{"uid":"cap_Od-WiE2Wewy7Jl5RYZyto","slug":"skills-onesource-io-0a918a11","name":"Ethereum Wallet Transaction Nonce Lookup","description":"Next transaction nonce for any Ethereum wallet via eth_getTransactionCount - how many txs it has sent","url":"https://skills.onesource.io/api/chain/nonce/:address","method":"GET","headers":{},"bodySchema":null,"responseSchema":null,"example":{"request":{"block":"latest","address":"0x1234567890123456789012345678901234567890","network":"ethereum"},"response":{"data":{"nonce":"0x0"},"meta":{"endpoint":"/api/chain/nonce/0x1234567890123456789012345678901234567890","request_id":"033c36ddc19cda01"}}},"exampleRequest":{"block":"latest","address":"0x1234567890123456789012345678901234567890","network":"ethereum"},"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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_bmEYLmnzGvXk7YfFo1xXD","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 next transaction nonce (eth_getTransactionCount) for any Ethereum-compatible wallet address at a given block","exampleAgentPrompt":"What's the current nonce for Ethereum wallet 0x1234567890123456789012345678901234567890 on mainnet at the latest block — how many transactions has it sent so far?","exampleUseCases":null,"resultDescription":"Returns a hex-encoded nonce value (e.g. '0x1a') representing how many transactions the wallet has sent, plus endpoint and request ID metadata. The nonce indicates the next sequence number to use for a new transaction from that address.","failureModes":["Invalid address format (not a 40-char hex with 0x prefix) returns a validation error","Unsupported network name returns an error (must be one of: ethereum, sepolia, avax, megaeth, megaeth-testnet, base)","Invalid block tag or number returns an RPC error","Address with no transaction history returns nonce 0x0","RPC node unavailability may cause timeout or 5xx response","Payment failure (402) if USDC balance is insufficient"],"whenToPreferThis":"Use this endpoint when you need the transaction nonce for an Ethereum-compatible wallet address, especially when constructing or broadcasting transactions, auditing wallet activity, or checking how many transactions an address has sent. Prefer this over raw RPC calls when you want a managed, pay-per-use API with multi-network support including Base, Avalanche, and testnets.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:31:06.016Z","isFirstParty":false}