{"uid":"cap_N4VL0DrcDDnFqm1d2fVzy","slug":"chainread-nonce-lookup-40a18d77","name":"ChainRead Nonce Lookup","description":"Pay-per-call HTTP APIs, paid with x402 in USDC on Base (eip155:8453): agentkit, api-change-check, basedue, basewatch, chainread, check-sanctions, chgwatch, company-facts, composite, edgar, feednews, pageaudit, solcheck, token-dd, txpreflight, walletcheck, webmd, webread, websearch, x402index. Each operation describes its service.","url":"https://api.firstmention.uk/s/chainread/nonce?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"hash":{"type":"string","description":"0x transaction hash (for /tx)"},"chain":{"enum":["base","ethereum"],"type":"string"},"number":{"type":"string","description":"Block number or 'latest' (for /block)"},"address":{"type":"string","description":"0x address or ERC-20 contract address"},"addresses":{"type":"array","items":{"type":"string"},"description":"Up to 25 addresses (for /batch)"}}},"responseSchema":{"type":"json","example":{"risk":"medium","_meta":{"payer":"0x...","price_usd":0.01},"chain":"base","flags":[{"code":"owner_holds_power","severity":"high"}],"score":45,"address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","verdict":"CAUTION"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/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_huECIEoVryKPSKt1sA9QR","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":"Retrieves the nonce (transaction count) for a blockchain address on Base or Ethereum, useful for transaction sequencing and wallet analysis.","exampleAgentPrompt":"What is the current nonce for the address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base — and does it show any risk flags?","exampleUseCases":[{"title":"Pre-transaction nonce check","prompt":"Before I send a transaction from 0x1234abcd...5678 on Base, can you grab the current nonce for that address so I know what sequence number to use?"},{"title":"Wallet activity risk assessment","prompt":"Can you check the nonce and risk profile for 0xABC123...DEF456 on Ethereum — I want to know how active this wallet is and if there are any red flags before I interact with it?"},{"title":"Smart contract nonce audit","prompt":"Pull the on-chain nonce for the contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base and tell me the verdict and any risk flags you see."}],"resultDescription":"Returns a JSON object containing the blockchain address, chain, nonce-derived risk score (0-100), a verdict (e.g. CAUTION, SAFE, RISKY), an array of flags with severity levels (e.g. owner_holds_power: high), and metadata including the payer address and price paid in USD.","failureModes":["Invalid or malformed 0x address returns an error","Unsupported chain value (not 'base' or 'ethereum') returns a validation error","Payment failure via x402/USDC results in 402 Payment Required","Network or RPC node unavailability causes timeout or 503","Address with no on-chain history may return minimal data or zero nonce"],"whenToPreferThis":"Use this endpoint when you need on-chain nonce data for an address on Base or Ethereum, especially when combined with risk scoring and flagging. Prefer it over raw RPC calls when you want structured risk metadata alongside the nonce, or when building agents that need pay-per-call blockchain reads without managing infrastructure. Best for AI agents that need transaction sequencing data plus compliance-grade risk context in a single call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T12:43:36.434Z","isFirstParty":false,"canonicalSlug":"chainread-nonce-lookup-40a18d77"}