{"uid":"cap_Cn4zP_DbMAFfkLegABZ0L","slug":"evm-wallet-nonce-lookup-88622da5","name":"EVM Wallet Nonce Lookup","description":"Confirmed and pending nonce of a wallet, next nonce to use and transactions waiting in the mempool. Works on Base, Ethereum, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, Gnosis, Linea, Scroll, Sonic and Unichain.","url":"https://api.vextorium.com/evm-nonce-pago?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"red":{"enum":["base","ethereum","arbitrum","optimism","polygon","bnb","avalanche","gnosis","linea","scroll","sonic","unichain"],"type":"string","description":"Chain (default base)"},"direccion":{"type":"string"}}},"responseSchema":{"type":"json","example":{"red":"base","wallet":"0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf","nonce_pendiente":1,"siguiente_nonce":1,"nonce_confirmado":1,"transacciones_en_espera":0}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_tpNRady18LnHirSVvbKOc","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the confirmed nonce, pending nonce, next nonce to use, and number of transactions waiting in the mempool for a given wallet address across 12 EVM chains.","exampleAgentPrompt":"What is the current confirmed nonce, pending nonce, and next nonce to use for wallet 0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf on Base, and are there any transactions waiting in the mempool?","exampleUseCases":[{"title":"Detecting stuck mempool transactions","prompt":"Check if wallet 0xAbC1234...5678 has any transactions stuck in the mempool on Arbitrum and tell me the current confirmed vs pending nonce so I know if something is queued up."},{"title":"Finding next safe nonce before sending a tx","prompt":"I'm about to send a transaction from 0xDead...Beef on Polygon — what nonce should I use to make sure it doesn't collide with anything already pending?"},{"title":"Monitoring wallet activity across chains","prompt":"Tell me the confirmed and pending nonce for 0x1234...abcd on Optimism so I can see whether any unconfirmed transactions are still in flight."}],"resultDescription":"A JSON object containing the chain name, wallet address, confirmed nonce (nonce_confirmado), pending nonce (nonce_pendiente), the next recommended nonce to use (siguiente_nonce), and the count of transactions currently waiting in the mempool (transacciones_en_espera).","failureModes":["Invalid or malformed wallet address returns an error","Unsupported chain value causes a validation error (must be one of: base, ethereum, arbitrum, optimism, polygon, bnb, avalanche, gnosis, linea, scroll, sonic, unichain)","Missing required 'direccion' field in body returns a schema validation error","Network timeout or RPC node unavailability may result in a service error","Payment failure (insufficient USDC balance) blocks the request under the x402 protocol"],"whenToPreferThis":"Use this endpoint when you need real-time nonce state for a specific wallet on any of the 12 supported EVM chains — particularly when managing transaction sequencing, detecting stuck/pending transactions, or determining the correct nonce before submitting a new transaction. Prefer this over block explorer APIs when you need a unified multi-chain interface with mempool visibility in a single call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T00:28:34.699Z","isFirstParty":false,"canonicalSlug":"evm-wallet-nonce-lookup-88622da5"}