{"uid":"cap_Uq6MIEHJPedryVYhFOO2t","slug":"ethereum-wallet-nonce-lookup-206ff99e","name":"Ethereum Wallet Nonce Lookup","description":"Read the transaction count (nonce) of a 0x address on Ethereum, both confirmed and including pending transactions. Use to build the next transaction or to tell whether an address has ever sent anything; for its balance use eth_balance. A malformed address is rejected with 400, uncharged.","url":"https://agent-data-tools.revmesh2074.workers.dev/eth/nonce?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","required":["address"],"properties":{"address":{"type":"string","description":"0x address"}}},"responseSchema":{"type":"object","properties":{"chain":{"type":"string"},"nonce":{"type":"number"},"address":{"type":"string"},"chainId":{"type":"number"},"hasSent":{"type":"boolean"},"pendingNonce":{"type":"number"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USD","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_KBU-Lr1jz72YW9lDkl9dI","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the current confirmed and pending transaction nonce for an Ethereum address, plus whether the address has ever sent a transaction.","exampleAgentPrompt":"What's the current nonce for the Ethereum wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045? I need to know if it's ever sent transactions and what the pending nonce is.","exampleUseCases":[{"title":"Pre-transaction nonce check","prompt":"Before I broadcast this Ethereum transaction, can you check the current confirmed and pending nonce for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 so I know the right sequence number to use?"},{"title":"Wallet activity verification","prompt":"Has the Ethereum address 0xAbCd1234567890abcdef1234567890ABCDEF1234 ever sent any transactions? What's its current nonce?"},{"title":"Stuck transaction diagnosis","prompt":"I think I have a stuck transaction. Can you pull the confirmed nonce and the pending nonce for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum so I can see if there's a gap?"}],"resultDescription":"A JSON object with the wallet address, the confirmed transaction nonce, the pending nonce (including mempool), a boolean indicating whether the address has ever sent a transaction, the chain name (Ethereum), and the chain ID (1).","failureModes":["Invalid or malformed 0x address returns an error response","Address with no on-chain history may return nonce 0 and hasSent false","Network or RPC node outage may cause a timeout or 5xx error","Missing required 'address' query parameter returns a validation error"],"whenToPreferThis":"Choose this endpoint when you need to read the Ethereum mainnet transaction nonce for a wallet, especially before constructing or troubleshooting transactions. It is pay-per-call with no API key required, making it ideal for ad-hoc agent workflows. Use sibling endpoints for other chains (Base, Arbitrum, Optimism, Polygon) if those networks are needed.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-28T12:39:09.992Z","isFirstParty":false,"canonicalSlug":"ethereum-wallet-nonce-lookup-206ff99e"}