{"uid":"cap_kSS6Ykr8XRQoWcGpziWFg","slug":"base-nonce-replacement-analyzer-4aeed8bb","name":"Base Nonce Replacement Analyzer","description":"Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.","url":"https://signalharness.ai/api/agent/services/base_nonce_replacement_analyze/invoke","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"request_json":{"type":"string","maxLength":65536,"minLength":2}}},"responseSchema":{"type":"json","example":{"replay":false,"result":{"warnings":["Canonical replacement status requires chain evidence not inferred here."],"service_id":"base_nonce_replacement_analyze","analysis_json":"{\"network_context\":{\"accepted_chain_ids\":[\"8453\",\"84532\"],\"deposit_transaction_type\":\"0x7e\",\"fee_model\":\"L2 execution plus caller-supplied L1 data/operator components\",\"protocol_family\":\"OP Stack\"},\"nonce_gaps\":[],\"replacement_groups\":[],\"transactions\":[{\"from\":\"0x0000000000000000000000000000000000000001\",\"hash\":\"0x1111111111111111111111111111111111111111111111111111111111111111\",\"index\":0,\"max_fee_per_gas\":\"120\",\"nonce\":\"1\"}]}","evidence_scope":"caller_supplied_data","analyzed_network":"base"},"status":"succeeded","receipt":{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","usage":[],"status":"succeeded","network":"eip155:8453","artifacts":[],"endedAtMs":0,"latencyMs":0,"paymentId":"example-payment","receiptId":"example-receipt","requestId":"example-request","serviceId":"base_nonce_replacement_analyze","executionId":"example-execution","startedAtMs":0,"amountAtomic":"15000","resultSha256":"8c7f4d7e9f511cec78ba553c86dbbbdb04e2f6e9886e7054271c663940a52c1f","serviceVersion":"1.0.0","settlementReference":"0x0000000000000000000000000000000000000000000000000000000000000000"},"artifacts":[],"requestId":"example-request","executionId":"example-execution"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.015","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":"$0.015/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.015","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.015","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_93GTGD2OzD8By_-_nQo4-","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.015","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Analyzes a set of Base (OP Stack) transactions to detect nonce gaps, replacement groups, and sequencing anomalies from caller-supplied transaction data.","exampleAgentPrompt":"Can you analyze these Base mainnet transactions for nonce gaps and replacement groups? Here's the JSON: [{\"from\":\"0xAbC...\",\"hash\":\"0x111...\",\"index\":0,\"nonce\":\"5\",\"max_fee_per_gas\":\"120\"}]","exampleUseCases":[{"title":"Debugging stuck wallet transactions","prompt":"I submitted several transactions from my wallet on Base and some seem stuck or dropped — can you analyze this transaction list for nonce gaps or replacements so I know what went wrong?"},{"title":"Gas bump replacement detection","prompt":"I bumped the gas on a slow transaction and now I'm not sure if the original or the replacement confirmed — analyze these two Base transactions with the same nonce and tell me if one replaced the other."},{"title":"Bot transaction sequencing audit","prompt":"My trading bot sent a batch of 15 transactions on Base and I need to know if any were out of order or replaced mid-sequence — here's the full transaction JSON for analysis."}],"resultDescription":"Returns a structured analysis JSON containing detected nonce gaps, replacement transaction groups, per-transaction metadata (hash, nonce, from address, gas params), the inferred network context (chain IDs, fee model, protocol family), an evidence scope label, any warnings about limitations, and a service receipt with payment confirmation details.","failureModes":["Malformed or non-JSON request_json causes validation failure","Missing required transaction fields (hash, nonce, from) results in incomplete analysis","Canonical replacement status cannot be confirmed without on-chain evidence — analysis is limited to caller-supplied data","Very large transaction sets may hit the 65536-character input limit","Chain IDs outside Base (8453) or Base Sepolia (84532) may produce unexpected results"],"whenToPreferThis":"Choose this endpoint when you need to programmatically analyze a set of Base L2 (OP Stack) transactions for nonce sequencing issues, replacement patterns, or gaps — especially when debugging stuck or dropped transactions from wallets or bots. It is well-suited for agent workflows that already have raw transaction metadata and need structured classification without making direct RPC calls. Prefer alternatives that query live chain state if canonical confirmation of replacement is required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:41:18.945Z","isFirstParty":false}