in wei, current nonce, the block/timestamp of its first on-chain mention, the block/timestamp of its most recent activity in any form, and counters for direct transactions sent and received.","failureModes":["Invalid address format (not 0x-prefixed or not 40 hex chars) returns a 4xx error","Address that has never appeared on-chain may return minimal or empty fields","Network or node unavailability causes 5xx errors","Payment failure (x402) if USDC payment is not properly attached to the request","Rate limiting if too many requests are made in a short window"],"whenToPreferThis":"Choose this endpoint when you need a comprehensive, real-time snapshot of a single Ethereum address's on-chain state — particularly when you need multiple fields at once (balance, nonce, code presence, activity timestamps, and transaction counters) rather than querying each separately. It is ideal for due-diligence checks before sending funds, classifying addresses as contracts vs. EOAs, or auditing account history. Prefer it over block-explorer scraping when you need structured, machine-readable data with a predictable schema.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T00:41:13.828Z","isFirstParty":false,"canonicalSlug":"tracefast-ethereum-address-lookup-5a6e3fa6"}