{"uid":"cap_m2hzPE82-L1y4EHWOqTZ9","slug":"evm-nonce-lookup-optimism-92c8b7dc","name":"EVM Nonce Lookup (Optimism)","description":"EVM Nonce (optimism). Optimism account nonce: confirmed and pending transaction count for any address.","url":"https://saylorinnovations.com/api/evm/optimism/nonce/:address?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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__EkOXemfcrCS3X6Ez372B","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the current transaction nonce for a given wallet address on the Optimism EVM network","exampleAgentPrompt":"What's the current nonce for wallet address 0xAbC123...def on Optimism? I need it before I build and sign my next transaction.","exampleUseCases":[{"title":"Transaction sequencing for wallet agent","prompt":"I'm about to send a transaction from 0x4f3edf983ac636a65a842ce7c78d9aa706d3b113 on Optimism — what's the current nonce so I can set it correctly in the signed payload?"},{"title":"Detecting stuck or pending transactions","prompt":"Check the on-chain nonce for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Optimism and compare it to what my local wallet says — I think there may be a stuck pending transaction."},{"title":"Auditing wallet activity level","prompt":"How many transactions has the address 0x1234567890abcdef1234567890abcdef12345678 ever sent on the Optimism network? I want to gauge how active this wallet is."}],"resultDescription":"Returns the current nonce (transaction count) for the specified address on the Optimism network — an integer representing how many transactions that address has sent, usable directly as the nonce value for the next transaction.","failureModes":["Invalid or malformed Ethereum address returns an error","Address with no transaction history returns nonce of 0 (not an error)","Network connectivity issues to Optimism RPC node may return a timeout or 5xx error","Non-checksummed address may be rejected depending on validation strictness"],"whenToPreferThis":"Use this endpoint when you need the current on-chain nonce specifically for an address on the Optimism L2 network. Prefer it over general RPC calls when you want a simple, pay-per-use REST interface without managing your own Optimism node or RPC provider subscription. Choose the Optimism-specific endpoint (rather than Base or BSC siblings) when the transaction you're building targets the Optimism chain.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-03T00:48:46.228Z","isFirstParty":false,"canonicalSlug":"evm-nonce-lookup-optimism-92c8b7dc"}